СИСТЕМА НЕЙТРАЛИЗАЦИИ ВРЕДНЫХ ВЫБРОСОВ ДЛЯ ТРАНСПОРТНЫХ СРЕДСТВ С БЕНЗИНОВЫМИ ДВИГАТЕЛЯМИ

... 1. Система нейтрализации отработавших газов для бензиновых двигателей, содержащая расположенный вблизи двигателя трехкомпонентный каталитический нейтрализатор (ТКН) отработавших газов и расположенный за ним по потоку отработавших газов каталитический фильтр твердых частиц для бензиновых двигателей (ФТЧ-БД), имеющий проницаемые стенки, причем количество металлов платиновой группы в ТКН по меньшей мере в пять раз превышает количество металлов платиновой группы в ФТЧ-БД.2. Система по п. 1, в которой оба нейтрализующих отработавшие газы устройства содержат в качестве металлов платиновой группы палладий и родий.3. Система по п. 1 или 2, в которой расположенный первым по потоку отработавших газов ТКН находится на расстоянии примерно от 5 до 30 см от выпускного отверстия двигателя, выходного отверстия выпускного коллектора или турбонагнетателя по потоку отработавших газов.4. Система по п. 1 или 2, в которой расположенный вторым по потоку отработавших газов ФТЧ-БД находится на расстоянии примерно ...

КАТАЛИТИЧЕСКИЕ ИЗДЕЛИЯ

Предложено каталитическое изделие для применения для обработки выхлопа двигателя внутреннего сгорания (варианты), где один из вариантов содержит подложку, имеющую каталитическое покрытие на ней, причем каталитическое покрытие содержит каталитический слой, где каталитический слой содержит компонент благородного металла на частицах носителя, и где частицы носителя имеют бимодальное распределение частиц по размеру, содержащее частицы микронного масштаба и частицы наномасштаба, где частицы микронного масштаба имеют средний размер частиц ≥ 1 микрон, и частицы наномасштаба имеют средний размер частиц ≤ 950 нм, благородный металл представляет собой палладий или платину, и каталитический слой содержит оксид церия, оксид алюминия и оксид циркония. Также предложена система для обработки выхлопного газа и способ обработки выхлопного газа двигателя внутреннего сгорания, которые содержат каталитическое изделие один из вариантов, который описан выше. Кроме того, предложен способ получения каталитического ...

ФИЛЬТР ДЛЯ ОЧИСТКИ ВЫХЛОПНОГО ГАЗА

ПОРОШКООБРАЗНЫЙ ОКСИД ТИТАНА, СПОСОБЫ ЕГО ПОЛУЧЕНИЯ И ЕГО ПРИМЕНЕНИЕ

АЛЮМОСИЛИКАТНОЕ ИЛИ СИЛИКОАЛЮМОФОСФАТНОЕ МОЛЕКУЛЯРНОЕ СИТО/ОКТАЭДРИЧЕСКОЕ МОЛЕКУЛЯРНОЕ СИТО НА ОСНОВЕ МАРГАНЦА В КАЧЕСТВЕ КАТАЛИЗАТОРОВ ДЛЯ ОБРАБОТКИ ВЫХЛОПНЫХ ГАЗОВ

ПОДЛОЖКА КАТАЛИЗАТОРА ИЗ ОКСИДА АЛЮМИНИЯ

... 1. Пористый оксид алюминия с высокой удельной поверхностью и с высоким объемом пор, содержащий:оксид алюминия,необязательно, оксид кремния и алюмосиликаты, инеобязательно, одну или более легирующих добавок,причем указанный оксид алюминия имеет удельную площадь поверхности от примерно 100 до примерно 500 м2/г и общий объем пор после обжига при 900°C в течение 2 часов равный или больший 1,2 см3/г, причем 15% или менее от общего объема пор составляют поры, имеющие диаметр менее 10 нанометров.2. Оксид алюминия по п.1, отличающийся тем, что указанный оксид алюминия имеет после обжига при 900°C в течение 2 часов общий объем пор, больший или равный 1,25 см3/г3. Оксид алюминия по п.1, отличающийся тем, что, после обжига при 900°C в течение 2 часов, 10% или менее от общего объема пор в указанном оксиде алюминия составляют поры, имеющие диаметр менее 10 нанометров.4. Оксид алюминия по п.1, отличающийся тем, что, после обжига при 900°C в течение 2 часов, 50% или менее от общего объема пор в указанном ...

Catalyst useful in automotive exhaust catalysis, comprises a porous covering based on at least one metal oxide, and metal particles, which are present in the pores of the covering

Catalyst comprises a porous covering based on at least one metal oxide, and metal particles, which are present in the pores of the covering. An independent claim is also included for preparing the catalyst, comprising producing the covering on a template, removing the template from the covering, and placing the metal particles in the pores of the covering.

Process for producing a catalyst and catalyst article

Filter

Exhaust system

An exhaust system 2 comprising a lean NOx trap 4 and a wall flow monolithic substrate having a pre-coated porosity of ≥ 40%, the substrate comprising an oxidation catalyst zone 6 comprising a PGM on a first support, the first support comprising at least one inorganic oxide and a zinc compound. The first support may comprise alumina and ceria-zirconia mixed and the zinc compound is preferably zinc oxide. The PGM may be selected from platinum, palladium, rhodium and a mixture thereof such as Pt:Pd with a weight ratio from1:1 to 6:1. In an embodiment, the exhaust system (Fig 2; 13) may further comprise a selective catalytic reduction (SCR) zone (Fig 2; 17) (comprising copper or iron loaded on a second support such as a zeolite. Preferably the oxidation zone (Fig 2; 16) is on a first wall flow monolith and the SCR zone (Fig 2; 17) is on a second monolithic substrate. Further aspects relate to a catalytic wall flow monolithic substrate and a method of making the catalysed monolithic wall flow ...

Dirt separator for a vacuum cleaner

Catalyst and method for preparing a catalyst

Exhaust system

TEXTURIERTE CLEANING STRUCTURE WITH AN ELECTRO-CHEMICAL CATALYST SYSTEM

Formed catalyst body

Porous bodies and methods

Binary catalyst based selective catalytic reduction filter

Catalytic cores for a wall-flow filter include juxtaposed channels extending longitudinally between an inlet side and an outlet side of the core, wherein the inlet channels are plugged at the outlet side and outlet channels are plugged at the inlet side. Longitudinal walls forming the inlet and outlet channels separate the inlet channels from the outlet channels. The walls include pores that create passages extending across a width of the walls from the inlet channels to the outlet channels. Catalysts are distributed across the width and length of the walls within internal surfaces of the pores in a manner such that the loading of each catalyst across the width varies by less than 50% from an average loading across the width.

COPPER AND IRON CO-EXCHANGED CHABAZITE CATALYST

The present disclosure generally provides catalysts, catalytic articles and catalyst systems comprising such catalytic articles. In particular, the catalyst composition comprises a zeolite having a chabazite (CHA) crystal structure ion-exchanged with iron and copper. Methods of making and using the catalyst composition are also provided, as well as emission treatment systems comprising a catalyst article coated with the catalyst composition. The catalyst article present in such emission treatment systems is useful to catalyze the reduction of nitrogen oxides in gas exhaust in the presence of a reductant.

BINARY CATALYST BASED SELECTIVE CATALYTIC REDUCTION FILTER

Catalytic cores for a wall-flow filter include juxtaposed channels extending longitudinally between an inlet side and an outlet side of the core, wherein the inlet channels are plugged at the outlet side and outlet channels are plugged at the inlet side. Longitudinal walls forming the inlet and outlet channels separate the inlet channels from the outlet channels. The walls include pores that create passages extending across a width of the walls from the inlet channels to the outlet channels. Catalysts are distributed across the width and length of the walls within internal surfaces of the pores in a manner such that the loading of each catalyst across the width varies by less than 50% from an average loading across the width.

SULFUR TOLERANT ALUMINA CATALYST SUPPORT

The present invention is directed to an improved catalyst support and to the resultant catalyst suitable for treating exhaust products from internal combustion engines, especially diesel engines. The support of the present invention is a structure comprising alumina core particulate having high porosity and surface area, wherein the structure has from about 1 to about 8 weight percent silica in the form of cladding on the surface area of said alumina core. The resultant support has a sulfur tolerance efficiency (.eta.) of at least 1000 µg/m2.

ALKALI RESISTANT CATALYST

The present invention concerns the selective removal of nitrogen oxides ( NOx) from gasses. In particular, the invention concerns a process, a catalys t and the use of a catalyst for the selective removal of nitrogen oxides in the presence of ammonia from gases containing a significant amount of alkali metal and/or alkali-earth compounds which process comprises using a catalys t combined of (i) a formed porous superacidic support, said superacidic supp ort having an Hammett acidity stronger than Ho=-12, and (ii) a metal oxide c atalytic component deposited on said superacidic support selected from the g roup consisting of oxides of Fe, Cu, V, Cr, Mn, and any mixtures thereof. ...

CATALYST AND METHOD OF MANUFACTURE

A catalyst system comprising a first catalytic composition comprising, (i) a first component comprising a zeolite, and (ii) a second component comprising a homogeneous solid mixture containing at least one catalytic metal and at least one metal inorganic network; wherein the pores of the solid mixture have an average diameter in a range of about 1 nanometer to about 15 nanometers; wherein the first component and the second component form an intimate mixture. The catalyst system may further comprise a second catalytic composition and a third catalytic composition. The catalyst system may further comprise a delivery system configured to deliver a reductant and optionally a co-reductant. An exhaust system comprising the catalyst systems described herein is also provided.

SCR CATALYTIC CONVERTER HAVING IMPROVED HYDROCARBON RESISTANCE

The invention relates to a catalytic converter for the selective catalytic reduction of nitrogen oxides in diesel engine exhaust gases using ammonia or a precursor compound that can be decomposed to form ammonia as a reductant. The catalytic converter contains two coatings, which are applied to a substrate body and which lie one over the other, of which the first coating, which is applied directly to the substrate body, contains a transition-metal-exchanged zeolite and/or a transition-metal-exchanged zeolite-like compound and actively catalyzes the SCR reaction. The second coating is applied to the first coating in such a way that the second coating covers the first coating on the exhaust gas side. The second coating is such that the second coating prevents hydrocarbons present in the exhaust gas and having at least three C atoms from contacting the layer lying thereunder, without blocking the passage of nitrogen oxides and ammonia to the first coating. The second coating can be made of ...

METHOD FOR MAKING POROUS ACICULAR MULLITE BODIES

Highly porous acicular mullite bodies are prepared. A green body containing mullite precursors and a porogen is formed using a wet method. The green body is heated to sequentially remove any binder, the porogen and calcine it. The calcined body is mullitized. The process formed a calcined body that has excellent strength and can be handled easily. The mullitized body has very high porosity, small pores and has excellent fracture strength.

COMPOSITION CATALYTIQUE, PROCEDE POUR SA PREPARATION, ET UTILISATION DE CETTE COMPOSITION CATALYTIQUE.

STRUCTURED DEVICE OF CLEANING, WHICH INCLUDES THE SYSTEM OF THE ELECTROCHEMICAL CATALYSIS

ОЧИСТИТЕЛЬНОЕ УСТРОЙСТВО

Изобретение относится к очистительному устройству для обработки текучей среды. Изобретение относится также к способу изготовления и применения указанного очистительного устройства. Очистительное устройство содержит перфорированную структуру (4), устанавливаемую во входной трубе (2) и/или выходной трубе (3) для прохождения потока (1, 7), вокруг которых расположена по меньшей мере одна сетчатая структура (5), образующая открытый канал, представляющий собой спиралевидный проточный канал, содержащая по меньшей мере две сетки, между которыми и через которые предусмотрено протекание потока (1, 7) текучей среды в проточных каналах, при этом в перфорированной структуре (4) предусмотрен один или более блокирующих элементов (6, 9), выполненных с возможностью регулирования потока (1, 7) текучей среды через перфорированную структуру (4) в сетчатую структуру (5) и/или в обратном направлении.

Porous catalyst washcoats

Composition containing oxides of zirconium, cerium and at least one other rare earth and having a specific porosity, method for preparing same and use thereof in catalysis

The invention relates to a composition that contains zirconium oxide, cerium oxide and yttrium oxide, or zirconium oxide, cerium oxide and at least two oxides of two rare earths different from cerium in a mass proportion of at least 20 % of zirconium oxide and of at most 70 % of cerium oxide, characterized in that said composition comprises, after calcination at 900 DEG C for 4 hours, two populations of pores having respective diameters centered, for the first population, about a value of between 20 and 40 nm and, for the second, about a value of between 80 and 200 nm. The composition can be used for processing exhaust gases of internal combustion engines.

STRUCTURE OF PURIFICATION TEXTUREE INCORPORATING AN ELECTROCHEMICAL SYSTEM OF CATALYSIS

Structure pour la purification d'un gaz pollué comprenant une matrice poreuse d'un matériau inorganique, sous la forme de grains reliés les uns aux autres et un système électrochimique de traitement dudit gaz constitué par un catalyseur A de réduction des espèces polluantes du type NOx, un catalyseur B d'oxydation des espèces polluantes du type hydrocarbures HC ou CO, un composé C conducteur électronique,un composé D conducteur ionique, ladite structure étant caractérisée en ce que les catalyseurs A et B sont disposés dans la porosité du matériau inorganique, en ce que les grains et éventuellement les joints de grains du matériau inorganique constituant la matrice sont recouverts sur au moins une partie de leur surface d'un matériau de texturation et en ce que ledit matériau de texturation est conducteur ionique, électronique ou ionique et électronique et constitue respectivement l'élément C, l'élément D ou les éléments C et D du système électrochimique de traitement des gaz.

CATALYTIC COMPOSITIONS THEIR PRODUCTION AND THEIR USE

A CATALYST COMPOSITION USEFUL IN THE CATALYTIC REDUCTION OF SULFUR COMPOUND CONTAINED IN A GAS STREAM AND A METHOD OF MAKING AND USING SUCH COMPOSITION

Disclosed is a composition useful in the hydrolysis of sulfur compounds that are contained in a gas stream. The composition comprises alumina, a group VI metal component and a group VIII metal component. The composition has a pore structure such that a large percentage of its total pore volume is contained within the pores having a pore diameter greater than 10,000 angstroms. COPYRIGHT KIPO & WIPO 2010 ...

PLATINUM GROUP METAL (PGM) CATALYST FOR TREATING EXHAUST GAS

METHOD AND CATALYST FOR REMOVAL OF NITROGEN OXIDES IN A FLUE GAS

processo destinado Á produÇço de um pà catalisador, processo destinado Á produÇço de um conversor catalitico e processo destinado Á produÇço de um conversor catalÍtico nox

método para remoção de óxidos de nitrogênio em um gás de combustão, e, catalisador para remoção de óxidos de nitrogênio de um gás de combustão

compósito de catalisador, método para tratar uma corrente de descarga gasosa de um motor a diesel, e sistema para tratar uma corrente de descarga de motor a diesel

CATALYST FOR PRODUCING AMMONIA FROM HYDROCARBON AND NITROGEN OXIDES

Provided is a process for producing ammonia by the catalytic reduction of nitrogen oxide in the presence of a hydrocarbon, and in certain embodiments, in the presence of an oxygenated hydrocarbon.

METHOD FOR REMOVING CONTAMINANTS FROM GAS FLOWS CONTAINING WATER

The invention relates to adsorbents for removing contaminants from gas flows containing water, particularly for use in fuel cell systems, wherein the adsorbents contain oxides of elements selected from the group Cu, Fe, Zn, Ni, Co, Mn, Mg, Ba, Zr, Ce, La or combinations of said elements, at a copper oxide content of at least 30 wt %, and have pore volumes of less than 0.175 ml.g-1 for pores having a radius of less than 20 nm.

EXHAUST SYSTEM FOR A PISTON ENGINE

The invention relates to an exhaust system for a piston engine, comprising an oxidation catalytic converter and a particle filter connected downstream of said converter. Said catalytic converter has a catalytic structure (20) with a plurality of channels (22) that are parallel and open on both ends. According to the invention, the walls (24) between the channels (22) have a porosity of at least 30%.

LAYERED DIESEL OXIDATION CATALYST COMPOSITES

Provided are diesel exhaust components where palladium is segregated from a molecular sieve, specifically a zeolite, in a catalytic material. In the catalytic material, therefore, there are at least two layers: a palladium-containing layer that is substantially free of a molecular sieve and a hydrocarbon trap layer that comprises at least one molecular sieve and is substantially free of palladium. The palladium is provided on a high surface area, porous refractory metal oxide support. The catalytic material can further comprise a platinum component, where a minor amount of the platinum component is in the hydrocarbon trap layer, and a majority amount of the platinum component is in the palladium-containing layer. Systems and methods of using the same are also provided.

EXHAUST GAS PURIFICATION FILTER

An exhaust gas purification filter comprises a base material part, a catalyst layer, and sealing parts. The base material part comprises porous partition walls. The catalyst layer is supported on pore walls of the partition walls. The partition walls supporting the catalyst layer comprise 10% or less of pores having a pore diameter of 50 μm or more. In the pore diameter distribution in the partition walls supporting the catalyst layer, the pore diameter D50 at which the cumulative pore volume becomes 50% is 10 μm or more. The pore diameter D50, and the pore diameter D10 at which the cumulative pore volume becomes 10%, satisfy the relationship of the following Expression 1. 1. An exhaust gas purification filter comprising:a base material part having a honeycomb-structure, the base material part comprising porous partition walls and a plurality of cells which are partitioned by the partition walls and form an exhaust gas flow path,a catalyst layer supported on pore walls in the partition walls of the base material part, andsealing parts which seal the ends of the cells alternately at an exhaust gas inflow end face or at an outflow end face:wherein:the partition walls supporting the catalyst layer contain 10% or less of pores having a pore diameter of 50 μm or more and 5 to 15% of pores having a pore diameter of 0.1 μm to 5 μm, and{'claim-text': {'br': None, 'i': ['D', 'D', 'D'], '#text': '(50−10)/50≤0.9\u2003\u2003Expression I'}, '#text': 'in the pore distribution in the partition walls supporting the catalyst layer, the pore diameter D50 at which the cumulative pore volume becomes 50% is 10 μm or more, and the pore diameter D50 and the pore diameter D10 at which the cumulative pore volume becomes 10% satisfy the relationship of Expression I below.'}2. The exhaust gas purification filter according to claim 1 , wherein content of pores having a pore diameter of 50 μm or more in the partition walls in the base material part is 3 to 15%.3. The exhaust gas purification ...

Catalyzed SCR filter and emission treatment system

Provided is an emission treatment system and method for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The emission treatment system has an oxidation catalyst upstream of a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. Also provided is a method for disposing an SCR catalyst composition on a wall flow monolith that provides adequate catalyst loading, but does not result in unsuitable back pressures in the exhaust.

Process for the production of a zeolitic material via solvent-free interzeolitic conversion

A process for preparing a zeolitic material containing YO2 and X2O3, where Y and X represent a tetravalent element and a trivalent element, respectively, is described. The process includes (1) a step of preparing a mixture containing one or more structure directing agents, seed crystals, and a first zeolitic material containing YO2 and X2O3 and having FAU-, GIS-, MOR-, and/or LTA-type framework structures; and (2) a step of heating the mixture for obtaining a second zeolitic material containing YO2 and X2O3 and having a different framework structure than the first zeolitic material. The mixture prepared in (1) and heated in (2) contains 1000 wt % or less of H2O based on 100 wt % of YO2 in the framework structure of the first zeolitic material. A zeolitic material obtainable and/or obtained by the process and its use are also described.

EXHAUST GAS PURIFYING METHOD

A method of purifying an exhaust gas, includes: disposing a NOx trapping catalyst in an exhaust pipe of an internal combustion engine, the NOx trapping catalyst including: a metal substrate including cells, a corner portion of each of cells having an acute angle; and a catalyst layer supported in the metal substrate and including a noble metal, a heat-resistant inorganic oxide and a NOx trapping material, the catalyst layer having pores formed by addition of a pore formation promoting material, and the NOx trapping catalyst: adsorbing NOx in the exhaust gas when an exhaust air-fuel ratio is in a lean state; and desorbing and reducing the adsorbed NOx when the exhaust air-fuel ratio is in a stoichiometric state or a rich state; and removing the NOx by the exhaust air-fuel ratio being shifted between the lean state and the rich state.

Honeycomb filter

A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face or the outflow end face of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, a plugging length L1 in the cell extending direction of a central plugging portion in the central region is larger than a plugging length L2 of a circumferential plugging portion in the circumferential region, L1 ranges from 7 to 9 mm, and L2 from 3 to 6 mm.

