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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 38. Отображено 38.
18-12-1990 дата публикации

Multi-function additive for lubricating oils

Номер: US0004978464A1
Автор: Coyle; Catherine L., Halbert; Thomas R., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

A lubricating oil composition is provided which comprises a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula Mo4 S4 L6 in which L is a ligand selected from dithiocarbamates, dithiophosphates, dithiophosphinates, thioxanthates, and mixtures thereof and in which the ligands, L, have organo groups having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the organo groups of the ligands, L, will be the same, although they may be different and they preferably are selected from alkyl, aryl, substituted aryl and ether groups. For example, when L is a dialkyldithiocarbamate or a dialkyldithiophosphate, the alkyl groups will have from about 1 to 30 carbon atoms.

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Номер записи: 1
25-05-1999 дата публикации

Method of synthesizing Mo3 Sx containing compounds

Номер: US0005906968A1
Автор: McConnachie; Jonathan M., Stiefel; Edward I., Bell; Ian Alexander Weston, Arunasalam; Velautha-Cumaran
Принадлежит: Exxon Research & Engineering Company

A method of making an oil-soluble or oil-dispersible trinuclear molybdenum-sulfur compound, comprising: reacting two to less than three equivalents of a tetrahydrocarbyl thiuram disulfide and one equivalent of a compound containing the ?Mo3 S13 !2- ion to produce a trinuclear molybdenum compound of the formula Mo3 Sx (L)4 wherein x is from 4 to 10 and L is dihydrocarbyl-dithiocarbamate.

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Номер записи: 2
05-08-1986 дата публикации

Catalytic process for hydroconversion of solid carbonaceous materials

Номер: US0004604183A1
Автор: Edelson; Edward H., Stiefel; Edward I., Chianelli; Russell R., Coyle; Catherine L.
Принадлежит: Exxon Research and Engineering Co.

An improved hydroconversion process for carbonaceous materials wherein an ammonium or hydrocarbyl substituted ammonium salt of a metal-sulfur analog of cubane having an anion with a core structure of M4 S4 is used as a catalyst precursor. In the general formula, M may be the same or a different metal having hydrogenation catalytic activity when used as a sulfide and capable of occupying one or more vertices in a cubane structure. The metal may also have the capability of bridging one or more such structures. The improved process is effective for both normally solid and normally liquid carbonaceous materials and for carbonaceous materials which are either solid or liquid at the conversion conditions. The hydroconversion will be accomplished at a temperature within the range from about 500° to about 900° F., at a total pressure within the range from about 500 to about 7000 psig and at a hydrogen partial pressure within the range from about 400 to about 5000 psig.

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Номер записи: 3
13-12-1994 дата публикации

Fullerene compositions and preparation

Номер: US0005372798A1
Автор: McConnachie; Jonathan M., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

The invention relates to a composition that is the reaction of a fullerene containing at least one corrannulene ring structure and Y2 X2, wherein Y is Se or S, and X is Cl or Br. Generally, these compounds may be represented by the formula Cfn X6 Y2 or more particularly Cfn X5 (YYX). In the formula Cfn more specifically, is a fullerene having at least one corrannulene ring structure. The compositions may be made by reacting fullerenes with Se2 X2 or S2 X2 wherein X is Cl or Br, preferably in liquid form and preferably heated for a time sufficient to produce the novel compositions. The compositions may be isolated in crystalline form by precipitation with a solvent such as hexane. In crystalline form the compositions may be represented by the generic formula Cfn X8 Y4, or more particularly, Cfn X5 (YYX).mY.sub.2 X2 because in crystalline form the compositions are typically associated with .mY.sub.2 X2 molecules wherein m is an integer at least equal to 1. The compositions have utility as ...

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Номер записи: 4
30-10-1990 дата публикации

Multifunctional molybdenum and sulfur containing lube additives

Номер: US0004966719A1
Автор: Coyle; Catherine L., Greaney; Mark A., Stiefel; Edward I., Beltzer; Morton
Принадлежит: Exxon Research & Engineering Company

In accordance with this invention, there is provided a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula MoL4 wherein L is a ligand selected from thioxanthates and mixtures thereof and, in particular, thioxanthates having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the thioxanthate ligand, L, will have from about 2 to about 30 carbon atoms.

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Номер записи: 5
15-10-1985 дата публикации

Compounds containing the [Co(MoS4)2 ]3- trianion and their preparation

Номер: US0004547321A1
Автор: Stiefel; Edward I., Pan; Wie-Hin, McKenna; Stephen
Принадлежит: Exxon Research and Engineering Co.

Compositions of the formula [(Catn)]3/n [Co(MoS4)2 ] wherein Cat is a mono, di or trivalent cation and n is 1, 2 or 3, respectively, have been prepared in non-aqueous media. The [Co(MoS4)2 ]3- anion has the general structure см. иллюстрацию в PDF-документе Cat is preferably an alkyl substituted quaternary ammonium compound.

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Номер записи: 6
29-04-1986 дата публикации

Sulfido(disulfido)bis(N,N-substituted dithiocarbamato)W(VI) complexes

Номер: US0004585882A1
Автор: Stiefel; Edward I., Pan; Wie-Hin, Halbert; Thomas R.
Принадлежит: Exxon Research and Engineering Co.

This invention relates to sulfido(disulfido)bis(N,N-substituted dithiocarbamato)W(VI) complexes, their preparation and use. More particularly, this invention relates to compounds of the formula WS(S2) (S2 CNR2)2 which are mononuclear, seven-coordinate, neutral W(VI) complexes containing only seven sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as catalysts or catalyst precursors for removing sulfur from sulfur containing hydrocarbons.