EMISSION TREATMENT SYSTEM AND METHOD USING A SCR FILTER

CATALYST FOR THE OXIDATION OF SO2 TO SO3

Pollutant abatement system for gasoline vehicles

The present invention is directed to a pollutant abatement system for vehicles propelled by a gasoline combustion engine, in particular a gasoline direct injection engine (GDI). In addition, this invention is concerned with a process of mitigating noxious compounds in the exhaust of such an engine efficiently by applying the inventive abatement system to fulfill future legislative exhaust regulations.

Emission treatment system and method using a scr filter

Provided is an emission treatment system and method for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The emission treatment system has an oxidation catalyst upstream of a soot filter coated with a material effective in the Selective Catalyst Reduction (SCR) of NOx by a reductant, e.g. ammonia. Also provided is a method for disposing an SCR catalyst composition on a wall flow monolith that provides adequate catalyst loading, but does not result in unsuitable back pressures in the exhaust.

КАТАЛИТИЧЕСКИЙ ФИЛЬТР ДЛЯ ОБРАБОТКИ ВЫХЛОПНОГО ГАЗА

Изобретение относится к изделиям для обработки выхлопных газов сгорания, в частности к фильтрующему изделию и системе для обработки выхлопного газа. Фильтрующее изделие содержит: (а) непассивированный керамический фильтр с проточными стенками, содержащий пористую подложку, имеющую входную и выходную стороны; и (b) SСR каталитическую композицию, нанесенную на по меньшей мере одно из следующих мест: входную сторону пористой подложки, выходную сторону пористой подложки и между упомянутыми входной и выходной сторонами, где данная каталитическая композиция содержит кристаллы молекулярного сита, промотированного переходным металлом, и где: i) упомянутые кристаллы имеют средний кристаллический размер от приблизительно 0,5 до приблизительно 15 мкм, ii) упомянутые кристаллы присутствуют в упомянутой композиции в виде индивидуальных кристаллов, агломераций, имеющих средний размер частиц меньше чем приблизительно 15 мкм, или комбинаций упомянутых индивидуальных кристаллов и упомянутых агломераций; ...

КАТАЛИЗАТОР НА ОСНОВЕ МЕТАЛЛА ПЛАТИНОВОЙ ГРУППЫ (МПГ) ДЛЯ ОБРАБОТКИ ВЫХЛОПНЫХ ГАЗОВ

Изобретение раскрывает катализатор для обработки отработавших газов, образованных двигателями, работающими на обедненных топливных смесях, содержащий: (a) материал в виде алюмосиликатного молекулярного сита с узкими порами, содержащий множество кристаллов, имеющих поверхность и пористую матрицу, имеющий отношение кремнезема к глинозему от примерно 8 до примерно 150 и имеющий средний размер кристаллов от примерно 0,01 до примерно 10 микрон; и b) от 0,01 до 10 масс. % по меньшей мере одного металла платиновой группы (МПГ), в котором основное количество указанного металла платиновой группы (МПГ) встроено в указанную пористую матрицу по сравнению с металлом платиновой группы (МПГ), размещенным на указанной поверхности, при этом материал в виде молекулярного сита с узкими порами имеет каркасную структуру, выбранную из AEI, AFX и СНА, и содержание щелочи не более чем примерно 5 масс.% в расчете на общую массу алюмосиликатного молекулярного сита. Также раскрывается каталитическое изделие, содержащее ...

СПОСОБ И КАТАЛИЗАТОР ДЛЯ УДАЛЕНИЯ ОКСИДОВ АЗОТА ИЗ ОТХОДЯЩЕГО ГАЗА

Изобретение относится к удалению оксидов азота из выхлопных газов и отходящих газов из двигателей внутреннего сгорания и газовых турбин. Способ удаления оксидов азота осуществляется путем введения восстановительного реагента и восстановления оксидов азота в присутствии катализатора, который является слоем катализатора на основе цеолита на волнистом монолитном носителе, при этом носитель обладает плотностью от 50 г/л до 300 г/л и пористостью 50%, пористость монолитного носителя обусловлена порами, обладающими глубиной от 50 до 200 мкм и диаметром от 1 до 30 мкм. Изобретение обеспечивает эффективное удаление оксидов азота с помощью катализатора, обладающего улучшенной каталитической активностью и высокой стойкостью к частым изменениям температуры. 2 н. и 12 з.п. ф-лы, 5 ил., 1 табл., 1 пр.

ПОРИСТЫЙ НЕОРГАНИЧЕСКИЙ КОМПОЗИТНЫЙ ОКСИД

Изобретение относится к пористому неорганическому композитному оксиду, предназначенному для использования в качестве материала подложки для катализатора, включающему оксиды алюминия и церия, или оксиды алюминия и циркония, или оксиды алюминия, церия и циркония и необязательно один или более оксидов допирующих элементов, выбранных из переходных металлов, редкоземельных металлов и их смесей, причем указанный неорганический композитный оксид имеет: (a) удельную площадь поверхности после прокаливания при 1100°C в течение 5 часов, больше или равную площади, вычисленной согласно уравнению SA=0,8235[Al]+11,157, в котором: SA представляет собой удельную площадь поверхности неорганического композитного оксида по БЭТ, в квадратных метрах на грамм, и [Al] представляет собой количество оксидов алюминия в композитном оксиде, выраженное в виде массовых долей AlOна 100 массовых долей композитного оксида, и (b) общий объем пор после прокаливания при 900°С в течение 2 часов, больше или равный объему, вычисленному ...

КАТАЛИЗАТОР И СПОСОБ ПОЛУЧЕНИЯ КАТАЛИЗАТОРА

Изобретение касается катализатора (2) для очистки выхлопных газов с пористым керамическим носителем (4), имеющим пористость, которая образована порами в по меньшей мере части керамического носителя (4), и который, кроме того, имеет каталитически активное покрытие (10) из пористого оксида, нанесенное на керамический носитель (4). Каталитически активное покрытие из пористого оксида имеет толщину (d1) слоя, при этом носитель (4) имеет постоянную каталитически неактивную пропитку (12), содержащую по меньшей мере один каталитически неактивный неорганический компонент, не имеющий каталитической активности в отношении очистки выхлопных газов. Постоянная неактивная пропитка (12) присутствует в порах керамического носителя (4) в области с пониженной пористостью под поверхностью керамического носителя (4), и где при этом носитель (4) представляет собой монолитный компонент и состоит из каталитически активного материала, и только подобласть монолитного компонента снабжена пропиткой (12). Изобретение ...

НАНОРАЗМЕРНОЕ ФУНКЦИОНАЛЬНОЕ СВЯЗУЮЩЕЕ

КАТАЛИЗАТОР ОЧИСТКИ ВЫХЛОПНОГО ГАЗА

Изобретение относится к катализатору очистки выхлопного газа, содержащему два или больше каталитических слоев покрытия на субстрате, в котором каждый каталитический слой покрытия содержит частицы катализатора, имеющие состав, отличающийся от прилежащего каталитического слоя покрытия. При этом в верхнем каталитическом слое покрытия средняя толщина слоя покрытия находится в диапазоне от 25 мкм до 160 мкм, пористость, измеренная способом взвешивания в воде, находится в диапазоне от 50 до 80% от объема, и поры с высоким относительным удлинением, имеющие относительное удлинение, равное 5 или больше, занимают от 0,5 до 50% от общего объема пустот, и пора с высоким относительным удлинением имеет эквивалентный диаметр окружности от 2 мкм до 50 мкм на изображении поперечного сечения каталитического слоя покрытия, перпендикулярного направлению потока выхлопного газа, и имеет среднее относительное удлинение от 10 до 50. Технический результат изобретения заключается в увеличении эффективности очистки ...

ДИЗЕЛЬНЫЙ КАТАЛИЗАТОР ОКИСЛЕНИЯ, СОДЕРЖАЩИЙ НАНОЧАСТИЦЫ МЕТАЛЛА ПЛАТИНОВОЙ ГРУППЫ

КАТАЛИТИЧЕСКИЙ ФИЛЬТР ДЛЯ ОБРАБОТКИ ВЫХЛОПНОГО ГАЗА

... 1. Фильтрующее изделие, содержащее:(а) непассивированный керамический фильтр с проточными стенками, содержащий пористую подложку, имеющею входную и выходную стороны; и(b) SСR каталитическую композицию, нанесенную на, по меньшей мере, одно из следующих мест: входную сторону пористой подложки, выходную сторону пористой подложки и между упомянутыми входной и выходной сторонами, где данная каталитическая композиция содержит кристаллы молекулярного сита, промотированного переходным металлом, и где:i. упомянутые кристаллы имеют средний кристаллический размер от приблизительно 0,5 до приблизительно 15 мкм,ii. упомянутые кристаллы присутствуют в упомянутой композиции в виде индивидуальных кристаллов, агломераций, имеющих средний размер частиц меньше чем приблизительно 15 мкм, или комбинаций упомянутых индивидуальных кристаллов и упомянутых агломераций;iii. упомянутые кристаллы представляют собой алюмосиликат или силикоалюмофосфат со структурным типом, имеющим максимальный размер колец восемь тетраэдрических ...

КОМПОЗИЦИЯ НА ОСНОВЕ ОКСИДА ЦЕРИЯ И ОКСИДА ЦИРКОНИЯ С ОСОБОЙ ПОРИСТОСТЬЮ, СПОСОБ ПОЛУЧЕНИЯ И ПРИМЕНЕНИЕ В КАТАЛИЗЕ

... 1. Композиция на основе оксида церия и оксида циркония с содержанием оксида церия по меньшей мере 30 масс.%, отличающаяся тем, что после обжига при температуре 900°С в течение 4 ч она имеет два вида распределения пор, соответствующие диаметры которых сосредоточены вблизи величины, которая для первого вида распределения лежит в интервале от 5 нм до 15 нм для композиции, содержание оксида церия в которой составляет от 30% до 65%, или от 10 нм до 20 нм для композиции, содержание оксида церия в которой выше 65%, а для второго вида распределения в интервале от 45 нм до 65 нм для композиции, содержание оксида церия в которой составляет от 30% до 65%, или от 60 нм до 100 нм для композиции, содержание оксида церия в которой выше 65%.2. Композиция на основе оксида церия и оксида циркония с содержанием оксида церия по меньшей мере 30 масс.%, отличающаяся тем, что после обжига при температуре 1000°С в течение 4 ч она имеет два вида распределения пор, соответствующие диаметры которых сосредоточены ...

СПОСОБ УДАЛЕНИЯ ДИОКСИДА СЕРЫ ИЗ ГАЗОВЫХ ПОТОКОВ С ПРИМЕНЕНИЕМ ДИОКСИДА ТИТАНА В КАЧЕСТВЕ КАТАЛИЗАТОРА

ПОРИСТЫЕ УГЛЕРОДНЫЕ КОМПОЗИЦИОННЫЕ МАТЕРИАЛЫ И СПОСОБ ИХ ПОЛУЧЕНИЯ, А ТАКЖЕ АДСОРБЕНТЫ, КОСМЕТИЧЕСКИЕ СРЕДСТВА, СРЕДСТВА ОЧИСТКИ И КОМПОЗИЦИОННЫЕ ФОТОКАТАЛИТИЧЕСКИЕ МАТЕРИАЛЫ, СОДЕРЖАЩИЕ ИХ

... 1. Пористый углеродный композиционный материал, включающий: ! A) пористый углеродный материал, получаемый из материала растительного происхождения, имеющего содержание кремния, составляющее 5 мас.% или выше, в качестве исходного материала, причем указанный пористый углеродный материал имеет содержание кремния, составляющее 1 мас.% или меньше, и ! B) функциональный материал, закрепленный на пористом углеродном материале, причем пористый углеродный композиционный материал имеет удельную площадь поверхности 10 м2/г или больше, которую определяют по адсорбции азота методом BET, и объем пор 0,1 см3/г или больше, который определяют методом BJH и методом МР. ! 2. Пористый углеродный композиционный материал по п.1, в котором функциональный материал представляет собой магнитный материал. ! 3. Пористый углеродный композиционный материал по п.1, в котором функциональный материал обладает оптическим свойством. ! 4. Пористый углеродный композиционный материал по п.1, в котором функциональный материал ...

ПОДЛОЖКА КАТАЛИЗАТОРА ДЛЯ ОЧИСТКИ ВЫХЛОПНОГО ГАЗА, КАТАЛИЗАТОР ДЛЯ ОЧИСТКИ ВЫХЛОПНОГО ГАЗА НА ЕЕ ОСНОВЕ И СПОСОБ ПОЛУЧЕНИЯ ПОДЛОЖКИ КАТАЛИЗАТОРА ДЛЯ ОЧИСТКИ ВЫХЛОПНОГО ГАЗА

... 1. Подложка катализатора для очистки выхлопного газа, содержащая пористый сложный оксид металла, причем пористый сложный оксид металла содержит оксид алюминия, диоксид церия и диоксид циркония и имеет относительное содержание оксида алюминия 5-80% по массе,причем пористый сложный оксид металла получают посредством:независимого введения первого раствора из исходных веществ и второго раствора из исходных веществ непосредственно в область, в которой скорость сдвига составляет 1000-200000 с, и гомогенного смешивания растворов из исходных веществ с получением коллоидного раствора металлических соединений, причем первый раствор из исходных веществ содержит ион алюминия, ион церия и ион циркония, а второй раствор из исходных веществ содержит высокомолекулярный дисперсант, имеющий среднемассовую молекулярную массу 3000-15000,регулирования pH коллоидного раствора до значения между 3 и 5,обезжиривания коллоидного раствора после pH-регулирования или суспензии металлических соединений, которую получают ...

Anordnung zur Behandlung von Stickoxide (NOx) und Kohlenwasserstoffe (HC) enthaltenden Dieselmotorenabgasen

Anordnung zur Behandlung von Stickoxide (NOx) und Kohlenwasserstoffe (HC) enthaltenden Dieselmotorenabgasen, wobei ein SCR-System aus einem SCR-Katalysator und einer Einspritzeinrichtung für Reduktionsmittel vor einem Oxidationskatalysator angeordnet ist, wobei der SCR-Katalysator einen mit Kupfer (Cu) und/oder Eisen (Fe) ausgetauschten Zeolithen enthält und der Zeolith so beschaffen ist, dass die im Abgas enthaltenen Kohlenwasserstoffe durch die molekularsiebartige Wirkung des Zeolithen von den aktiven Zentren im Katalysator, an denen die Umsetzungen stattfinden, ferngehalten werden.

Exhaust System

A catalytic wall flow monolithic substrate having a pre-coated porosity of 50% or greater, comprises: a NOx storage and reduction zone, the NOx storage and reduction zone comprising a platinum group metal loaded on one or more first supports, the or each first support comprising an alkaline earth metal compound; and a selective catalytic reduction zone, the selective catalytic reduction zone comprising copper or iron loaded on a second support, the second support comprising a zeolite. The support may comprise a cerium compound. An exhaust system for an internal combustion engine comprising a lean NOx trap and a NOx storage and reduction zone comprising the catalytic wall flow monolithic substrate is also disclosed, as is a method for making said catalysed monolithic substrate.

Dirt separator for a vacuum cleaner

Dirt seperator for a vacuum cleaner

Zirconium based dispersion for use in coating filters

Dirt separator for a vacuum cleaner

Dirt separator for a vacuum cleaner

A dirt separator (10, fig 3) for a vacuum cleaner, the dirt separator comprises a chamber (36, fig 3) having an inlet (21, fig 3) through which dirt-laden fluid enters the chamber (36, fig 3) and an outlet (38, fig 3) through which cleansed fluid exits the chamber (36, fig 3) and a disc 40 located at the outlet (38, fig 3), the disc 40 being arranged to rotate about a rotational axis (48, fig 3) and comprising holes 47 through which the cleansed fluid passes. Each hole 47 has a tapered portion 76 which narrows from an upstream end to a downstream end thereof.

Exhaust system

Alkali resistant catalyst

ALKALI RESISTANT CATALYST

The present invention concerns the selective removal of nitrogen oxides (NOx) from gasses. In particular, the invention concerns a process, a catalyst and the use of a catalyst for the selective removal of nitrogen oxides in the presence of ammonia from gases containing a significant amount of alkali metal and/or alkali-earth compounds which process comprises using a catalyst combined of (i) a formed porous superacidic support, said superacidic support having an Hammett acidity stronger than Ho=-12, and (ii) a metal oxide catalytic component deposited on said superacidic support selected from the group consisting of oxides of Fe, Cu, V, Cr, Mn, and any mixtures thereof.

CATALYST COMPOSITION AND METHOD OF MANUFACTURE

According to various embodiments, a catalyst composition includes a catalytic metal secured to a porous substrate. The substrate has pores that are templated. The substrate is a product of adding (102) a substrate precursor to a water-in-oil microemulsion including a catalytic metal salt, a solvent, a templating agent, and water.

COMPOSITION COMPRISING CERIUM OXIDE AND ZIRCONIUM OXIDE HAVING A SPECIFIC POROSITY, PREPARATION METHOD THEREOF AND USE OF SAME IN CATALYSIS

La composition de l'invention est à base d'oxydes de cérium et de zirconium dans une proportion en oxyde de cérium d'au moins 30% en masse, elle présente après calcination à une température de 900°C pendant 4 heures, deux populations de pores dont les diamètres respectifs sont centrés, pour la première, autour d'une valeur comprise entre 5 nm et 15 nm pour une composition à teneur en oxyde de cérium de 30% à 65% ou comprise entre 10 nm et 20 nm pour une teneur en oxyde de cérium supérieure à 65% et, pour la seconde, autour d'une valeur comprise entre 45 nm et 65 nm pour une teneur en oxyde de cérium comprise entre 30% et 65% ou comprise entre 60 nm et 100 nm pour une composition à teneur en oxyde de cérium supérieure à 65%.

GASOLINE ENGINE EMISSIONS TREATMENT SYSTEMS HAVING PARTICULATE FILTERS

Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters are provided. Coated particle filters having washcoat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality to meet increasingly stringent regulations such as Euro 6, Sufficient to high levels of oxygen storage components (OSC) are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle size distribution such that a first set of particles has a first d90 particle size of 7.5 µ?? or less and a second set of particles ...

COMPOSITION CONTAINING OXIDES OF ZIRCONIUM, CERIUM AND AT LEAST ONE OTHER RARE EARTH AND HAVING A SPECIFIC POROSITY, METHOD FOR PREPARING SAME AND USE THEREOF IN CATALYSIS

La composition de l'invention est à base d'oxyde de zirconium, d'oxyde de cérium et d'oxyde d'yttrium ou elle est à base d'oxyde de zirconium, d'oxyde de cérium et d'au moins deux oxydes de deux terres rares autres que le cérium, dans une proportion en masse en oxyde de zirconium d'au moins 20% et en oxyde de cérium d'au plus 70%, et elle est caractérisée en ce qu'elle présente après calcination à une température de 900°C pendant 4 heures, deux populations de pores dont les diamètres respectifs sont centrés, pour la première, autour d'une valeur comprise entre 20 et 40 nm et, pour la seconde, autour d'une valeur comprise entre 80 nm et 200 nm. La composition peut être utilisée pour le traitement des gaz d'échappement des moteurs à combustion interne.

POWDERED TITANIUM OXIDE, METHOD FOR THE PRODUCTION THEREOF, AND USE THEREOF

PHOTOCATALYTIC ELEMENT FOR CLEANING AND DECONTAMINATION OF AIR AND WATER AND METHOD OF ITS MANUFACTURE

PHOTOCATALYTIC ELEMENT FOR PURIFICATION AND DISINFECTION OF AIR AND WATER AND METHOD FOR THE PRODUCTION THEREOF

Smoke extraction, purification, and sterilization module having improved catalyst performance and smoke extraction, purification, and sterilization device comprising same

COMPOSITION CONTAINING ZIRCONIUM OXIDES, OF CERIUM Of AT LEAST ANOTHER RARE EARTH, HAS SPECIFIC POROSITY, PROCEEDED OF PREPARATION AND USE IN CATALYSIS.

METHOD FOR DECOMPOSITION OF N2O USING A CATALYST BASED ON AN OXIDE OF CERIUM AND LANTHANUM.

L'invention concerne un procédé pour la décomposition du N2O. Ce procédé est caractérisé en ce qu'on utilise comme catalyseur un oxyde à base de cérium et de lanthane qui comprend en outre au moins un oxyde d'un élément choisi parmi le zirconium et les terres rares autres que le cérium et le lanthane. Ce catalyseur présente une stabilité améliorée qui permet son utilisation à température élevée.

배기 가스 정화 필터

... 본 발명에 의해 해결하려는 과제는 배기 가스 중의 미립자 물질을 효율적으로 처리할 수 있는 배기 가스 정화 필터를 제공하는 것이다. 본 발명은, 복수의 다공성 격벽을 포함하는 기재를 포함하는 배기 가스 정화 필터이며, 여기서 격벽은 배기 가스 유동로를 형성하고, 격벽 상에 다공성 촉매 층이 제공되며, 10 μm 이상의 두께를 갖는 촉매 층이 격벽의 종방향으로 격벽의 전체 길이의 적어도 20%에 걸쳐 제공되고, 유출측으로부터 15 mm의 격벽 상에는 10 μm 이상의 두께를 갖는 촉매 층이 존재하지 않는 것인 배기 가스 정화 필터를 제공한다.

SCR-활성 코팅을 갖는 촉매

... 본 발명은 길이 L의 촉매 기판 및 2개의 SCR-촉매적 활성 물질 A 및 B를 포함하는 촉매에 관한 것이고, 여기서, 상기 SCR-촉매적 활성 물질 A는 이온-교환된 철 및/또는 구리를 함유하는 레빈 구조 타입의 제올라이트를 포함하고, 상기 SCR-촉매적 활성 물질 B는 이온-교환된 철 및/또는 구리를 함유하는 캐버자이트 구조 타입의 제올라이트를 포함하고, (i) 상기 SCR-촉매적 활성 물질 A 및 B는 2개의 물질 구역 A 및 B의 형태로 존재하고, 물질 구역 A는 촉매 기판의 첫번째 말단으로부터 적어도 길이 L의 일부를 넘어서서 연장되고, 물질 구역 B는 촉매 기판의 두번째 말단으로부터 적어도 길이 L의 일부를 넘어서서 연장되거나, (ii) 상기 촉매 기판은 SCR-촉매적 활성 물질 A 또는 B 및 매트릭스 성분에 의해 형성되고, 상기 SCR-촉매적 활성 물질 B 또는 A는 물질 구역 B 또는 A의 형태로 적어도 상기 촉매 기판의 길이 L의 일부를 넘어서서 연장된다.

Powdered titanium oxide, processes for preparing the same and the use thereof

WASHCOAT LOADED POROUS CERAMICS WITH LOW BACKPRESSURE

Disclosed are washcoated ceramic honeycomb filters. The ceramic filters exhibit a relatively high level of washcoat loading while exhibiting minimized levels of backpressure. Also disclosed are methods for manufacturing the washcoated ceramic honeycomb filters. The method comprises providing an cell geometry derived from a predetermined level of washcoat loading to be applied to the ceramic honeycomb article.

GASOLINE ENGINE EMISSIONS TREATMENT SYSTEMS HAVING GASOLINE PARTICULATE FILTERS

Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters are provided. Coated particle filters having washcoat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality to meet increasingly stringent regulations such as Euro 6, Sufficient to high levels of oxygen storage components (OSC) are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle size distribution such that a first set of particles has a first d90 particle size of 7.5 μηι or less and a second set of particles ...

PLASMOCHEMICAL REACTOR FOR GENERATING A PLASMA DISCHARGE IN GASES

Плазмохимический реактор состоит из металлического корпуса (1), входного окна (2) и выходного окна (3), в котором расположен каталитический блок (4) и помещенные в нем две или более сборки изолированных диэлектрическим покрытием (5) электродов (6) и (7), подсоединенные к источнику питания. Сборки изолированных диэлектрическим покрытием электродов (6), (7) могут быть расположены в высокопористом ячеистом материале вдoль (фиг. l) или пoпepeк (фиг. 2) направлению потока газа. Высопористым ячеистым материалом заполнено все сечение плазмохимического реактора, вся поверхность которого имеет каталитический слой (8) (например, оксиды металлов, наночастицы металлов и др.), ускоряющий протекание плазмохимических реакций в гaзe.

WASHCOAT LOADED POROUS CERAMICS WITH LOW BACKPRESSURE

Disclosed are washcoated ceramic honeycomb filters. The ceramic filters exhibit a relatively high level of washcoat loading while exhibiting minimized levels of backpressure. Also disclosed are methods for manufacturing the washcoated ceramic honeycomb filters. The method comprises providing an cell geometry derived from a predetermined level of washcoat loading to be applied to the ceramic honeycomb article.

COMPOSITION CONTAINING OXIDES OF ZIRCONIUM, CERIUM AND AT LEAST ONE OTHER RARE EARTH AND HAVING A SPECIFIC POROSITY, METHOD FOR PREPARING SAME AND USE THEREOF IN CATALYSIS

The invention relates to a composition that contains zirconium oxide, cerium oxide and yttrium oxide, or zirconium oxide, cerium oxide and at least two oxides of two rare earths different from cerium in a mass proportion of at least 20 % of zirconium oxide and of at most 70 % of cerium oxide, characterized in that said composition comprises, after calcination at 900°C for 4 hours, two populations of pores having respective diameters centered, for the first population, about a value of between 20 and 40 nm and, for the second, about a value of between 80 and 200 nm. The composition can be used for processing exhaust gases of internal combustion engines.

PROCESS FOR TREATING EFFLUENTS IN A BED OF MICROBEADS BY COLD PLASMA AND PHOTOCATALYSIS

The invention relates to a process for treating effluents (2) circulating between the inlet (4) and the outlet (5) of a reactor (1), consisting in subjecting the effluents to a cold plasma treatment and to the action of a photocatalyzing agent under UV radiation with a view to the production of oxidizing species for the treatment of the effluents. According to the invention, the process consists in subjecting the effluents simultaneously to a cold plasma treatment and to the action of a photocatalyzing agent under UV radiation, the cold plasma treatment being carried out in an integrated and localized manner within a bed of porous microbeads (9) placed inside the reactor (1) and that carry the photocatalyzing agent making it possible to ensure the generation of oxidizing species, and also their diffusion within the bed.

METHOD AND APPARATUS FOR FILTRATION OF A TWO-STROKE ENGINE EXHAUST

A highly porous ceramic filter consisting essentially of bonded ceramic fibers forms a part of an exhaust filtration system for a gasoline two-stroke engine. The porosity of the substrate permits accumulation of particulate constituents of the exhaust stream without detracting from the engine performance due to backpressure. Embodiments of the porous ceramic filter are disposed with a catalyst to facilitate reduction of gaseous and particulate byproducts of combustion from the two-stroke engine, so that emission of harmful pollutants is minimized.

Catalyst and method of manufacture

According to various embodiments, a catalyst composition includes a catalytic metal secured to a porous substrate. The substrate has pores that are templated. The substrate is a product of adding a substrate precursor to a water-in-oil microemulsion including a catalytic metal salt, a solvent, a templating agent, and water.

Gas treatment by catalytic ozone oxidation

In one embodiment, a catalyst for ozone oxidation of pollutant components dispersed in a gas is provided. The ozone oxidation catalyst has a porous body formed from a metal body, a ceramic, or polymeric fibers coated with metal. A catalytic noble metal composition is deposited on the surface of the porous body. The catalytic noble metal composition is formed from particles of a noble metal supported by a mesoporous molecular sieve.

Alumina catalyst support

The present invention is directed to a high surface area, high pore volume porous alumina, comprising: aluminum oxide, optionally, silicon oxide and aluminosilicates, and optionally one or more dopants, said alumina having a specific surface area of from about 100 to about 500 square meters per gram and a total pore volume after calcination at 900° C. for 2 hours of greater than or equal to 1.2 cubic centimeters per gram, wherein less than or equal to 15% of the total pore volume is contributed by pores having a diameter of less than 10 nm.

Porous inorganic composite oxide

A porous inorganic composite oxide containing oxides of aluminum and of cerium and/or zirconium, and, optionally, oxides of one or more dopants selected from transition metals, rare earths, and mixtures thereof, and having a specific surface area, in m 2 /g, after calcining at 1100° C. for 5 hours, of ≧0.8235[Al]+11.157 and a total pore volume, in cm 3 /g, after calcining at 900° C. for 2 hours, of ≧0.0097[Al]+0.0647, wherein [Al] is the amount of oxides of aluminum, expressed as pbw Al 2 O 3 per 100 pbw of the composite oxide; a catalyst containing one or more noble metals dispersed on the porous inorganic composite oxide; and a method for making the porous inorganic composite oxide.

Reduction-catalyst-coated diesel particle filter having improved characteristics

A diesel particle filter which comprises a ceramic wall flow filter substrate and two coatings is described. The first coating which is applied in the inflow channels and is composed of high-melting materials has such a nature that it closes the inflow channels and pores in the wall connecting the inflow channels and outflow channels to soot particles on the inflow side without preventing passage of the gaseous exhaust gas constituents. The second coating is introduced into the wall between inflow channels and outflow channels and is of such a nature that it can effectively catalyze the selective reduction of nitrogen oxides by means of a reducing agent. The resulting component is an SCR-catalytically active particle filter and displays excellent banking-up pressure properties combined with high filtration efficiency and good regeneration properties. Furthermore, the component displays good aging stability of the NO x conversion activity.

Stabilized microporous crystalline material, the method of making the same, and the use for selective catalytic reduction of nox

There is disclosed a microporous crystalline material having pore opening ranging from 3 to 5 Angstroms, where the material comprises a first metal chosen from alkali earth group, rare earth group, alkali group, or mixtures thereof, and a second metal chosen from iron, copper or mixtures thereof; and has a molar silica to alumina ratio (SAR) from 3 to 10. The microporous crystalline material disclosed herein may comprise a crystal structure having building units of double-6-rings (d6r) and pore opening of 8-rings as exemplified with framework types defined by the Structure Commission of the International Zeolite Association having structural codes of CHA, LEV, AEI, AFT, AFX, EAB, ERI, KFI, SAT, TSC, and SAV. There is also disclosed a method of selective catalytic reduction of nitrogen oxides in exhaust gas, comprising at least partially contacting the exhaust gases with an article comprising the disclosed microporous crystalline material.

Emissions Treatment System with Ammonia-Generating and SCR Catalysts

Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component, such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines.

EXHAUST GAS PURIFICATION DEVICE

A substrate () includes an inflow-side cell (), an outflow-side cell (), and a porous, gas-permeable partition wall () that separates the inflow-side cell () and the outflow-side cell () from each other, and also includes a first catalyst portion () that is provided on a side of the partition wall () that faces the inflow-side cell () at least at a portion in upstream side in an exhaust gas flow direction, and a second catalyst portion () that is provided on a side of the partition wall that faces the outflow-side cell at least at a portion in downstream side. With respect to a pore volume of pores with a pore size of 10 to 18 μm, when a measured value of the pore volume in the first catalyst portion () and the partition wall () within a region where the first catalyst portion () is provided is defined as a first pore volume, and a measured value of the pore volume in the second catalyst portion () and the partition wall () within a region where the second catalyst portion () is provided is defined as a second pore volume, the first pore volume is greater than the second pore volume. A catalytically active component contained in the first catalyst portion () and a catalytically active component contained in the second catalyst portion () are of different types. 1. An exhaust gas purification catalyst comprising:a substrate; anda catalyst portion provided in the substrate, an inflow-side cell including a space whose inflow-side in an exhaust gas flow direction is open and whose outflow-side is closed;', 'an outflow-side cell including a space whose inflow-side in the exhaust gas flow direction is closed and whose outflow-side is open; and', 'a porous partition wall that separates the inflow-side cell and the outflow-side cell from each other, and, 'the substrate including a first catalyst portion that is provided at least on a portion of a side of the partition wall that faces the inflow-side cell, the portion being located on an upstream side in the flow direction; ...

EXHAUST-GAS PURIFICATION APPARATUS AND METHOD FOR MANUFACTURING SAME

An exhaust-gas purification apparatus includes: a honeycomb base material including a plurality of exhaust-gas flow paths partitioned by a porous wall; and one or more catalyst noble metals carried by the honeycomb base material. The catalyst noble metals are selected from the group consisting of platinum, palladium, and rhodium. The honeycomb base material has a noble metal concentrated surface section in which a 50%-by-mass noble metal carry depth for a specific noble metal that is one type among one or two catalyst noble metals is less than 50% of the distance from the surface to the center of the inside of the porous wall. The 50%-by-mass noble metal carry depth is the depth at which, when the amount of the specific noble metal carried between the surface and the center of the inside of porous wall is used as a reference, 50% by mass of specific noble metal is carried. 1. An exhaust gas purification device comprising a honeycomb substrate having a plurality of exhaust gas flow paths separated by a porous wall , and one or more catalyst noble metals which are carried by the honeycomb substrate , whereinthe honeycomb substrate includes ceria-zirconia composite oxide particles as a constituent material,the catalyst noble metals are selected from the group consisting of platinum, palladium, and rhodium, 'a noble metal-enriched surface part in which a 50 mass % noble metal carrying depth of a specific noble metal, which is one of the one or more catalyst noble metals, is less than 50% of the distance from a surface of the porous wall to a center of an interior of the porous wall, and', 'the honeycomb substrate hasthe 50 mass % noble metal carrying depth is a depth in which 50 mass % of the specific noble metal is carried based on a quantity of the specific noble metal carried from the surface of the porous wall to the center of the interior of the porous wall.2. The exhaust gas purification device according to claim 1 , whereinthe specific noble metal is platinum or ...

Photocatalytic element for purification and disinfection of air and water and method for the production thereof

The invention relates to the purification and disinfection of air and water. A photocatalytic element consists of sintered glass beads with a pore volume fraction from 20% to 40% and a pore size from 0.1 to 0.5 mm, the surface of which is coated with a titanium dioxide powder, having a specific surface area of 150-400 m 2 /g, at the rate of 0.5-2% relative to the total mass of the photocatalytic element. The surface of the glass beads has a relief shape with a relief depression of 0.5-10 pm. The method for producing the photocatalytic element comprises sintering the glass beads at a temperature that is 5-20° C. higher than the glass softening temperature, modifying the bead surface with chemical etching agents, and coating the bead surface with the titanium dioxide powder from a water suspension at a pH of 2.9±0.1.

Nano-sized functional binder

Described are catalytic articles comprising a substrate having a washcoat on the substrate, the washcoat containing a catalytic component having a first average (D50) particle size and a functional binder component having a second average (D50) particle size in the range of about 10 nm to about 1000 nm, wherein the ratio of the first average (D50) particle size to the second average (D50) particle size is greater than about 10:1. The catalytic articles are useful in methods and systems to purify exhaust gas streams from an engine.

Honeycomb bodies having an array of channels with different hydraulic diameters and methods of making the same

A honeycomb body comprises a matrix of intersecting porous walls forming channels. Plugs are disposed in a percentage of the channels having the second hydraulic diameter, wherein the percentage of the channels of the second diameter having a plug is less than or equal to 15%. In some embodiments, some of the channels have a first hydraulic diameter and others have a second hydraulic diameter that is smaller than the first hydraulic diameter, and may be unplugged for plugged. The porous walls can further comprise a transverse thickness of the walls Tw less than or equal to 0.20 mm, a channel density CD greater than or equal to 62 channels per cm2, an average bulk porosity % P greater than or equal to 50%, and a median pore diameter d50 ranging from between 4.0 μm and 30.0 μm.

Filtration of Chromium From Flue Gas In Furnace Stacks

Chromium particulate emissions in flue gas can be reduced or minimized by incorporating a thin layer bed of a catalyst within the flue gas flow path of a furnace, boiler, or other furnace environment that includes Cr-containing surfaces. The thin layer bed of catalyst can correspond to, for example, a honeycomb monolith with catalyst supported on the monolith surface, so as to provide a high contact area while forcing all of the flue gas to pass through the catalyst bed. The honeycomb monolith structure and the depth of the bed can be selected to provide a reduced or minimized pressure drop across the catalyst bed, such as a pressure drop of 0.25 kPa (1.0 inches of water) or less. Exposing the Cr-containing flue gas to the thin layer catalyst bed can result in a treated flue gas with a lower content of Cr. 1. A method for reducing the Cr content of a flue gas , comprising:combusting a fuel in a furnace environment to form a flue gas;exposing at least a portion of the flue gas to one or more surfaces comprising a Cr-containing metal to form a Cr-containing flue gas; andexposing the Cr-containing flue gas to a catalyst bed comprising a Group 5 metal, a Group 6 metal, a Group 8-11 metal, or a combination thereof to form a treated flue gas, wherein the catalyst bed comprises a bed height of 0.8 m to 2.0 m, and wherein the flue gas is at a temperature in the range of from 100° C. to 590° C. during exposure to the catalyst bed.2. The method of claim 1 , wherein the Cr-containing flue gas comprises 5.0 μg/dscm or more of Cr and the treated flue gas comprises 4.0 μg/dscm or less.3. The method of claim 1 , wherein the catalyst bed comprises a honeycomb monolith.4. The method of claim 3 , wherein the honeycomb monolith comprises a cell density of 100 to 1000 cells per square inch.5. The method of claim 1 , wherein the Cr-containing flue gas is exposed to the catalyst bed at a temperature of 420° C. to 500° C.6. The method of claim 1 , wherein the Cr-containing flue gas is ...

CATALYZED SCR FILTER AND EMISSION TREATMENT SYSTEM

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. 1. A catalyst article consisting essentially of a wall flow monolith and a catalytic material , wherein the wall flow monolith has a plurality of longitudinally extending passages fatined by longitudinally extending walls bounding and defining said passages , wherein the passages comprise inlet passages having an open inlet end and a closed outlet end , and outlet passages having a closed inlet end and an open outlet end , the wall flow monolith has a porosity of from 50% to 60% and an average pore size of from 10 to 25 microns , and the wall flow monolith contains the catalytic material;{'sup': '3', 'wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from one or more of a copper and iron component, the washcoat permeating the walls at a loading up to 2.4 g/in, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.'}2. The catalyst article of claim 1 , wherein the SCR catalyst composition permeates the walls of the monolith at a concentration of at least 1.3 g/in.3. The catalyst article of claim 2 , wherein there is from 1.6 to 2.4 g/inof SCR catalyst composition disposed on the wall flow monolith.4. The catalyst article of claim 1 , wherein the SCR catalyst composition is effective to catalyze the reduction of NOx at a temperature below about 600° C. and is able to aid in regeneration of the wall flow monolith by lowering the temperature at which soot captured by the wall flow monolith is combusted.5. The catalyst article of ...

Nano-sized functional binder

Described are catalytic articles comprising a substrate having a washcoat on the substrate, the washcoat containing a catalytic component having a first average (D50) particle size and a functional binder component having a second average (D50) particle size in the range of about 10 nm to about 1000 nm, wherein the ratio of the first average (D50) particle size to the second average (D50) particle size is greater than about 10:1. The catalytic articles are useful in methods and systems to purify exhaust gas streams from an engine.

Adsorbents for removing contaminants from gas flows containing water

The invention relates to adsorbents for removing impurities from water-comprising gas streams, in particular for use in fuel cell systems, wherein the adsorbents comprise oxides of elements selected from the group consisting of Cu, Fe, Zn, Ni, Co, Mn, Mg, Ba, Zr, Ce, La or combinations of these elements, have a copper oxide content of at least 30% by weight and have pore volumes of less than 0.175 ml·g −1 for pores having a radius of less than 20 nm.

Exhaust gas purifying filter

Provided is an exhaust gas purifying filter used with a HC purifying catalyst supported thereon. Numerous pores are formed in partitions of the exhaust gas purifying filter. In a cross-section of the partition, pores are open at a passage surface, having an open end of which the opening diameter is 50 μm or larger. In the cross-section of the partitions, the partitions include a narrow part where a pore diameter is 5 μm or more and the pore diameter becomes a minimum in a region. In the cross-section of the partitions, the region is positioned between a pair of virtual lines L 1 and L 2 extending from opposing sides of the opening end to a passage surface positioned opposite to the opening end along the wall thickness direction X, Z. The pore diameter at the narrow part is 6% or more and less than or equal to 20% of the opening diameter.

Exhaust gas purification filter

An exhaust gas purification filter is used so as to support a NO X purification catalyst. The exhaust gas purification filter includes a honeycomb structure portion and a plug portion. The honeycomb structure portion includes a partition wall and cells. Numerous pores are formed in the partition wall. The cells are partitioned by the partition walls and form a flow path for an exhaust gas. The plug portion alternately seals an inflow end surface or an outflow end surface for the exhaust gas in the cells. The partition wall has a gas permeability coefficient that is equal to or greater than 0.35×10 −12 m 2 , a pore volume ratio of pore diameters of 9 μm or less that is equal to or less than 25%, and an average pore diameter that is equal to or greater than 12 μm.

POROUS CARBON MATERIAL COMPOSITES AND THEIR PRODUCTION PROCESS, ADSORBENTS, COSMETICS, PURIFICATION AGENTS, AND COMPOSITE PHOTOCATALYST MATERIALS

A porous carbon material composite formed of a porous carbon material and a functional material and equipped with high functionality. The porous carbon material composite is formed of (A) a porous carbon material obtainable from a plant-derived material having a silicon (Si) content of 5 wt % or higher as a raw material; and (B) a functional material adhered on the porous carbon material, and has a specific surface area of 10 m/g or greater as determined by the nitrogen BET method and a pore volume of 0.1 cm/g or greater as determined by the BJH method and MP method. 1. A process for producing a porous carbon material composite , the process comprising:carbonizing a silicon-containing plant-derived material at from 800° C. to 1,400° C. and generating a precursor carbonized material;reducing the silicon in the precursor carbonized material by treating the carbonized material with a hydrofluoric acid or an alkali;activating the precursor carbonized material by subjecting the precursor carbonized material to a steam stream and generation a porous carbon material; andcausing a functional material to adhere on the porous carbon material.2. The process of claim 1 , comprising activating the precursor carbonized material by subjecting the precursor carbonized material to the steam stream for at least two hours claim 1 , the steam being at a temperature of 900 degrees Centigrade.3. The process of claim 1 , comprising reducing the silicon in the precursor carbonized material by treating the carbonized material with the hydrofluoric acid.4. The process for producing the porous carbon material composite according to claim 1 , wherein:the plant-derived material has a silicon content of 5 wt % or higher;the porous carbon material has a silicon content of 1 wt % or lower; and{'sup': 2', '3, 'the porous carbon material composite has a specific surface area of 10 m/g or greater as determined by the nitrogen BET method and a pore volume of 0.1 cm/g or greater as determined by the ...

CATALYST FOR REDUCTION OF NITROGEN OXIDES

The invention relates to a nitrogen oxide storage catalyst composed of at least two catalytically active washcoat layers on a support body, wherein a lower washcoat layer A comprises cerium oxide, an alkaline earth metal compound and/or an alkali compound, platinum and palladium, and an upper washcoat layer B located above washcoat layer A comprises cerium oxide, platinum and palladium, does not contain any alkali and alkaline-earth compounds, and has macropores. Also disclosed is a method for converting NOx in exhaust gases from motor vehicles operated with lean-burn engines. 2. Nitrogen oxide storage catalyst according to claim 1 , characterized in that washcoat layer A contains cerium oxide in a quantity of 110 to 160 g/L.3. Nitrogen oxide storage catalyst according to claim 1 , characterized in that washcoat layer B contains cerium oxide in a quantity of 22 to 120 g/L.4. Nitrogen oxide storage catalyst according to claim 1 , characterized in that the alkaline earth compound in washcoat layer A is an oxide claim 1 , carbonate claim 1 , and/or hydroxide of magnesium claim 1 , strontium claim 1 , and/or barium.5. Nitrogen oxide storage catalyst according to claim 1 , characterized in that the alkaline earth compound in washcoat layer A is magnesium oxide claim 1 , barium oxide claim 1 , and/or strontium oxide.6. Nitrogen oxide storage catalyst according to claim 1 , characterized in that the alkaline earth or alkali compound in washcoat layer A is present in quantities of 10 to 50 g/L claim 1 , calculated as alkaline earth or alkali oxide and in relation to the volume of the support body.7. Nitrogen oxide storage catalyst according to claim 1 , characterized in that washcoat layer A contains manganese oxide.8. Nitrogen oxide storage catalyst according to claim 7 , characterized in that manganese oxide is present in washcoat layer A in quantities of 1 to 10 wt % in relation to the total of washcoat layers A and B and calculated as MnO.9. Nitrogen oxide storage ...

Composite material

A composite material comprises a macroporous silicate-based material at least partially substituted with at least one microporous zeolite, wherein the microporous zeolite is functionalised with either copper, iron or both copper and iron, and wherein the composite material is in the form of particles. The composite material can be obtained using a method comprising the steps of: (i) providing a mixture comprising a silicate-containing scaffold having a macroporous structure, an aluminium source and an organic template; (ii) hydrothermally treating the mixture to form a microporous zeolite-containing structure substantially retaining the macroporous structure of the silicate-containing scaffold; (iii) incorporating copper, iron or both copper and iron into the zeolite. The cate-containing scaffold can be a diatomaceous earth.

NANOCRYSTAL-SIZED CERIUM-ZIRCONIUM-ALUMINUM OXIDE MATERIAL AND METHOD OF MAKING THE SAME

A nanocrystal-sized cerium-zirconium-aluminum mixed oxide material includes at least 20% by mass zirconium oxide; between 5% to 55% by mass cerium oxide; between 5% to 60% by mass aluminum oxide; and a total of 25% or less by mass of at least one oxide of a rare earth metal selected from the group of lanthanum, neodymium, praseodymium, or yttrium. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide exhibits hierarchically ordered aggregates having a dso particle size less than 1.5 μm, and retains at least 80% of surface area and pore volume after ageing at temperature higher than 1000° C. for at least 6 hours. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide material is prepared using a co-precipitation method followed by milling the dried and calcined oxide material. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide material forms a particulate filter that may be used in an exhaust system arising from a gas or diesel engine

ZEOLITE CATALYST AND METHOD FOR PRODUCING LOWER OLEFIN

A CON zeolite satisfying the following (1) to (2): (1) The framework is CON as per the code specified by the International Zeolite Association (IZA); and (2) It contains silicon and aluminum, and the molar ratio of aluminum to silicon is 0.04 or more. 1. A CON zeolite , silicon and aluminum in a molar ratio of aluminum to silicon of 0.04 or more and the framework is CON as per the code specified by the International Zeolite Association (IZA).2. The CON zeolite according to having a crystal of polymorph B.3. The CON zeolite according to claim 1 , wherein the molar ratio of aluminum to silicon is higher than 0.08.4. A method of producing a zeolite of the type CON as per the code specified by the International Zeolite Association (IZA) by hydrothermal synthesis of a mixture comprising a silicon source claim 1 , an aluminum source claim 1 , an alkali metal element source and/or an alkaline earth metal element source claim 1 , an organic structure-directing agent claim 1 , and water claim 1 , wherein the molar ratio of aluminum to silicon in the mixture is higher than 0.01.5. The method of producing a CON zeolite according to claim 4 , wherein the zeolite has a crystal of polymorph B.6. The method of producing a CON zeolite according to claim 4 , wherein the molar ratio of aluminum to silicon in the mixture is 0.08 or more.7. A CON zeolite obtained by the method of according to .8. A catalyst for producing a lower olefin or an aromatic hydrocarbon containing the CON zeolite according to .9. A catalyst for producing a lower olefin or an aromatic hydrocarbon containing the CON zeolite according to .10. A catalyst for producing a lower olefin or an aromatic hydrocarbon containing the CON zeolite according to .11. A catalyst for producing a lower olefin or an aromatic hydrocarbon containing the CON zeolite according to .12. An adsorbent containing the CON zeolite according to .13. An adsorbent containing the CON zeolite according to .14. An adsorbent containing the CON ...

MOLYBDENUM BASED CATALYST SUPPORTED ON TITANIA-MODIFIED ZEOLITE

A supported catalyst having catalytic species including molybdenum as well as cobalt and/or vanadium as a promoter disposed on a support material containing zeolite modified with titanium dioxide. Various methods of preparing and characterizing the supported catalyst are disclosed. The utilization of the catalyst in treating a hydrocarbon feedstock containing sulfur compounds (e.g. dibenzothiophene) to produce a desulfurized hydrocarbon stream is also provided. 1: A Mo-based hydrodesulfurization catalyst , comprising:a support material comprising a titania-modified zeolite; anda catalytic material disposed on the support material,wherein:the catalytic material comprises molybdenum and at least one promoter;the support material has a weight ratio of zeolite to titania in a range of 5:1 to 25:1; andthe Mo-based hydrodesulfurization catalyst has a molybdenum content in a range of 10-25 wt % relative to a total weight of the Mo-based hydrodesulfurization catalyst.2: The Mo-based hydrodesulfurization catalyst of claim 1 , wherein the support material has a Si:Al weight ratio of 2:1 to 3:1 claim 1 , and a Si:Ti weight ratio of 3:2 to 7:1.3: The Mo-based hydrodesulfurization catalyst of claim 1 , wherein the at least one promoter comprises cobalt claim 1 , vanadium claim 1 , or both.4: The Mo-based hydrodesulfurization catalyst of claim 3 , wherein the at least one promoter comprises cobalt claim 3 , and wherein the Mo-based hydrodesulfurization catalyst has a cobalt content in a range of 1-5 wt % relative to a total weight of the Mo-based hydrodesulfurization catalyst.5: The Mo-based hydrodesulfurization catalyst of claim 3 , wherein the at least one promoter comprises vanadium claim 3 , and wherein the Mo-based hydrodesulfurization catalyst has a vanadium content in a range of 0.5-4 wt % relative to a total weight of the Mo-based hydrodesulfurization catalyst.6: The Mo-based hydrodesulfurization catalyst of claim 3 , wherein the at least one promoter comprises cobalt and ...

Low-Temperature Oxidation Catalyst With Particularly Marked Hydrophobic Properties For The Oxidation Of Organic Pollutants

The present invention relates to a catalyst comprising a macroporous noble metal-containing zeolite material and a porous SiO-containing binder, wherein the catalyst has a proportion of micropores of more than 70%, based on the total pore volume of the catalyst. The invention is additionally directed to a process for preparing the catalyst and to the use of the catalyst as an oxidation catalyst. 19.-. (canceled)10. Method of producing a catalyst according to , comprising the following steps:a) introducing a noble metal precursor compound into a microporous zeolite material;b) calcining the zeolite material loaded with the noble metal precursor compound;{'sub': '2', 'c) mixing the zeolite material loaded with the noble metal compound with a porous SiO-containing binder and a solvent;'}d) drying and calcining the mixture comprising the zeolite material loaded with the noble metal compound and the binder.11. Method according to claim 10 , wherein the mixture obtained in step c) is applied to a support.12. (canceled) The present invention relates to a catalyst comprising a microporous noble metal-containing zeolite material and a porous SiO-containing binder, wherein the catalyst has a proportion of micropores of more than 70%, relative to the total pore volume of the catalyst. The invention is additionally directed to a method of producing the catalyst as well as to the use of the catalyst as oxidation catalyst.Purifying exhaust gases by means of catalysts has been known for some time. For example, the exhaust gases from combustion engines are purified with so-called three-way catalysts (TWC). The nitrogen oxides are reduced with reductive hydrocarbons (HC) and carbon monoxide (CO).Likewise, the exhaust gases from diesel engines are post-treated with catalysts. Here, carbon monoxide, unburnt hydrocarbons, nitrogen oxides and soot particles, for example, are removed from the exhaust gas. Unburnt hydrocarbons which are to be treated catalytically include paraffins, ...

ZIRCONIA-BASED AQUEOUS NP-DISPERSION FOR USE IN COATING FILTER SUBSTRATES

This invention relates to an aqueous dispersion of particles, the dispersion having a particle content of 10-70 wt %, and the particles comprising, on an oxide basis: (a) 10-98 wt % in total of ZrO+HfO, and (b) 2-90 wt % in total of AIO, CeO, LaO, NdO, PrO, YO, or a transition metal oxide, wherein the dispersion has a Z-average particle size of 100-350 nm and the particles have a crystallite size of 1-9 nm. The invention also relates to a substrate coated with the aqueous dispersion of particles. 2. The aqueous dispersion of particles as claimed in claim 1 , wherein the particles comprise claim 1 , on an oxide basis:{'sub': ['2', '2'], '#text': '(a) 10-98 wt % in total of ZrO+HfO,'}{'sub': '2', '#text': '(b) 2-90 wt % CeO,'}{'sub': ['2', '3', '2', '3', '6', '11', '2', '3'], '#text': '(c) 0-30 wt % in total of LaO, NdO, PrO, YO, or a transition metal oxide, and'}{'sub': ['2', '3'], '#text': '(d) 0-88 wt % AlO.'}3. The aqueous dispersion of particles as claimed in claim 1 , wherein the particles comprise claim 1 , on an oxide basis claim 1 , 25-80 wt % in total of ZrOand HfO.4. The aqueous dispersion of particles as claimed in claim 1 , wherein the zirconia-ceria particles comprise claim 1 , on an oxide basis claim 1 , 10-80 wt % CeO.5. The aqueous dispersion of particles as claimed in claim 1 , wherein the zirconia-ceria particles comprise claim 1 , on an oxide basis claim 1 , 0-25 wt % in total of LaO claim 1 , NdO claim 1 , PrO claim 1 , YO claim 1 , and transition metal oxides.6. The aqueous dispersion of particles as claimed in claim 1 , wherein the dispersion has a particle content of 10-45 wt %.7. The aqueous dispersion of particles as claimed in claim 1 , wherein the dispersion additionally comprises particles comprising claim 1 , on an oxide basis claim 1 , at least 50 wt % AlO.8. The aqueous dispersion of particles as claimed in claim 1 , wherein the dispersion has a polydispersity index of 0.15-0.35.9. The aqueous dispersion of particles as claimed in claim ...

Manganese-Cobalt Spinel Oxide Nanowire Arrays

Manganese-cobalt (Mn—Co) spinel oxide nanowire arrays are synthesized at low pressure and low temperature by a hydrothermal method. The method can include contacting a substrate with a solvent, such as water, that includes MnO4- and Co2 ions at a temperature from about 60° C. to about 120° C. The method preferably includes dissolving potassium permanganate (KMnO4) in the solvent to yield the MnO4— ions. the substrate is The nanoarrays are useful for reducing a concentration of an impurity, such as a hydrocarbon, in a gas, such as an emission source. The resulting material with high surface area and high materials utilization efficiency can be directly used for environment and energy applications including emission control systems, air/water purifying systems and lithium-ion batteries. 1. A method of making a manganese-cobalt (Mn—Co) spinel oxide nanoarray on a substrate , comprising:{'sub': '4', 'sup': −', '2+, 'contacting a substrate with a solvent comprising MnOand Coions at a temperature from about 60° C. to about 120° C.'}2. The method of claim 1 , further comprising dissolving potassium permanganate (KMnO) in the solvent to yield the MnOions.3. The method of claim 1 , further comprising dissolving cobalt nitrate in the solvent to yield the Coions.4. The method of claim 3 , wherein the cobalt nitrate is cobalt nitrate hexahydrate (CO(NO)⋅6HO).5. The method of claim 1 , wherein the solvent is water.6. The method of claim 1 , further comprising varying the concentration of MnOor Coions in the solvent to control deposition rate of the manganese-cobalt spinel oxide nanoarray.7. The method of claim 1 , further comprising controlling the temperature of the solvent to control deposition rate of the manganese-cobalt spinel oxide nanoarray.8. The method of claim 1 , wherein the substrate has a honeycomb structure.9. The method of claim 1 , wherein the substrate is a cordierite honeycomb.10. The method of claim 1 , further comprising contacting a substrate with a solvent ...

CATALYZED SCR FILTER AND EMISSION TREATMENT SYSTEM

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. 127-. (canceled)28. A method for disposing a selective catalytic reduction (SCR) catalyst composition on a wall flow monolith , wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages , wherein the passages comprise inlet passages having an open inlet end and a closed outlet end , and outlet passages having a closed inlet end and an open outlet end , the method comprising:receiving an aqueous slurry comprising the SCR catalyst composition, the SCR catalyst composition comprising a zeolite and a base metal component;immersing the wall flow monolith in the aqueous slurry from a first direction to deposit the SCR catalyst composition on the inlet passages;removing excess aqueous slurry from the inlet passages;immersing the wall flow monolith in the aqueous slurry from a second direction, opposite the first direction, to deposit the SCR catalyst composition on the outlet passages and form a coated wall flow monolith;removing excess aqueous slurry from the outlet passages; and{'sup': '3', 'drying and calcining the coated wall flow monolith to form an integrated soot filter and SCR catalyst, wherein the SCR catalyst composition is present on the coated wall flow monolith at a concentration of at least 1.3 g/in.'}29. The method of claim 28 , wherein the SCR catalyst composition permeates the walls.30. The method of claim 28 , wherein the SCR catalyst composition is present on the coated wall flow monolith at a concentration of 1.6 to 2.4 g/in.31. The method of claim 28 , wherein the calcining step comprises calcining at a temperature in the range ...

EXHAUST GAS PURIFYING DEVICE

An exhaust gas purifying device includes a honeycomb catalyst body, a plugged honeycomb structure and a can member to receive therein the honeycomb catalyst body and the plugged honeycomb structure, and the plugged honeycomb structure disposed at a position on a downstream side of the honeycomb catalyst body is designed so that a pressure loss in an end face central region of at least one of a second inflow side end face and a second outflow side end face of a second honeycomb substrate is larger than a pressure loss of an end face circumferential region positioned around the end face central region. 1. An exhaust gas purifying device comprising:a honeycomb catalyst body including a first honeycomb substrate having latticed partition walls defining a plurality of cells extending from a first inflow side end face to a first outflow side end face, and a catalyst loaded onto the first honeycomb substrate, both ends of the cells being opened, respectively;a plugged honeycomb structure including a second honeycomb substrate having latticed partition walls defining a plurality of cells extending from a second inflow side end face to a second outflow side end face, and a plurality of plugging portions arranged to plug open ends of the cells in the second inflow side end face and/or the second outflow side end face in accordance with a predetermined arrangement standard; anda can member formed to receive the honeycomb catalyst body and the plugged honeycomb structure at a downstream position of the honeycomb catalyst body, and including an exhaust gas inflow portion in which an inflow port is disposed at a position to face the first inflow side end face of the honeycomb catalyst body and into which an exhaust gas of a purification target flows, and an exhaust gas emitting portion in which an emission port is disposed at a position to face the second outflow side end face of the plugged honeycomb structure and from which the purified gas is emitted,wherein the plugged ...

Catalysts for gasoline engine exhaust gas treatments

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component and a first oxygen storage capacity (OSC) material, wherein the first catalytic region has a washcoat porosity of less than 50%; and wherein the first OSC material has a pore: volume of at least 0.4 mL/g.

METHOD FOR TRAPPING AND DECONTAMINATING A GASEOUS MEDIUM IN THE PRESENCE OF A MONOLITH COMPRISING TiO2 AND SILICA

Method for treating a gaseous feedstock containing molecular oxygen and one or more volatile compounds, which method comprises the following steps: a) bringing said gaseous feedstock containing molecular oxygen and one or more volatile organic compounds into contact with a monolith comprising silica and titanium dioxide, said monolith comprising a type-I macropore volume, of which the diameter of the pores is greater than 50 nm and less than or equal to 1000 nm, of between from 0.1 to 3 ml/g, and a type-II macropore volume, of which the diameter of the pores is greater than 1 μm and less than or equal to 10 μm, of between from 1 to 8 ml/g; b) irradiating said monolith with at least one irradiation source producing at least one wavelength lower than 400 nm in order to convert said volatile organic compounds into carbon dioxide, said step b) being carried out at a temperature between −30° C. and +200° C. and at a pressure between 0.01 MPa and 70 MPa.

Composite Material

A composite material comprises a macroporous silicate-based material at least partially substituted with at least one microporous zeolite, wherein the microporous zeolite is functionalised with either copper, iron or both copper and iron, and wherein the composite material is in the form of particles. The composite material can be obtained using a method comprising the steps of: (i) providing a mixture comprising a silicate-containing scaffold having a macroporous structure, an aluminium source and an organic template; (ii) hydrothermally treating the mixture to form a microporous zeolite-containing structure substantially retaining the macroporous structure of the silicate-containing scaffold; (iii) incorporating copper, iron or both copper and iron into the zeolite. The silicate-containing scaffold can be a diatomaceous earth. 1. A method for the manufacture of a zeolite-containing structure , the method comprising:(i) providing a mixture comprising a silicate-containing scaffold having a macroporous structure, an aluminium source and an organic template;ii) hydrothermally treating the mixture to form a microporous zeolite-containing structure substantially retaining the macroporous structure of the silicate-containing scaffold;iii) incorporating copper, iron or both copper and iron into the zeolite.2. The method of claim 1 , wherein the zeolite has a ratio of silica to alumina of 10:1 to 50:1 claim 1 , and the silicate-containing scaffold is essentially the sole source of silicon atoms for the zeolite structure.3. The method of claim 1 , wherein the microporous zeolite comprises chabazite.4. The method of claim 1 , wherein the silicate-containing scaffold comprises one or more of porous glass claim 1 , silica gel claim 1 , and a diatomaceous earth claim 1 , preferably wherein the silicate-containing scaffold comprises a diatomaceous earth.5. The method of claim 1 , wherein the silicate-containing scaffold comprises a cylindrical structure.6. The method of claim 1 ...

Selective ammonia oxidation catalyst

The invention relates to a selective ammonia oxidation catalysts comprising a platinum group metal and a support comprising TiO2 doped with 0-10% by weight of SiO2, WO3, ZrO2, Y2O3, La2O3, or a mixture thereof. The invention further comprises methods for the manufacture of the selective ammonia oxidation catalysts, and integrated catalyst systems comprising the selective ammonia oxidation catalysts for treating an exhaust gas stream.

POROUS CATALYST WASHCOATS

Catalyst washcoats with improved porosity and methods for making the washcoats are provided. The process comprises incorporation of an oil-in-water macroemulsion into the catalyst slurry prior to washcoating the carrier substrate, and calcining the washcoated carrier substrate to remove the oil-in-water macroemulsion. Also provided are catalyst articles comprising the washcoat and methods for abatement of exhaust gas emissions. 1. A catalyst article comprising a catalyst washcoat on a carrier substrate , wherein about 30%-100% of pores within the catalyst washcoat are about 15 μm-100 μm in size in at least one dimension.2. The catalyst article of claim 1 , wherein about 70%-100% of the pores within the catalyst washcoat are about 15 μm-100 μm in size in at least one dimension.3. The catalyst article of claim 1 , wherein about 70%-100% of the pores within the catalyst washcoat are about 15 μm-50 μm in size in at least one dimension.4. The catalyst article of claim 1 , wherein the carrier substrate is cordierite or metal.5. The catalyst article of claim 1 , wherein the catalyst washcoat comprises a precious group metal catalyst and/or a base metal catalyst.6. The catalyst article of claim 5 , wherein the precious group metal catalyst and/or base metal catalyst is impregnated on a support material.716-. (canceled)17. A system for abatement of exhaust gas emissions comprising a source of exhaust gases in fluid flow communication with a catalyst article according to claim 1 , and at least one of a soot filter claim 1 , a catalyzed soot filter and a second catalyst article in fluid flow communication with the catalyst article.18. The system of claim 17 , wherein the carrier substrate is a ceramic or metal honeycomb substrate.19. The system of claim 18 , wherein the carrier substrate is a flow-through monolithic substrate or a wall flow substrate. The invention relates to the field of catalyst washcoats and methods of making catalyst washcoats. The invention also relates ...

HYDROGEN-ASSISTED INTEGRATED EMISSION CONTROL SYSTEM

The invention provides an emission control system for treatment of an exhaust gas stream that includes an oxidation catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream; at least one selective catalytic reduction (SCR) composition disposed on a substrate downstream from the oxidation catalyst composition, and a hydrogen injection article configured to introduce hydrogen into the exhaust gas stream upstream of the oxidation catalyst composition or downstream of the oxidation catalyst composition and upstream of the at least one SCR composition. The invention also provides a method of treating an exhaust gas stream, the method including receiving the exhaust gas stream into the emission control system of the invention and intermittently introducing hydrogen upstream of the oxidation catalyst article or downstream of the oxidation catalyst article and upstream stream of the SCR article. 1. An emission control system for treatment of an exhaust gas stream , comprising:an oxidation catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream;at least one selective catalytic reduction (SCR) composition disposed on a substrate downstream from the oxidation catalyst composition; anda hydrogen injection article configured to introduce hydrogen into the exhaust gas stream upstream of the oxidation catalyst composition or downstream of the oxidation catalyst composition and upstream of the at least one SCR composition.2. The emission control system of claim 1 , wherein the substrate supporting the at least one SCR composition is a flow-through monolith or a monolithic wall-flow filter.3. The emission control system of claim 1 , wherein the at least one SCR composition is selected from the group consisting of a base metal-containing molecular sieve claim 1 , a platinum group metal component dispersed on a refractory metal oxide support claim 1 , and combinations thereof.4. The emission control system ...

EXHAUST GAS PURIFICATION CATALYST

The present invention provides an exhaust gas purification catalyst provided with: a substrate of wall flow structure in which inlet cells and outlet cells are partitioned by porous partition walls; and a catalyst layer disposed at least inside the partition wall and including a catalyst body. The catalyst layer satisfies the following conditions: (1) the pore volume of pores no larger than 5 μm, as measured in accordance with a mercury intrusion technique, is 24000 mmor greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 μmto 4.4 μm. 1. An exhaust gas purification catalyst disposed in an exhaust path of an internal combustion engine and configured to purify exhaust gas emitted by the internal combustion engine , the exhaust gas purification catalyst comprising:a substrate of wall flow structure where an inlet cell in which an exhaust gas inflow end section is open and an exhaust gas outflow end section is closed, and an outlet cell in which an exhaust gas outflow end section is open and an exhaust gas inflow end section is closed, are partitioned by a porous partition wall; anda catalyst layer disposed at least inside the partition wall and including a catalyst body,wherein the catalyst layer satisfies the following conditions:{'sup': '3', '(1) in a relationship between a pore size and a pore volume based on a pore distribution measured in accordance with a mercury intrusion technique, the pore volume of pores no larger than 5 μm is 24000 mmor greater per L of volume of the substrate; and'}{'sup': 2', '2, '(2) a permeability coefficient measured by a Perm porometer is 0.6 μmto 4.4 μm.'}2. The exhaust gas purification catalyst according to claim 1 , wherein the permeability coefficient is 1.9 μmor larger.3. The exhaust gas purification catalyst according to claim 2 , wherein the permeability coefficient is 2.4 μmor smaller.4. The exhaust gas purification catalyst according to claim 1 , wherein the pore ...

Low-temperature oxidation catalyst with particularly marked hydrophobic properties for the oxidation of organic pullutants

The present invention relates to a catalyst comprising a macroporous noble metal-containing zeolite material and a porous SiO 2 -containing binder, wherein the catalyst has a proportion of micropores of more than 70%, based on the total pore volume of the catalyst. The invention is additionally directed to a process for preparing the catalyst and to the use of the catalyst as an oxidation catalyst.

Exhaust gas purification catalyst

When the amount of coating is increased in a two-layer catalyst or the like containing two noble metals in respective different layers, gas diffusivity in the catalyst and use efficiency of a catalytic active site are reduced to thereby reduce purification performance. In view of this, an organic fiber having a predetermined shape is used as a pore-forming material in formation of an uppermost catalyst coating layer of a multi-layer catalyst, to thereby form an uppermost catalyst coating layer having a high-aspect-ratio pore excellent in connectivity and therefore excellent gas diffusivity.

EXHAUST SYSTEM

An exhaust system for an internal combustion engine, the exhaust system comprising, a lean NOtrap, a NOstorage and reduction zone on a wall flow monolithic substrate having a pre-coated porosity of 50% or greater, the NOstorage and reduction zone comprising a platinum group metal loaded on one or more first support, the or each first support comprising one or more alkaline earth metal compound, and a selective catalytic reduction zone on a monolithic substrate, the selective catalytic reduction zone comprising copper or iron loaded on a second support, the second support comprising a molecular sieve. 1. An exhaust system for an internal combustion engine , the exhaust system comprising ,{'sub': 'x', 'a. a lean NOtrap,'}{'sub': x', 'x, 'b. a NOstorage and reduction zone on a wall flow monolithic substrate having a pre-coated porosity of 50% or greater, the NOstorage and reduction zone comprising a platinum group metal loaded on one or more first support, the or each first support comprising one or more alkaline earth metal compound, and'}c. a selective catalytic reduction zone on a monolithic substrate, the selective catalytic reduction zone comprising copper or iron loaded on a second support, the second support comprising a molecular sieve.2. An exhaust system according to claim 1 , wherein the NOx storage and reduction zone is on a first wall flow monolithic substrate and the selective catalytic reduction zone is on a second monolithic substrate.3. An exhaust system according to claim 1 , wherein the NOstorage and reduction zone and the selective catalytic reduction zone are each on portions of the same wall flow monolithic substrate.4. An exhaust system according to claim 3 , wherein the NOstorage and reduction zone is disposed in channels of the wall flow monolithic substrate from one end thereof and the selective catalytic reduction zone is disposed in channels of the wall flow monolithic substrate from the other end thereof.5. An exhaust system according to ...

CATALYST HAVING SCR-ACTIVE COATING

The invention relates to a catalyst, which comprises a catalyst substrate of the length L and two SCR-catalytically active materials A and B, wherein the SCR-catalytically active material A contains a zeolite of the levyne structure type, which contains ion-exchanged iron and/or copper, and the SCR-catalytically active material B contains a zeolite of the chabazite structure type, which contains ion-exchanged iron and/or copper, wherein (i) the SCR-catalytically active materials A and B are in the form of two material zones A and B, wherein material zone A extends from the first end of the catalyst substrate at least over part of the length L and material zone B extends from the second end of the catalyst substrate at least over part of the length L, or wherein (ii) the catalyst substrate is formed by the SCR-catalytically active material A or B and a matrix component and the SCR-catalytically active material B or A extends at least over part of the length L of the catalyst substrate in the form of a material zone B or A. 1. A catalyst that comprises a catalyst substrate of length L and two SCR-catalytically active materials A and B that differ from each other ,wherein the SCR-catalytically active material A comprises a zeolite of the levyne structure type that contains ion-exchanged iron and/or copper, and the SCR-catalytically active material B comprises a zeolite of the chabazite structure type that contains ion-exchanged iron and/or copper, wherein(i) the SCR-catalytically active materials A and B are present in the form of two material zones A and B, wherein material zone A proceeding from the first end of the catalyst substrate extends at least over a part of the length L and material zone B proceeding from the second end of the catalyst substrate extends at least over part of the length L,or wherein(ii) the catalyst substrate is formed from the SCR-catalytically active material A and a matrix component, and the SCR-catalytically active material B extends in ...

Porous material, honeycomb structure, and method of producing porous material

A porous material includes an aggregate, and a binding material that binds the aggregate together in a state where pores are formed. The porous material contains 0.1 to 10.0 mass % of an MgO component, 0.5 to 25.0 mass % of an Al 2 O 3 component, and 5.0 to 45.0 mass % of an SiO 2 component with respect to the mass of the whole porous material, and further contains 0.01 to 5.5 mass % of an Sr component in terms of SrO.

EXHAUST GAS PURIFICATION SYSTEM, CATALYST, AND EXHAUST GAS PURIFICATION METHOD

An exhaust gas purification system which is capable of purifying exhaust gas without a noble metal being carried, and maintaining exhaust gas purification performance even at high temperatures; a catalyst; and an exhaust gas purification method are disclosed. A foamed metal catalyst which is made of a transition metal element excepting platinum group elements and is formed of a metal having a porosity of not less than 80%, and which reduces NOx by being brought into contact with an exhaust gas having a hydrogen concentration of not less than a predetermined concentration (e.g., 2%) and a temperature of not less than 230° C., is provided in an exhaust gas passage of an internal combustion engine that discharges the exhaust gas. 1. An exhaust gas purification system , comprising:a heat engine that discharges exhaust gas; anda catalyst which is made of a transition metal element excepting platinum group elements, and is formed of a metal having a porosity of not less than 80%, the catalyst being provided in an exhaust gas passage of the heat engine to reduce NOx by being brought into contact with exhaust gas having a reducing gas concentration of not less than a predetermined concentration and a temperature of not less than 230° C.2. The exhaust gas purification system according to claim 1 , whereinthe reducing gas is hydrogen, and the exhaust gas purification system further comprises hydrogen concentration adjustment means for adjusting a hydrogen concentration of exhaust gas discharged from the heat engine to be not less than the predetermined concentration and feed the same to the catalyst.3. The exhaust gas purification system according to claim 1 , whereinthe heat engine comprises, in an exhaust gas passage, a turbocharger having a turbine, and a three-way catalyst arranged in an exhaust gas downstream side of the turbine, andthe catalyst is arranged in an exhaust gas upstream side of the three-way catalyst.4. The exhaust gas purification system according to claim ...

CATALYZED SCR FILTER AND EMISSION TREATMENT SYSTEM

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. 1. A catalyst article consisting essentially of a wall flow monolith and a catalytic material , wherein the wall flow monolith has a plurality of longitudinally extending passages fatined by longitudinally extending walls bounding and defining said passages , wherein the passages comprise inlet passages having an open inlet end and a closed outlet end , and outlet passages having a closed inlet end and an open outlet end , the wall flow monolith has a porosity of from 50% to 60% and an average pore size of from 10 to 25 microns , and the wall flow monolith contains the catalytic material;{'sup': '3', 'wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from one or more of a copper and iron component, the washcoat permeating the walls at a loading up to 2.4 g/in, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.'}2. The catalyst article of claim 1 , wherein the SCR catalyst composition permeates the walls of the monolith at a concentration of at least 1.3 g/in.3. The catalyst article of claim 2 , wherein there is from 1.6 to 2.4 g/inof SCR catalyst composition disposed on the wall flow monolith.4. The catalyst article of claim 1 , wherein the SCR catalyst composition is effective to catalyze the reduction of NOx at a temperature below about 600° C. and is able to aid in regeneration of the wall flow monolith by lowering the temperature at which soot captured by the wall flow monolith is combusted.5. The catalyst article of ...

A COMPOSITION COMPRISING A ZEOLITIC MATERIAL SUPPORTED ON A SUPPORT MATERIAL

A composition comprising a support material which comprises silicon carbide on the surface of which a zeolitic material of the AEI/CHA family is supported, wherein at least 99 weight-% of the framework structure of the zeolitic material consist of a tetravalent element Y which is one or more of Si, Ge, Ti, Sn and V; a trivalent element X which is one or more of Al, Ga, In, and B; O; and H. 1. A composition , comprising a support material comprising silicon carbide ,wherein, on a surface of the support material, a zeolitic material of the AEI/CHA family is supported,wherein at least 99 weight-% of a framework structure of the zeolitic material consists of: a tetravalent element Y which is one or more of Si, Ge, Ti, Sn and V; a trivalent element X which is one or more of Al, Ga, In, and B; O; and H.2. The composition of claim 1 , wherein the silicon carbide comprised in the support material comprises one or more of alpha silicon carbide claim 1 , beta silicon carbide claim 1 , and gamma silicon carbide.3. The composition of claim 1 , wherein at least 50 weight % of the support material consists of silicon carbide claim 1 ,wherein the support material optionally further comprises one or more of elemental silicon and silica.4. The composition of claim 1 , wherein the zeolitic material of the AEI/CHA family is a zeolitic material having framework type AEI or having framework type CHA.5. The composition of claim 1 , wherein the zeolitic material of the AEI/CHA family is a zeolitic material having framework type CHA.6. The composition of claim 1 , having one or more of the following characteristics:{'sup': '2', 'a BET specific surface area in a range of from 100 to 300 m/g;'}{'sup': '2', 'a specific micropore surface area in a range of from 100 to 250 m/g;'}{'sup': '2', 'an external surface area in a range of from 2 to 10 m/g;'}{'sup': '3', 'a total pore volume in a range of from 0.05 to 0.20 cm/g;'}{'sup': '3', 'a micropore volume in a range of from 0.04 to 0.15 cm/g;'}{' ...

CERAMIC COMPOSITIONS

A ceramic precursor composition suitable for sintering form a ceramic material or structure therefrom, for example, a ceramic honeycomb structure, a ceramic material or structure, for example, a ceramic honeycomb structure obtainable by sintering said ceramic precursor composition, a method for preparing said ceramic precursor composition and ceramic material or structure, for example, ceramic honeycomb structure, a diesel particulate filter comprising said ceramic structure, a selective diesel particulate filter comprising said ceramic structure, a gasoline particulate filter comprising said ceramic structure, a vehicle comprising said diesel particulate filter, selective diesel particulate filter or gasoline particulate filter, and a SCR catalyst system comprising said ceramic material or structure. 1. A ceramic precursor composition having at least a trimodal particle size distribution , the ceramic precursor composition comprising:(a) a first inorganic particulate material having a coarse particle size distribution;(b) a second inorganic particulate material having a particle size distribution which is finer than (a);{'sub': '50', '(c) a third inorganic particulate material having a dof equal to or less than about 5 μm and optionally having a particle size distribution which is finer than (b); and'}(d) at least one pore forming agent.2. A ceramic composition according to claim 1 , wherein the pore forming agent is present in an amount suitable to obtain a ceramic material having a porosity of at least about 50% (calculated on the basis of the total volume of the mineral phases and pore space of the ceramic material).3. A ceramic precursor composition according to claim 1 , wherein:{'sub': '50', 'the first inorganic particulate material has a dof from about 20 μm to about 80 μm;'}{'sub': '50', 'the second inorganic particulate material has a dof from about 1.0 μm to about 20 μm; and'}the third inorganic particulate material has a particle size distribution finer ...

CATALYTICALLY ACTIVE MATERIAL, METHOD FOR PRODUCING SAME, AND USE THEREOF

A catalytically active material is provided. The material includes a mixed oxide having a first metal selected from group 4 of the periodic table of elements and/or a second metal, and at least one further metal selected from group 11 of the periodic table of elements, wherein the macroscopic composition of the material given by the chemical formula corresponds to the composition of the material at a molecular level. A coating made of such a material is also provide, as is an article having such a coating, and a method for producing such a material. 2. The catalytically active material of claim 1 , wherein the ratio Vis between 1 and 1:3.31. The catalytically active material of claim 1 , wherein the first metal (M) comprises titanium and/or zirconium.42. The catalytically active material of claim 1 , wherein the second metal (M) comprises a lanthanide.52. The catalytically active material of claim 1 , wherein the second metal (M) comprises cerium.63. The catalytically active material of claim 1 , wherein the third metal (M) is copper.712. The catalytically active material of claim 1 , further comprising an atomic ratio of the first metal (M) to the second metal (M) of 1:4.8. The catalytically active material of claim 1 , comprising claim 1 , at least in part claim 1 , a nanocrystalline fraction claim 1 , wherein the nanocrystalline fraction is greater than 25 vol %.9. The catalytically active material of claim 8 , wherein the nanocrystalline fraction comprises nanocrystals having a crystallite size from 4 to 50 nm claim 8 , wherein the crystallite size is specified as a mean diameter of the crystallites.10. The catalytically active material of claim 8 , further comprising a granular structure in which nanocrystals of the nanocrystalline fraction do not have a preferred orientation so that the nanocrystals are randomly distributed.11. The catalytically active material of claim 1 , further comprising a temperature resistance of at least 600° C.12. The catalytically ...

CATALYST COMPOSITE AND USE THEREOF IN THE SELECTIVE CATALYTIC REDUCTION OF NOx

The present invention relates to a process for the preparation of a catalyst for selective catalytic reduction comprising• (i) preparing a mixture comprising a metal-organic framework material comprising an ion of a metal or metalloid selected from groups 2-5, groups 7-9, and groups 11-14 of the Periodic Table of the Elements, and at least one at least monodentate organic compound, a zeolitic material containing a metal as a non-framework element, optionally a solvent system, and optionally a pasting agent,• (ii) calcining of the mixture obtained in (i); and further relates to a catalyst per se comprising a composite material containing an amorphous mesoporous metal and/or metalloid oxide and a zeolitic material, wherein the zeolitic material contains a metal as non-framework element, as well as to the use of said catalyst.

Catalyzed SCR Filter and Emission Treatment System

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia.

MIXED OXIDE BASED ON CERIUM AND ZIRCONIUM

A mixed oxide, a catalytic composition, a catalytic wall-flow monolith, the use of the mixed oxide and the process of the preparation of the mixed oxide. The mixed oxide comprises zirconium, cerium, lanthanum and optionally at least one rare earth element other than cerium and other than lanthanum. The catalytic composition and the wall-flow monolith comprise the particles of the mixed oxide. The use of the mixed oxide is in the preparation of a coating on a filter. The process of preparation of the mixed oxide consists jet milling. The mixed oxide is a compromise between a calibrated size and a low viscosity when in the form of an aqueous slurry while retaining a high specific surface area and a high pore volume. 139-. (canceled)43. Mixed oxide according to comprising also hafnium claim 40 , the proportion of hafnium in the mixed oxide being more particularly lower than or equal to 2.5% claim 40 , this proportion being given by weight of oxide relative to the mixed oxide as a whole.44. Mixed oxide according to wherein the proportion of cerium is between 8.0% and 45.0%.45. Mixed oxide according to wherein the proportion of cerium is between 18.0% and 37.0%.46. Mixed oxide according to wherein the proportion of lanthanum is between 1.0% and 15.0%.47. Mixed oxide according to wherein the proportion of the rare earth element(s) is comprised between 0% and 15.0%.48. Mixed oxide according to wherein the proportion of zirconium is higher than 45%.49. Mixed oxide according to comprising a weight ratio ZrO/CeO>1.0.50. Mixed oxide according to wherein d50 is strictly less than 2.5 μm.51. Mixed oxide according to wherein the particles exhibit a d10 lower than or equal to 1.0 μm.52. Mixed oxide according to wherein the particles exhibit a d10 higher than or equal to 0.2 μm.53. Mixed oxide according to wherein the particles exhibit a d99 lower than or equal to 20.0 μm.54. Mixed oxide according to wherein the particles exhibit a d99 higher than or equal to 5.0 μm.55. Mixed oxide ...

POROUS CARBON MATERIAL COMPOSITES AND THEIR PRODUCTION PROCESS, ADSORBENTS, COSMETICS, PURIFICATION AGENTS, AND COMPOSITE PHOTOCATALYST MATERIALS

A porous carbon material composite formed of a porous carbon material and a functional material and equipped with high functionality. The porous carbon material composite is formed of (A) a porous carbon material obtainable from a plant-derived material having a silicon (Si) content of 5 wt % or higher as a raw material; and (B) a functional material adhered on the porous carbon material, and has a specific surface area of 10 m/g or greater as determined by the nitrogen BET method and a pore volume of 0.1 cm/g or greater as determined by the BJH method and MP method. 111.-. (canceled)12. A porous carbon material composite comprising:{'sup': 2', '3, '(A) a porous carbon material obtainable from a plant-derived material having a silicon content of 5 wt % or higher as a raw material, the porous carbon material composite having a specific surface area of 10 m/g or greater as determined by the nitrogen BET method and a pore volume of 0.1 cm/g or greater as determined by the BJH method and MP method; and'}(B) a functional material adhered on the porous carbon material, the functional material comprising an oxide semiconductor or a compound semiconductor.13. The porous carbon material composite according to claim 12 , wherein the functional material has a photocatalytic property.14. The porous carbon material composite according to claim 12 , wherein the functional material is titanium oxide or zinc oxide.159. The porous carbon material composite according to claim claim 12 , wherein the functional material is cadmium sulfide claim 12 , lead sulfide claim 12 , cadmium selenide claim 12 , lead selenide claim 12 , zinc selenide claim 12 , indium arsenide claim 12 , gallium arsenide claim 12 , indium phosphide claim 12 , gallium phosphide claim 12 , gallium antimonide claim 12 , indium antimonide claim 12 , or lanthanide oxide.16. The porous carbon material composite according to claim 12 , wherein the porous carbon material composite has a specific surface area of 50 m/g or ...

Honeycomb filter

A honeycomb filter includes a honeycomb structure having a porous partition wall disposed to surround a plurality of cells; and a plugging portion provided at one end of the cell, wherein the honeycomb structure has an inflow side region including a range of up to at least 30% with respect to the total length of the honeycomb structure with the inflow end face as the starting point and an outflow side region including a range of up to at least 20% with respect to the total length of the honeycomb structure with the outflow end face as the starting point, in the extending direction of the cell of the honeycomb structure, an average pore diameter of the partition wall in the inflow side region is 9 to 14 μm and an average pore diameter of the partition wall in the outflow side region is 15 to 20 μm.

Porous Bodies and Methods

Systems and methods for treating a fluid with a body are disclosed. Various aspects involve treating a fluid with a porous body. In select embodiments, a body comprises ash particles, and the ash particles used to form the body may be selected based on their providing one or more desired properties for a given treatment. Various bodies provide for the reaction and/or removal of a substance in a fluid, often using a porous body comprised of ash particles. Computer-operable methods for matching a source material to an application are disclosed. Certain aspects feature a porous body comprised of ash particles, the ash particles have a particle size distribution and interparticle connectivity that creates a plurality of pores having a pore size distribution and pore connectivity, and the pore size distribution and pore connectivity are such that a first fluid may substantially penetrate the pores. 1. An engine control system configured to operate an engine , the engine control system comprising a processor and a computer-readable , non-transitory storage medium having embodied thereon instructions executable by the processor to perform a method comprising:predicting an expected duty cycle having an expected demand from the engine;calculating two or more future operating conditions, each future operating condition including engine control parameters that, when used to control the engine, are expected to result in the engine meeting the expected demand;selecting one of the calculated future operating conditions; andadjusting a present operation of the engine in response to the selected future operating condition.2. The system of claim 1 , wherein at least one of:predicting the expected duty cycle;calculating the two or more future operating conditions;selecting one of the calculated future operating conditions; and a least squares optimization;', 'a monte carlo optimization;', 'a steepest descent optimization; and', 'a parallel tempering optimization., 'adjusting the ...

DIRT SEPARATOR FOR A VACUUM CLEANER

A dirt separator including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber, and a disc located at the outlet, the disc being arranged to rotate about a rotational axis and including holes through which the cleansed fluid passes. The holes are distributed over at least first and second regions of the disc, the second region being radially outward of the first region. The porosity of the second region is higher than the porosity of the first region. 1. A dirt separator for a vacuum cleaner , the dirt separator comprising:a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber; anda disc located at the outlet, the disc being arranged to rotate about a rotational axis and comprising holes through which the cleansed fluid passes, wherein:the holes are distributed over at least first and second regions of the disc, the second region being radially outward of the first region; andthe porosity of the second region is higher than the porosity of the first region.2. The dirt separator of claim 1 , wherein:the holes are distributed over a third region as well as the first and second regions, the third region being radially outward of the second region; andthe porosity of the third region is higher than the porosity of the second region.3. The dirt separator of claim 1 , wherein the porosity of the disc increases substantially continually across substantially the entire radial extent of the disc over which the holes are provided.4. The dirt separator of claim 1 , wherein the porosity of the second region is at least 20% larger than the porosity of the first region.5. The dirt separator of claim 4 , wherein the porosity of the second region is at least 60% larger than the porosity of the first region.6. The dirt separator according to any preceding of claim 1 , wherein when viewed normal to the disc claim 1 , ...

Catalyzed SCR Filter and Emission Treatment System

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia.

ZEOLITE CATALYST AND METHOD FOR PRODUCING LOWER OLEFIN

A CON zeolite satisfying the following () to ():() The framework is CON as per the code specified by the International Zeolite Association (IZA); and () It contains silicon and aluminum, and the molar ratio of aluminum to silicon is 0.04 or more. 1. A CON zeolite , silicon and aluminum in a molar ratio of aluminum to silicon of 0.04 or more and 0.30 or less and the framework is CON as per the code specified by the International Zeolite Association (IZA) , wherein the CON zeolite consists essentially of a crystal of polymorph B ,wherein the CON zeolite is obtained by hydrothermal synthesis of a mixture comprising a silicon source, an aluminum source, an alkali metal element source and/or an alkaline earth metal element source, an organic structure-directing agent comprising N,N,N-trimethyl-(−)-cis-myrtanylammonium cation and/or N,N,N-trimethyl-(+)-cis-myrtanylammonium cation, and water, wherein the molar ratio of aluminum to silicon in the mixture is higher than 0.01, the molar ratio of the sum of an alkali metal and alkaline earth metal to silicon in the mixture is 0.20 or more.2. The CON zeolite according to claim 1 , wherein the molar ratio of aluminum to silicon is higher than 0.08.3. A method of producing a zeolite of the type CON as per the code specified by the International Zeolite Association (IZA) by hydrothermal synthesis of a mixture comprising a silicon source claim 1 , an aluminum source claim 1 , an alkali metal element source and/or an alkaline earth metal element source claim 1 , an organic structure-directing agent comprising N claim 1 ,N claim 1 ,N-trimethyl-(−)-cis-myrtanylammonium cation and/or N claim 1 ,N claim 1 ,N-trimethyl-(+)-cis-myrtanylammonium cation claim 1 , and water claim 1 , wherein the molar ratio of aluminum to silicon in the mixture is higher than 0.01 claim 1 , the molar ratio of the sum of an alkali metal and alkaline earth metal to silicon in the mixture is 0.20 or more.4. The method of producing a CON zeolite according to ...

HONEYCOMB BODIES WITH TRIANGULAR CELL HONEYCOMB STRUCTURES AND MANUFACTURING METHODS THEREOF

A honeycomb structure having a cellular honeycomb matrix of intersecting porous walls forming cell channels with triangular cross-sectional shapes and filleted vertices in the triangular cross-sectional shapes. The porous walls include % P≥40% and MPD>8 μm. The matrix includes a cell channel density of 150 cpsi to 600 cpsi (23.3 cpscm to 93 cpscm) and wall thicknesses of between 2 mils and 12 mils (between 51 μm to 300 μm). Honeycomb extrusion dies and methods of manufacturing the honeycomb body having triangular-shaped cell channels are provided, as are other embodiments. 1. A honeycomb body comprising: % P≥40%; and', 'MPD>8 μm; and, 'a cellular honeycomb matrix of intersecting porous walls forming cell channels with triangular cross-sectional shapes and filleted vertices in the triangular cross-sectional shapes, the intersecting porous walls comprising a cell channel density of 150 cpsi to 600 cpsi; and', 'wall thickness of between 2 mils and 12 mils., 'the cellular honeycomb matrix comprising2. The honeycomb body of claim 1 , wherein the filleted vertices comprise corner radii that are greater than or equal to 0.001 inch.3. The honeycomb body of claim 1 , further comprising a wash coat applied to the intersecting porous walls.4. The honeycomb body of claim 3 , wherein the wash coat is predominantly carried in the intersecting porous walls.5. The honeycomb body of claim 1 , wherein one or more cell channels have a hydraulic diameter of 1.00 mm or greater.6. The honeycomb body of claim 1 , wherein the wall thickness is less than 0.006 inch.7. The honeycomb body of claim 1 , comprising an open frontal area of 83% or more.8. The honeycomb body of claim 1 , comprising a 40%≤% P≤70%.9. The honeycomb body of claim 1 , comprising an 8 μm Подробнее

THREE WAY CATALYST HAVING AN NH3-SCR ACTIVITY, AN AMMONIA OXIDATION ACTIVITY AND AN ADSORPTION CAPACITY FOR VOLATILE VANADIUM AND TUNGSTEN COMPOUNDS

Three way catalyst having an NH-SCR activity, an ammonia oxidation activity and an adsorption capacity for volatile vanadium and tungsten compounds volatilized off an upstream SCR active catalyst. 1. Three way catalyst having an NH3-SCR activity , an ammonia oxidation activity and an adsorption capacity for volatile vanadium and tungsten compounds volatilized off an upstream SCR active catalyst , the three way catalyst comprising high surface compounds selected from high surface metal oxides , zeolites , silica , non-zeolite silica alumina , and mixtures thereof.2. The three way catalyst of claim 1 , wherein the three way catalyst comprising a bottom layer comprising platinum claim 1 , alumina and/or titania and optionally palladium coated on a substrate or partly or entirely forming the substrate and a top layer comprising oxides of vanadium claim 1 , tungsten and titanium admixed with at least one of a high surface coria claim 1 , alumina claim 1 , silica claim 1 , zirconia claim 1 , non-zeolite silica alumina and zeolite.3. The three way catalyst of claim 2 , wherein the top layer has layer thickness of between 40 μm and 250 μm.4. The three way catalyst of claim 2 , wherein the bottom layer has a layer thickness of between 5 μm and 450 μm.5. The three way catalyst of claim 2 , wherein the top layer has a porosity of between 20% and 80%.6. The three way catalyst according to claim 1 , wherein the three way catalyst is coated on a substrate with a flow through monolith shape.7. The three way catalyst according to claim 2 , wherein the amount of the top layer in the three way catalyst is between 50 to 500 g per liter of the substrate.8. The three way catalyst according to claim 2 , wherein the amount of the bottom layer in the three way catalyst is between 5 and 255 g per liter of the substrate.9. The three way catalyst according to claim 2 , wherein the bottom layer of the three way catalyst contains 0.0018 g-0.35 g platinum and/or palladium per liter of the ...

Mixed cerium- and zirconium-based oxide

The present invention relates to a mixed oxide of aluminium, of zirconium, of cerium, of lanthanum and optionally of at least one rare-earth metal other than cerium and lanthanum that makes it possible to prepare a catalyst that retains, after severe ageing, a good thermal stability and a good catalytic activity. The invention also relates to the process for preparing this mixed oxide and also to a process for treating exhaust gases from internal combustion engines using a catalyst prepared from this mixed oxide.

METHODS FOR GAS PHASE OXIDATIVE DESULPHURIZATION OF HYDROCARBONS USING CuZnAl CATALYSTS PROMOTED WITH GROUP VIB METALS

A catalytic composition is disclosed, which exhibits an X-ray amorphous oxide with a spinel formula, and crystals of ZnO, CuO, and at least one Group VIB metal oxide, and preferably, at least one acidic oxide of B, P. or Si, as well. The composition is useful in oxidative processes for removing sulfur from gaseous hydrocarbons. 1. A method for oxidizing sulfur in a sulfur containing hydrocarbon , comprising contacting a gaseous hydrocarbon to a catalytic composition , comprising copper oxide in an amount ranging from 10 weight percent (wt. %) to 50 wt. % , zinc oxide in an amount ranging from 5 wt. % to less than 20 wt. % , aluminum oxide in an amount ranging from 20 wt. % to 70 wt. % , and at least one promoter selected from the group consisting of a Group VIB metal oxide , wherein said catalytic composition has an X-ray amorphous oxide phase with a formula CuZnAlOwherein x ranges from 0 to 1 , crystalline ZnO and CuO in the presence of an oxygen containing gas.2. The method of claim 1 , wherein said promoter is Mo or W.3. The method of claim 1 , wherein said promoter further comprises an acidic oxide of Si claim 1 , B claim 1 , or P.4. The method of claim 1 , wherein said promoter is present in an amount up to 20 wt. % of said catalyst.5. The method of claim 1 , wherein said hydrocarbon is a gaseous hydrocarbon.6. The method of claim 1 , wherein said oxygen containing gas is pure oxygen.7. The method of claim 1 , comprising oxidizing said hydrocarbon in the absence of hydrogen gas.8. The method of claim 1 , comprising oxidizing said hydrocarbon at a temperature greater than 300° C.9. The method of claim 3 , wherein said acidic oxide is BO.10. A process for making the catalytic composition of claim 1 , comprising:{'sub': 4', '2', '3', '2', '3', '4', '3, '(i) combining an aqueous solution containing each of copper nitrate, zinc nitrate, and aluminum nitrate with an alkaline solution containing NaOH and/or at least one of (NH)CO, NaCOand NHHCO, at a temperature of ...

Pgm catalyst for treating exhaust gas

Provided are catalysts comprising a small pore molecular sieve embedded with PGM and methods for treating lean burn exhaust gas using the same.

Exhaust purifying filter

Provided is an exhaust purifying filter having high catalyst purification performance and particulate matter capturing performance while reducing pressure loss. A GPF includes a filter substrate in which a plurality of cells extending from an inflow-side end surface to an outflow-side end surface are partitioned and formed by a porous partition wall and an inflow-side cell in which an opening in the outflow-side end surface is sealed and an outflow-side cell in which an opening in the inflow-side end surface is sealed are alternately disposed; and a TWC which is carried on the partition wall, wherein a difference between a total volume of pores having pore diameters within a range of 0.1 μm to 10.7 μm in pore distribution of the GPF and a total volume of pores having pore diameters within a range of 0.1 μm to 10.7 μm in pore distribution of the filter substrate is 0.015 ml/g˜0.06 ml/g.

Plugged honeycomb structure

A plugged honeycomb structure including: a pillar-shaped honeycomb structure body having porous partition walls made of a material including silicon carbide, and plugging portions, wherein a porosity of the partition walls is from 42 to 52%, a thickness of the partition walls is from 0.15 to 0.36 mm, a ratio of a volume of pores having pore diameters of 10 μm or less to a total pore volume of the partition walls is 41% or less, a ratio of a volume of pores having pore diameters in a range of 18 to 36 μm to the total pore volume is 10% or less, the pore diameter indicating a maximum value of the log differential pore volume is in a range of 10 to 16 μm, and a half-value width of a peak including the maximum value of the log differential pore volume is 5 μm or less.

POROUS STRUCTURE FOR EXHAUST GAS PURIFICATION CATALYST, EXHAUST GAS PURIFICATION CATALYST USING POROUS STRUCTURE, AND EXHAUST GAS PURIFICATION METHOD

Provided is a porous structure for exhaust purification catalysts having excellent light-off temperature characteristics. The porous structure for exhaust purification catalysts includes an oxygen storage component and an inorganic porous solid. The porous structure has a pore volume distribution such that the ratio of the pore volume of pores with a diameter of from 15 nm to less than 25 nm to the pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.3 to 2.5 as measured with a mercury porosimeter. The pore volume distribution preferably has at least one peak top in a pore diameter range of from 15 nm to less than 25 nm. 110-. (canceled)11. An exhaust gas purification catalyst comprising a substrate and a catalyst layer on the substrate ,the catalyst layer comprising an oxygen storage component and an inorganic porous solid,the exhaust gas purification catalyst having a pore volume distribution such that a ratio of a pore volume of pores with a diameter of from 15 nm to less than 25 nm to a pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.4 to 2.5 as measured with a mercury porosimeter,the pore volume distribution having at least one peak top in a pore diameter range of from 15 nm to less than 25 nm, andthe pore volume distribution having a ratio of a pore volume of pores with a diameter of from 5 nm to less than 15 nm to a pore volume of pores with a diameter of 5 to 200 nm is 15% to 35%, and a ratio of a pore volume of pores with a diameter of from 15 nm to less than 25 nm to a pore volume of pores with a diameter of 5 to 200 nm is 25% to 55%.12. The exhaust gas purification catalyst according to claim 11 , wherein the pore volume distribution has a ratio of a pore volume of pores with a diameter of from 5 nm to less than 15 nm to the total pore volume is 5% to 35% claim 11 , and a ratio of a pore volume of pores with a diameter of 15 nm to less than 25 nm to the total pore volume is 10% to 50%.13. The exhaust gas ...

Exhaust gas purification filter

[Summary] 1. Exhaust gas purification filter including a substrate comprising a plurality of porous partitions ,wherein the partitions form an exhaust gas flow path,a porous catalytic layer is provided on the partitions and the catalytic layer having a thickness of 10 μm or greater is provided over at least 20% of the total length of the partitions in the lengthwise direction thereof, andthe catalytic layer having a thickness of 10 μm or greater is not present on the partitions 15 mm from an outflow side.2. Exhaust gas purification filter according to claim 1 , wherein the application amount of catalyst component forming part of the catalytic layer varies according to the specific gravity of the catalyst component and the pore volume in the catalytic layer.3. Exhaust gas purification filter according to or claim 1 , wherein the mean diameter of the pores in the catalytic layer is between 1 and 5 μm.4. Exhaust gas purification filter according to any one of to claim 1 , wherein the void ratio of the catalytic layer is no greater than 50%.5. Exhaust gas purification filter according to any one of to claim 1 , wherein the void ratio of the partitions is between 40% and 60%.6. Exhaust gas purification filter according to any one of to claim 1 , wherein the mean diameter of the pores in the partitions is between 10 μm and 20 μm.7. Exhaust gas purification filter according to any one of to claim 1 , wherein the catalyst component may include at least one of platinum and palladium claim 1 , and at least one of an alkali metal and a rare earth metal.8. Exhaust gas purification filter according to any one of to claim 1 , wherein the thickness of the catalytic layer is between 10 μm and 50 μm.9. Method for producing an exhaust gas purification filter according to any one of to claim 1 , comprising a step in which a slurry including a catalyst component and an organic pore-forming material is applied in order to form pores in a catalytic layer.10. Method for producing an ...

REACTIVE FILTER FOR MOTOR VEHICLE

Disclosed is a reactive filter, that is a selective catalytic reduction filter or an oxidative reaction filter, including a porous substrate including internal pores having their inner surface, totally or partially, directly coated with a catalytic zeolite material resulting from an in situ hydrothermal synthesis. Also disclosed is a process for preparing such a reactive filter and the use thereof in an engine exhaust depolluting system. 129-. (canceled)3051112. A reactive filter comprising a porous substrate () comprising internal pores () having their inner surface () , totally or partially , directly coated with a catalytic zeolite material resulting from an in situ hydrothermal synthesis.31. A reactive filter according to that is a selective catalytic reduction filter or an oxidative reaction filter.325. A reactive filter according to claim 30 , wherein the porous substrate () hasa porosity when coated comprised between 5 and 90% and a mean pore size comprised between 0.1 and 100 μm; and/oran intrinsic porosity comprised between 5 and 90% and an intrinsic mean pore size comprised between 0.1 and 100 μm.335. A reactive filter according to claim 30 , wherein the porous substrate () is selected from the group consisting ofceramic-like materials, ceramic materials,cordierite ceramic, α-alumina, silicon carbide, aluminium titanate, silicon nitride, zirconia, mullite, spodumene, alumina-silica-magnesia, zirconium silicate,one or more metal alloys, metal alloys, sintered metals, porous refractory metals,titanium oxide, aluminium, iron, steel, sintered carbon,stainless steel, iron alloys, nickel alloys, chromium alloys, aluminium alloys, titanium alloys.345. A reactive filter according to claim 30 , wherein the porous substrate () is in a form selected from trapezoidal forms claim 30 , rectangular forms claim 30 , square forms claim 30 , sinusoidal forms claim 30 , hexagonal forms claim 30 , oval forms claim 30 , a honeycomb structure claim 30 , a monolith structure ...

Dirt separator for a vacuum cleaner

A dirt separator for a vacuum cleaner including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber; and a disc located at the outlet, the disc being arranged to rotate about a rotational axis, and including holes running from an upstream face to a downstream face through which the cleansed fluid passes. Each hole has a tapered portion which narrows from an upstream end to a downstream end thereof.

Catalyst layer forming material, catalyst apparatus constituent material, catalyst apparatus, and methods for manufacturing the same

A novel catalyst constituent material for combustion gas purification, which has an extremely good ratio of contact between each catalyst metal particle and an exhaust gas; and catalyst device which uses this catalyst constituent material for combustion gas purification; and a method for producing this catalyst constituent material for combustion gas purificaton. The catalyst constituent obtained by mixing catalyst metal particles and a pore-forming material that disappears at high temperatures into a catalyst supporting material which is a slurry containing fine ceramic particles. The pore-forming material also contains long fibers of cellulose nanofibers and/or short fibers of cellulose nanofibers.

Process for producing a catalyst and catalyst article

A process for producing a ceramic catalyst involves the steps of: a) providing functional particles having a catalytically inactive pore former as a support surrounded by a layer of a catalytically active material, b) processing the functional particles with inorganic particles to form a catalytic composition, c) treating the catalytic composition thermally to form a ceramic catalyst, wherein the ceramic catalyst comprises at least porous catalytically inactive cells which are formed by the pore formers in the functional particles, which are embedded in a matrix comprising the inorganic particles, which form a porous structure and which are at least partly surrounded by an active interface layer comprising the catalytically active material of the layer of the functional particles. An SCR catalyst produced in by this method has an improved NO x conversion rate compared to a conventionally produced SCR catalyst.

CATALYZED SCR FILTER AND EMISSION TREATMENT SYSTEM

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. 127-. (canceled)28. A catalyst article comprising a wall flow monolith and a catalytic material contained within the wall flow monolith , wherein the wall flow monolith has a wall porosity of at least 50% and comprises a plurality of longitudinally extending passages formed by longitudinally extending porous walls bounding and defining said passages , wherein the passages comprise inlet passages having an open inlet end and a closed outlet end , and outlet passages having a closed inlet end and an open outlet end , and wherein the catalytic material comprises a zeolite and a base metal selected from copper and iron present in an amount of from about 0.1 to 30 percent by weight of the total weight of base metal plus zeolite , the zeolite having pores connected in three dimensions and a silica to alumina ratio of at least about 10 , the wall flow monolith having integrated NOx and particulate removal efficiency when exposed to diesel engine exhaust and ammonia or an ammonia precursor.29. The catalyst article of claim 28 , wherein the base metal selected from copper and iron is present in an amount of from about 1 to 5 percent by weight of the total weight of base metal plus zeolite.30. The catalyst article of claim 28 , wherein the wall flow monolith has from about 100 to 400 cells per square inch.31. The catalyst article of claim 28 , wherein the wall flow monolith has a wall thickness between 0.002 and 0.015 inches.32. The catalyst article of claim 28 , wherein the catalytic material permeates the porous walls at a concentration of 1.6 to 2.4 g/in claim 28 , and wherein the porous walls have a porosity of from 55 to 75% and an average pore ...

NITROUS OXIDE REMOVAL CATALYSTS FOR EXHAUST SYSTEMS

A nitrous oxide (NO) removal catalyst composite is provided, comprising a NO removal catalytic material on a substrate, the catalytic material comprising a rhodium (Rh) component supported on a ceria-based support, wherein the catalyst composite has a H-consumption peak of about 100° C. or less as measured by hydrogen temperature-programmed reduction (H-TPR). Methods of making and using the same are also provided. 131-. (canceled)32. A method of making a nitrous oxide (NO) removal catalyst composite , the method comprising:{'sup': '3', 'depositing a rhodium precursor onto a fresh ceria-based support having a pore volume that is at least about 0.20 cm/g and forming a washcoat therefrom;'}coating a substrate comprising a flow-through monolith or a wall-flow filter with the washcoat to form a coated substrate; andcalcining the coated substrate in air at an elevated temperature.33. The method of claim 32 , wherein the calcining step is under conditions of 750° C. for 20 hours with 10 weight % water in air.34. The method of claim 32 , further comprising:calcining the fresh ceria-based support at about 600° C. to about 800° C. before the depositing step. The present invention is directed to a purifying catalyst for exhaust systems of internal combustion engines, and methods for its use. More particularly, the invention pertains to a catalyst comprising a rhodium (Rh) component supported on a ceria-based support, wherein the catalyst is effective to remove nitrous oxide (NO) under conditions of an exhaust stream of an internal combustion engine. For example, the NO removal catalyst is effective to decompose NO to nitrogen (N) and oxygen (O) and/or to reduce NO to nitrogen and water and/or carbon dioxide (depending on the reductant present).Nitrous oxide (NO) is a greenhouse gas with a global warming potential of 310 times that of CO2 and an atmospheric lifetime of 114 years. Automotive exhaust is one source of NO emissions, as a by-product of fuel combustion and as a by- ...

EXHAUST GAS PURIFICATION CATALYST

An object of the present invention is to provide an exhaust gas purification catalyst which can exhibit sufficient purification performance even under a high Ga condition. The present invention relates to an exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in the direction of an exhaust gas flow and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region. The downstream region in the direction of an exhaust gas flow has a structure where a void is included in a large number, and furthermore high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain percentage or more of the whole volume of voids. Thus, the exhaust gas purification catalyst exhibits enhanced purification performance. 17-. (canceled)8. An exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate , wherein:the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in an exhaust gas flow direction and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region; an average thickness of the coating layer is in a range from 25 μm to 160 μm,', 'a porosity measured by a weight-in-water method is in a range from 50 to 80% by volume, and', 'high-aspect-ratio pores having an aspect ratio of 5 or more account for 0.5 to 50% by ...

LOW TEMPERATURE NOx REDUCTION USING H2-SCR FOR DIESEL VEHICLES

Disclosed herein are emission treatment systems, articles, and methods for selectively reducing NOx compounds. The systems include a hydrogen generator, a hydrogen selective catalytic reduction (H 2 -SCR) article, and one or more of a diesel oxidation catalyst (DOC) and/or a lean NOx trap (LNT) and/or a low temperature NOx adsorber (LTNA). Certain articles may comprise a zone coated substrate and/or a layered coated substrate and/or an intermingled coated substrate of one or more of the H 2 -SCR and/or DOC and/or LNT and/or LTNA catalytic compositions.

Honeycomb catalytic body

A honeycomb catalytic body including: a honeycomb structure having porous partition walls, and a catalyst layer including a vanadium catalyst, wherein a cell density of the honeycomb structure is in a range of 8 cells to 48 cells per square centimeter, an amount of the vanadium catalyst to be loaded is in a range of 150 g/L to 400 g/L, and a catalyst charging ratio represented by Equation (1) mentioned below in a cut face of the honeycomb catalytic body is from 50% to 100%. the catalyst charging ratio (%)=(the sectional area of the catalyst layer loaded onto the partition wall inner portions)/(the sectional area of the pores before the catalyst is loaded)×100.  Equation (1):

EXHAUST GAS PURIFICATION CATALYST

An object of the present invention is to provide an exhaust gas purification catalyst which can exhibit high durability and warm-up performance. The present invention relates to an exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in the direction of an exhaust gas flow and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region. The upstream region in the direction of an exhaust gas flow has a structure where a void is included in a large number, and furthermore high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain percentage or more of the whole volume of voids. Thus, the exhaust gas purification catalyst exhibits enhanced purification performance. 17-. (canceled)8. An exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate , wherein:the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in an exhaust gas flow direction and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region; an average thickness of the coating layer is in a range from 25 μm to 160 μm,', 'a porosity measured by a weight-in-water method is in a range from 50 to 80% by volume, and', 'high-aspect-ratio pores having an aspect ratio of 5 or more account for 0.5 to 50% by volume of the whole volume of ...

Zeolite catalyst and method for producing lower olefin

A zeolite catalyst capable of maintaining a high conversion of raw materials over a long period of time, and a method of producing a lower olefin stably over a long period of time using the zeolite catalyst is to be provided. A CON zeolite catalyst containing aluminum (Al) as a constituent element, wherein the CON zeolite catalyst has a ratio ((A 2 /A 1 )×100 (%)) of an integrated intensity area (A 2 ) of signal intensity in a range from 57.5 ppm to 70 ppm to an integrated intensity area (A 1 ) of signal intensity in a range from 45 ppm to 70 ppm is not less than 49.0% when analyzed by 27 Al-MAS-NMR is prepared, and a lower olefin is produced by a MTO process using the zeolite catalyst.

CARRIER FOR EXHAUST GAS PURIFICATION CATALYST, AND EXHAUST GAS PURIFICATION CATALYST

Provided is a carrier for an exhaust gas purification catalyst containing aluminum borate particles having a peak (pore peak) exhibiting the highest intensity in a void volume diameter range of from 20 nm to 100 nm in a logarithmic differential void volume distribution measured using a mercury intrusion porosimeter, in order to provide a new catalyst support capable of effectively suppressing a decrease in catalytic performance caused by sulfur (S) component contained in the exhaust gas, in the case of supporting Pd as a catalytically active component. 1. A carrier for an exhaust gas purification catalyst , comprising aluminum borate particles having a peak (also referred to as the “pore peak”) exhibiting the highest intensity in a void volume diameter range of from 20 nm to 100 nm in a logarithmic differential void volume distribution measured using a mercury intrusion porosimeter.2. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein a void having a void volume diameter of from 20 nm to 70 nm accounts for 50% or more of voids having a void volume diameter of from 10 nm to 1000 nm.3. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein the aluminum borate particles comprise lanthanum (La).4. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein a mass ratio of a content of aluminum (Al) to a content of boron (B) (mass ratio of Al/B) in the aluminum borate particles is from 6 to 35.5. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein the aluminum borate particles have a crystal structure represented by 10AlO.2BOor 9AlO.2BO.6. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein the aluminum borate particles have a crystal structure represented by 10AlO.2BOor 9AlO.2BOand a crystal structure represented by 2AlO.BO.7. The carrier for an exhaust gas purification catalyst according to claim 1 , wherein the aluminum ...

HONEYCOMB STRUCTURE

A honeycomb structure includes a honeycomb structure body including porous partition walls defining a plurality of cells serving as fluid passages extending from an inflow end face to an outflow end face. The partition walls have a porosity of 45 to 65%; the open frontal area of the pores having an equivalent circle diameter of 10 μm or more, of the pores open on the surface of each partition wall, is 20 to 50%; the pore density of the pores having an equivalent circle diameter of 10 μm or more is 200 to 1,000 pores/mm; the median opening diameter of the pores having an equivalent circle diameter of 10 μm or more is 40 to 60 μm; the circularity of the pores having an equivalent circle diameter of 10 μm or more is 1.8 to 4.0; and the partition walls have a wet area of 16,500 μmor more. 1. A honeycomb structure comprising:a honeycomb structure body including porous partition walls defining a plurality of cells serving as fluid passages extending from an inflow end face to an outflow end face;{'sup': 2', '2, 'wherein a porosity of the partition walls is from 45 to 65%, an open frontal area of pores having an equivalent circle diameter of 10 μm or more among pores open on surfaces of the partition walls is from 20 to 50%, a pore density of pores having an equivalent circle diameter of 10 μm or more among pores open on surfaces of the partition walls is from 200 to 1,000 pores/mm, a median opening diameter of pores having an equivalent circle diameter of 10 μm or more among pores open on surfaces of the partition walls is from 40 to 60 μm, where the median opening diameter is a median value of the equivalent circle diameters, a wet area of the partition walls is 16,500 μmor more.'}2. The honeycomb structure according to claim 1 , wherein a wet area of the partition walls is 16 claim 1 ,500 μmor more and 21 claim 1 ,500 μmor less.3. The honeycomb structure according to claim 1 , wherein a thickness of the partition walls is from 89 to 203 μm.4. The honeycomb structure ...

Low-Temperature Oxidation Catalyst With Particularly Marked Hydrophobic Properties ForThe Oxidation Of Organic Pollutants

The present invention relates to a catalyst comprising a macroporous noble metal-containing zeolite material and a porous SiO-containing binder, wherein the catalyst has a proportion of micropores of more than 70%, based on the total pore volume of the catalyst. The invention is additionally directed to a process for preparing the catalyst and to the use of the catalyst as an oxidation catalyst. 112-. (canceled)13. A method of purifying exhaust , the method comprising:providing an exhaust gas containing an organic pollutant; a microporous noble metal-containing zeolite material, the zeolite material having less than 2 mol. % aluminium, the zeolite material being selected from zeolites of the types AFI, AEL, BEA, CHA, EUO, FAU, FER, KFI, LTL, MAZ, MOR, MEL, MTW, OFF, TON and MFI, the noble metal being selected from the group consisting of rhodium, iridium, palladium, platinum, ruthenium, osmium, gold and silver and combinations thereof; and', {'sub': '2', 'a porous SiO-containing binder having less than 0.04 wt % aluminium,'}, 'wherein the catalyst has a proportion of micropores having a diameter of less than 1 nm of more than 70% relative to the total pore volume of the catalyst., 'oxidizing the exhaust gas with a catalyst under conditions sufficient to oxidize the organic pollutant, the catalyst comprising'}14. The method according to claim 13 , wherein the exhaust gas is an exhaust gas from a combustion process.15. The method according to claim 13 , wherein the exhaust gas is an exhaust gas from a power plant.16. The method according to claim 13 , wherein the exhaust gas is an exhaust gas from an industrial process.17. The method according to claim 13 , wherein the oxidation is performed at a temperature below 300° C.18. The method according to claim 13 , wherein the organic pollutant is a solvent-type organic pollutant.19. The method according to claim 13 , wherein the organic pollutant is a paraffin claim 13 , an olefin claim 13 , an aldehyde or an aromatic.20. ...

EXHAUST GAS PURIFYING DEVICE

An exhaust gas purifying device includes a first SCR catalyst converter, an oxidation catalyst converter, a filter section, and a second SCR catalyst converter arranged in series to a flow direction of an exhaust gas. The first SCR catalyst converter includes a pillar-shaped honeycomb structure a cell density of which is from 31 to 78 cells/cm, a porosity of the partition walls of which is from 50 to 65%, and in which a first SCR catalyst is loaded onto the surfaces of the partition walls and inner portions of pores formed in the partition walls, and an amount of the first SCR catalyst to be loaded onto the surfaces of the partition walls and the inner portions of the pores is from 200 to 500 g/L and an amount of the first SCR catalyst to be loaded onto the inner portions of the pores is from 5 to 80 g/L. 1. An exhaust gas purifying device comprising a first SCR catalyst converter , an oxidation catalyst converter , a filter section , and a second SCR catalyst converter ,wherein the first SCR catalyst converter, the oxidation catalyst converter, the filter section and the second SCR catalyst converter are arranged in series to a flow direction of an exhaust gas of an exhaust system in a state of being stored in a case connected to the exhaust system of an internal combustion engine,the oxidation catalyst converter is disposed on a downstream side of the first SCR catalyst converter,the filter section is disposed on a downstream side of the oxidation catalyst converter,the second SCR catalyst converter is disposed on a downstream side of the filter section,the first SCR catalyst converter comprises a pillar-shaped honeycomb structure having porous partition walls arranged to surround a plurality of cells extending from a first end face to a second end face to form through channels for the exhaust gas,{'sup': '2', 'a cell density of the honeycomb structure is from 31 to 78 cells/cm,'}a porosity of the partition walls of the honeycomb structure is from 50 to 65%,in the ...

Carbon-Coated Transition Metal Nanocomposite Material, its Preparation and Application Thereof

A carbon-coated transition metal nanocomposite material includes carbon-coated transition metal particles having a core-shell structure. The shell layer of the core-shell structure is a graphitized carbon layer doped with oxygen and/or nitrogen, and the core of the core-shell structure is a transition metal nanoparticle. The nanocomposite material has a structure rich in mesopores, is an adsorption/catalyst material with excellent performance, can be used for catalyzing various hydrogenation reduction reactions, or used as a catalytic-oxidation catalyst useful for the treatment of volatile organic compounds in industrial exhaust gases. 1. A nanocomposite material comprising carbon-coated transition metal particles , the carbon-coated transition metal particles having a core-shell structure , the shell layer being a graphitized carbon layer doped with oxygen and/or nitrogen , and the core being a transition metal nanoparticle , wherein the nanocomposite material is a porous material having at least one distribution peak of mesopores , preferably a porous material having two or more distribution peaks of mesopores.2. The nanocomposite material according to claim 1 , wherein the nanocomposite material has a loss on acid leaching of 40% or less claim 1 , preferably 30% or less claim 1 , more preferably 10% or less.3. (canceled)4. (canceled)5. The nanocomposite material according to claim 1 , further comprising an amorphous carbon matrix claim 1 , the carbon-coated transition metal particles being dispersed in the amorphous carbon matrix; preferably claim 1 , the nanocomposite material is consisted of the amorphous carbon matrix and carbon-coated transition metal particles dispersed therein.6. The nanocomposite material according to claim 1 , wherein the nanocomposite material has a proportion of mesopore volume to total pore volume of greater than about 50% claim 1 , preferably greater than about 80% claim 1 , more preferably greater than about 90% claim 1 , ...

Exhaust gas purification filter

[Summary] [Problem] The problem addressed by the present invention lies in providing an exhaust gas purification filter which can efficiently treat particulate matter in exhaust gas. [Solution] The present invention provides an exhaust gas purification filter including a substrate comprising a plurality of porous partitions, wherein the partitions form an exhaust gas flow path, a porous catalytic layer is provided on the partitions and the catalytic layer having a thickness of 10 μm or greater is provided over at least 20% of the total length of the partitions in the lengthwise direction thereof, and the catalytic layer having a thickness of 10 μm or greater is not present on the partitions 15 mm from an outflow side.

POWDERED TITANIUM OXIDE, METHOD FOR THE PRODUCTION THEREOF, AND USE THEREOF

A powdered catalyst material on a titanium oxide basis. The powdered catalyst material includes a combined content of at least 90 wt.-% of a hydrated titanium oxide having the general formula TiO(OH), with 0300 m/g and an isoelectric point of from 4.0 to 7.0. 117-. (canceled)18: A powdered catalyst material on a titanium oxide basis , the powdered catalyst material comprising: [{'sub': (2-x)', '2x', '2, 'a hydrated titanium oxide having the general formula TiO(OH), with 0300 m/g; and'}an isoelectric point of from 4.0 to 7.0,wherein,{'sub': 2', '2', '2', '2, 'a weight ratio of TiO/SiO, determined for TiOand SiOrespectively, is at least 3 and less than 30, and'}the wt.-% is based on a total weight of the catalyst material after the catalyst material has been dried at 105° C. for at least 2 hours.19: The powdered catalyst material as recited in claim 18 , further comprising:{'sup': '2', 'a photocatalytic chloroform decomposition rate of more than 0.3 mmol/(h*m).'}20: The powdered catalyst material as recited in claim 18 , further comprising:{'sub': '2', 'sup': '3', 'a total pore volume (Ndesorption) of at least 0.3 cm/g.'}21: The powdered catalyst material as recited in claim 18 , further comprising:{'sup': '2', 'a specific surface area of at least 80 m/g after a thermal treatment for 1 hour at 500° C. under a normal atmosphere.'}22: The ...

HONEYCOMB STRUCTURE

A honeycomb structure includes a porous partition wall defining a plurality of cells, wherein the plurality of cells include a first cell and a second cell, on the partition wall disposed to surround the at least one first cell, a protrusion is each provided with, the first protrusion and the second protrusion are each disposed to at least partially overlap with each other on extended lines in extending directions of the respective protrusions, and an inter-protrusion length (X) of a distal end of the first protrusion and a distal end of the second protrusion is equal to or more than 10% and equal to or less than 70% with respect to a mutual distance (W) from the one part to the other part on the partition walls facing each other. 1. A honeycomb structure , comprising:a porous partition wall defining a plurality of cells which become a fluid channel extending from a first end face to a second end face,wherein the plurality of cells include a first cell in which an end portion on the first end face side is open and an end portion on the second end face side is plugged and a second cell in which an end portion on the first end face side is plugged and an end portion on the second end face side is open,the honeycomb structure is configured to pass a fluid introduced from the first end face side through the partition wall to emit the fluid into the second cell as a filtration fluid and emit the filtration fluid from the second end face side,in a cross section orthogonal to an extending direction of the cell, the first cell is disposed around the second cell,an open frontal area of the first cell on the first end face is larger than that of the second cell on the second end face,on the partition wall disposed to surround the at least one first cell, opposed parts having the first cell sandwiched therebetween are each provided with a protrusion which protrudes into the first cell,among the two protrusions disposed at the opposed parts on the partition wall, the protrusion ...

HONEYCOMB STRUCTURE

A honeycomb structure includes a porous partition wall defining a plurality of cells, wherein the plurality of cells include a first cell and a second cell, an open frontal area of the first cell on the first end face is larger than that of the second cell on the second end face, on the partition wall disposed to surround the at least one first cell, a protrusion which protrudes into the first cell is provided with, the first protrusion and the second protrusion are each disposed not to overlap with each other on extended lines in extending directions of the respective protrusions, and a protrusion height (H) of the first protrusion and a protrusion height (H) of the second protrusion are each equal to or more than 15% and equal to or less than 90% with respect to a mutual distance W of the partition walls facing each other. 1. A honeycomb structure , comprising:a porous partition wall defining a plurality of cells which becomes a fluid channel extending from a first end face to a second end face,wherein the plurality of cells include a first cell in which an end portion on the first end face side is open and an end portion on the second end face side is plugged and a second cell in which an end portion on the first end face side is plugged and an end portion on the second end face side is open,the honeycomb structure is configured to pass a fluid introduced from the first end face side through the partition wall to emit the fluid into the second cell as a filtration fluid and emit the filtration fluid from the second end face side,in a cross section orthogonal to an extending direction of the cell, the first cell is disposed around the second cell,an open frontal area of the first cell on the first end face is larger than that of the second cell on the second end face,on the partition wall disposed to surround the at least one first cell, each of the at least one pair of partition walls having the first cell sandwiched therebetween is provided with a protrusion ...

EXHAUST TREATMENT SYSTEM FOR A LEAN BURN ENGINE

The present invention relates generally to the field of exhaust treatment systems for purifying exhaust gas discharged from a lean burn engine. The exhaust treatment system comprises a Diesel Oxidation Catalyst (DOC), a Catalyzed Soot Filter (CSF), a reductant injector, an AEI zeolite based Selective Catalyzed Reduction (SCR) catalyst and an Ammonia Oxidation Catalyst (AMOX) downstream to the AEI zeolite based SCR catalyst. 1. An exhaust treatment system for a lean burn engine , the exhaust treatment system comprising a Diesel Oxidation Catalyst (DOC) , a Catalyzed Soot Filter (CSF) , a first reductant injector , an AEI zeolite based Selective Catalyzed Reduction (SCR) catalyst , and a first Ammonia Oxidation Catalyst (AMOx) downstream to the AEI zeolite based SCR catalyst;wherein the AEI zeolite has a silica to alumina molar ratio of 10-19.2. The exhaust treatment system according to claim 1 , further comprising a second SCR placed between the AEI zeolite based SCR catalyst and the first AMOx catalyst; and an optionally a second reductant injector placed between the AEI zeolite based SCR catalyst and the second SCR catalyst.3. The exhaust treatment system according to claim 1 , further comprising a second SCR catalyst and an optionally second AMOx catalyst claim 1 , wherein the AEI zeolite based SCR catalyst and the second AMOx catalyst are placed upstream of the DOC and CSF; and the second SCR catalyst and the first AMOx catalyst are placed downstream of the DOC catalyst.4. The exhaust treatment system according to claim 3 , further comprising a second reductant injector in front of the second SCR catalyst claim 3 , wherein the first reductant injector is placed in front of the AEI zeolite based SCR catalyst.5. The exhaust treatment system according to claim 2 , wherein the second SCR catalyst comprises a zeolite material chosen from AEI zeolite claim 2 , CHA zeolite claim 2 , and BEA zeolite.6. The exhaust treatment system according to claim 2 , wherein the AEI ...

Exhaust gas treatment catalyst

Described is a catalyst composition suitable for use as a selective catalytic reduction catalyst, including small-pore molecular sieve particles having a pore structure and a maximum ring size of eight tetrahedral atoms and impregnated with a promoter metal, and metal oxide particles dispersed within the small-pore molecular sieve particles and external to the pore structure of the small-pore molecular sieve particles, wherein the metal oxide particles include one or more oxides of a transition metal or lanthanide of Group 3 or Group 4 of the Periodic Table. A method for preparing the catalyst, a method for selectively reducing nitrogen oxides, and an exhaust gas treatment system are also described.

Process for the production of a zeolitic material via solvent-free interzeolitic conversion

A process for preparing a zeolitic material containing YO2 and X2O3, where Y and X represent a tetravalent element and a trivalent element, respectively, is described. The process includes (1) a step of preparing a mixture containing one or more structure directing agents, seed crystals, and a first zeolitic material containing YO2 and X2O3 and having FAU-, GIS-, MOR-, and/or LTA-type framework structures; and (2) a step of heating the mixture for obtaining a second zeolitic material containing YO2 and X2O3 and having a different framework structure than the first zeolitic material. The mixture prepared in (1) and heated in (2) contains 1000 wt % or less of H2O based on 100 wt % of YO2 in the framework structure of the first zeolitic material. A zeolitic material obtainable and/or obtained by the process and its use are also described.

CATALYTIC ARTICLE COMPRISING A COPRECIPITATE OF VANADIA, TUNGSTA, AND TITANIA

The present disclosure provides catalytic materials formed of co-precipitates of vanadium, tungsten, and titanium, catalytic articles formed using such co-precipitates, and methods of making such precipitates. The co-precipitates may be used in the form of calcined particles, and catalytic articles incorporating coatings formed of the co-precipitate can exhibit improved adhesion and performance. 1. A catalytic article comprising a substrate that includes a catalytic material comprising calcined particles of a co-precipitate of vanadia , tungsta , and titania.2. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate are predominately crystalline.3. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate exhibit conchoidal fractures.4. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate comprise agglomerates of individual nanoparticles claim 1 , the agglomerates having a particle size distribution of d10<20 μm claim 1 , d50<100 μm claim 1 , d90<210 μm claim 1 , and the individual nanoparticles having an average size of about 5 nm to about 20 nm.5. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate comprise a coarse fraction having an average size of greater than 150 μm and a fine fraction having an average size of less than 150 μm.6. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate have a BET surface area of about 100 m/g to about 180 m/g.7. The catalytic article of claim 1 , wherein the calcined particles of the co-precipitate comprise about 0.1% to about 15% by weight vanadia claim 1 , about 1% to about 20% by weight tungsta claim 1 , and the balance titania claim 1 , said weights based on the total weight of the calcined particles of the co-precipitate.8. The catalytic article of claim 1 , wherein about 50% or greater by weight of the titania in the calcined particles of the co-precipitate ...

HONEYCOMB FILTER

A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and a porous plugging portion provided either at an end on the inflow end face or the outflow end face of the cells, wherein the plugging portion is composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, porosity of a central plugging portion in the central region is lower than that of a circumferential plugging portion in the circumferential region, and the porosity of the central plugging portions ranges from 60% to 68%, and that of the circumferential plugging portions ranges from 70% to 85%. 1. A honeycomb filter comprising:a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face; anda porous plugging portion provided either at an end on the inflow end face side of the cells or at an end on the outflow end face side of the cells,wherein the plugging portion is composed of a porous material,{'b': 2', '1', '2', '1, 'the honeycomb structure has a central region that includes a center of gravity in a section orthogonal to a direction in which the cells extend, and a circumferential region on a farther circumferential side from the central region, and has S/S, which denotes a ratio of an area S of the circumferential region with respect to an area S of the central region, ranging from 0.1 to 0.5,'}{'b': 1', '2, 'porosity P of a central plugging portion, which is the plugging portion existing in the central region is lower than porosity P of a circumferential plugging portion, which is the plugging portion existing in the ...

Honeycomb filter

A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face or the outflow end face of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, a plugging length L1 in the cell extending direction of a central plugging portion in the central region is larger than a plugging length L2 of a circumferential plugging portion in the circumferential region, L1 ranges from 7 to 9 mm, and L2 from 3 to 6 mm.

CATALYZED SCR FILTER AND EMISSION TREATMENT SYSTEM

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. 127-. (canceled)28. A catalyst article comprising a wall flow monolith and a catalytic material contained within the wall flow monolith , wherein the wall flow monolith has a wall porosity of at least 50% and comprises a plurality of longitudinally extending passages formed by longitudinally extending porous walls bounding and defining said passages , wherein the passages comprise inlet passages having an open inlet end and a closed outlet end , and outlet passages having a closed inlet end and an open outlet end , and wherein the catalytic material comprises a zeolite and a base metal selected from copper and iron present in an amount of from about 0.1 to 30 percent by weight of the total weight of base metal plus zeolite , the zeolite having pores connected in three dimensions and a silica to alumina ratio of at least about 10 , the wall flow monolith having integrated NOx and particulate removal efficiency when exposed to diesel engine exhaust and ammonia or an ammonia precursor.29. The catalyst article of claim 28 , wherein the base metal selected from copper and iron is present in an amount of from about 1 to 5 percent by weight of the total weight of base metal plus zeolite.30. The catalyst article of claim 28 , wherein the wall flow monolith has from about 100 to 400 cells per square inch.31. The catalyst article of claim 28 , wherein the wall flow monolith has a wail thickness between 0.002 and 0.015 inches.32. The catalyst article of claim 28 , wherein the catalytic: material permeates the porous walls at a concentration of 1.6 to 2.4 g/in claim 28 , and wherein the porous walls have a porosity of from 55 to 75% and an average pore ...

Palladium diesel oxidation catalyst

An oxidation catalyst composite for abatement of exhaust gas emissions from a lean burn engine is provided, the catalyst composite including a carrier substrate having a length, an inlet end and an outlet end, and an oxidation catalyst material coated on the carrier substrate. The oxidation catalyst material can include a first layer and a second layer. The first layer can include a first oxygen storage component that includes ceria and is impregnated with a palladium (Pd) component and a second component including one or more of magnesium (Mg), rhodium (Rh), and platinum (Pt). The second layer can include a refractory metal oxide component impregnated with platinum (Pt) and palladium (Pd), wherein the ratio of Pt to Pd is in the range of about 0:10 to about 10:0.

MOLECULAR SIEVE CATALYST COMPOSITIONS, CATALYST COMPOSITES, SYSTEMS, AND METHODS

Described is a selective catalytic reduction material comprising a spherical particle including an agglomeration of crystals of a molecular sieve. The catalyst is a crystalline material that is effective to catalyze the selective catalytic reduction of nitrogen oxides in the presence of a reductant at temperatures between 200° C. and 600° C. A method for selectively reducing nitrogen oxides and an exhaust gas treatment system are also described. 129.-. (canceled)30. A system for treating exhaust gas from a lean burn engine containing NO , the system comprising:a selective catalytic reduction (SCR) material comprising a spherical particle having a median particle size of about 0.5 to about 5 microns, comprising an agglomeration of crystals of a metal-promoted molecular sieve,wherein the crystals have approximately the same crystal size, wherein the same crystal size is selected from the range of about 1 to about 250 nm, andwherein the metal-promoted molecular sieve has a structure type selected from the group consisting of AEI, AFT, AFX, CHA, EAB, EMT, ERI, FAU, GME, JSR, KFI, LEV, LTL, LTN, MOZ, MSO, MWW, OFF, SAS, SAT, SAV, SBS, SBT, SFW, SSF, SZR, TSC, WEN, and combinations thereof; andat least one other exhaust gas treatment component.31. The system of claim 30 , wherein the least one other exhaust gas treatment component is selected from a soot filter claim 30 , a diesel oxidation catalyst claim 30 , an ammonia oxidation catalyst claim 30 , and combinations thereof.32. The system of claim 31 , wherein the system comprises a soot filter claim 31 , and wherein the soot filter is a wall-flow filter substrate upon which the SCR material is disposed.33. The system of claim 31 , wherein the system comprises a diesel oxidation catalyst located upstream of the SCR material.34. The system of claim 31 , wherein the system comprises an ammonia oxidation catalyst located downstream of the SCR material.35. The system of claim 34 , wherein the ammonia oxidation catalyst ...

NANO-CATALYST FILTER AND PRODUCTION METHOD FOR SAME

Provided is a method of manufacturing a nano-catalyst filter, which includes depositing through electrodeposition a catalyst precursor inside a porous filter to which an electrode layer is attached. Using this method, a nano-catalyst can be uniformly deposited inside a porous ceramic filter, and high catalyst efficiency can be obtained only using a small amount of the nano-catalyst. 1. A method of manufacturing a nano-catalyst filter , comprising:providing a porous filter to which an electrode layer is attached;dipping said porous filter to which said electrode layer is attached into a plating bath filled with an electrolyte solution containing a nanowire catalyst precursor and nanoparticle catalyst precursor, and removing air in said porous filter by decompressing the plating bath; andperforming electrodeposition;wherein the nanowire catalyst and the nanoparticle catalyst are formed inside the porous filter,and the nanoparticle catalyst is formed on the surface of the nanowire catalyst.2. The method of claim 1 , wherein the porous filter is formed of a material selected from the group consisting of ceramic claim 1 , alumina claim 1 , silica claim 1 , mullite claim 1 , zeolite claim 1 , zirconia claim 1 , titanium oxide claim 1 , silicon carbide claim 1 , and cordierite.3. The method of claim 1 , wherein the porous filter is formed as a disc type or a honeycomb type porous filter.4. The method of claim 1 , wherein the diameter of the nanowire catalyst is 5 to 50 nm claim 1 , the length of the nanowire catalyst is 20 to 200 nm claim 1 ,and the average particle diameter of the nanoparticle catalyst is 1 to 10 nm.5. The method of claim 1 , wherein the nanowire catalyst and nanoparticle catalyst are each selected from the group consisting of a metal oxide claim 1 , a transition metal claim 1 , a noble metal claim 1 , and a rare earth metal.6. The method of claim 1 , wherein the nanowire catalyst is at least one selected from the group consisting of manganese oxide (MnO) ...

A reactor for reducing nitrogen oxides

A reactor for reducing the concentration of NO x in a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NOx; one or more catalyst beds comprising a ceramic or metallic foam with a NOx reduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at the top and bottom so that the flow path through the catalyst bed passes through the sides of the catalyst bed in a lateral flow is described.

A CATALYST BED AND METHOD FOR REDUCING NITROGEN OXIDES

A catalyst bed comprising a ceramic or metallic foam comprising one or more NOreduction catalysts is described. A method for reducing the concentration of NOin a dust containing gas stream comprising: a) passing a first gas stream containing NOinto a contacting zone; b) contacting the first gas stream with a ceramic or metallic foam catalyst bed having one or more flow paths through the catalyst bed wherein the ceramic or metallic foam comprises a NOreduction catalyst to produce a second gas stream with a reduced NOconcentration; and c) passing the second gas stream out of the contacting zone wherein the first gas stream has a dust concentration of at least 5 mg/Nmand the pressure drop of the foam catalyst bed increases by 300% or less relative to the initial pressure drop of the foam catalyst bed due to dust accumulation, measured under the same conditions is also described. 1. A catalyst bed comprising a ceramic or metallic foam comprising one or more NOreduction catalysts.2. The catalyst bed of wherein the ceramic or metallic foam has a void space of at least 60%.3. (canceled)4. (canceled)5. The catalyst bed of wherein the ceramic or metallic foam has an interconnected internal tortuous pore structure providing flow paths through the catalyst bed that have a tortuosity of treater than 1.0.6. (canceled)7. The catalyst bed of wherein the catalyst bed has from about 5 to about 50 pores per inch.8. (canceled)9. The catalyst bed of wherein the ceramic foam comprises cordierite claim 1 , titanium oxide or alumina.10. The catalyst bed of wherein the metallic foam comprises nickel claim 1 , iron or alloys thereof.11. The catalyst bed of wherein the NOreduction catalyst comprises vanadium claim 1 , molybdenum claim 1 , tungsten or mixtures thereof.12. The catalyst bed of wherein the catalyst bed further comprises a binder material.14. The method of wherein the first gas stream has a dust concentration of at least 10 mg/Nm.15. (canceled)16. (canceled)17. (canceled)18. The ...

A PROCESS FOR PREPARING A ZEOLITIC MATERIAL HAVING A FRAMEWORK STRUCTURE TYPE RTH

A process for preparing a zeolitic material having a framework structure type RTH and having a framework structure comprising a tetravalent element Y, a trivalent element X and oxygen, said process comprising (i) preparing a synthesis mixture comprising a zeolitic material having a framework structure type FAU and having a framework structure comprising the tetravalent element Y, the trivalent element X and oxygen, water, a source of a base, and an RTH framework structure type directing agent comprising a N-methyl-2, 6-dimethylpyridinium cation containing compound; (ii) subjecting the mixture obtained in (i) to hydrothermal crystallization conditions, obtaining the zeolitic material having a framework structure type RTH 1. A process for preparing a zeolitic material having a framework structure type RTH and having a framework structure comprising a tetravalent element Y , a trivalent element X , and oxygen , the process comprising:subjecting to hydrothermal crystallization conditions, a synthesis mixture comprising a zeolitic material having a FAU framework structure and having a framework structure comprising the tetravalent element Y, the trivalent element X, and oxygen, water, a source of a base, and an RTH framework structure directing agent comprising a N-methyl-2,6-dimethylpyridinium cation-comprising compound, to obtain the zeolitic material having an RTH framework structure,wherein Y is Si, Sn, Ti, Zr, and/or Ge, andwherein X is Al, B, In, and/or Ga.2. The process of claim 1 , wherein the N-methyl-2 claim 1 ,6-dimethylpyridinium cation comprising compound is a salt.3. The process of claim 1 , wherein Y is Si.4. The process of claim 1 , wherein the zeolitic material having a framework structure type FAU is faujasite claim 1 , zeolite Y claim 1 , zeolite X claim 1 , LSZ-210 claim 1 , US Y claim 1 , or a mixture of two or more thereof.5. The process of claim 1 , wherein claim 1 , in the synthesis mixture claim 1 , a molar ratio of HO relative to Y claim 1 , ...

FOUR-WAY CONVERSION CATALYST HAVING IMPROVED FILTER PROPERTIES

A four-way conversion catalyst for treating a gasoline engine exhaust gas has a porous wall flow filter substrate with an inlet end, outlet end, substrate axial length extending between the inlet and outlet end, and passages defined by porous internal walls of the substrate, the passages having inlet passages with an open inlet and closed outlet, and outlet passages having a closed inlet and open outlet. The internal wall pores have a three-way conversion catalytic in-wall coating with an oxygen storage compound and a platinum group metal supported on a refractory metal oxide. On at least a portion of the internal wall surface defining the interface between the internal walls and the passages, the catalyst has a porous on-wall coating from the internal wall surface to the passage. The coating has porous oxidic compound and platinum group metal content of 0 to 0.001 wt. %, of the total coating weight. 1. A four-way conversion catalyst suitable for treating an exhaust gas stream of a gasoline engine , the catalyst comprising:a porous wall flow filter substrate comprising an inlet end, an outlet end, a substrate axial length extending between the inlet end and the outlet end, and a plurality of passages defined by porous internal walls of the porous wall flow filter substrate,wherein the plurality of passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end,wherein pores of the porous internal walls comprise a three-way conversion catalytic in-wall coating comprising an oxygen storage compound and a platinum group metal supported on a refractory metal oxide,wherein, on at least a portion of a surface of the porous internal walls, the surface defining and interface between the porous internal walls and the passages, the catalyst comprises a porous on-wall coating extending from the surface of the internal walls to the passage, andwherein the on-wall coating comprises a porous ...

PLUGGED HONEYCOMB SEGMENT, AND PLUGGED HONEYCOMB STRUCTURE

A plugged honeycomb segment includes a honeycomb segment having a quadrangular prism shape which includes porous partition walls arranged to surround a plurality of cells and an outermost circumferential wall, and a plugging portion, wherein a porosity of the partition walls is 30 to 70%, in a cross section orthogonal to the cell extending direction, an inflow cell surrounded by the partition walls is a hexagon, and an outflow cell is a square, one outflow cell is surrounded by four inflow cells, the cell located at the outermost circumference includes a complete cell and an incomplete cell, and a thickness of the outermost circumferential wall in contact with the incomplete cell (T), a thickness of the outermost circumferential wall in contact with the complete cell (T), and a thickness of the partition walls (WT), satisfy 0.200 mm Подробнее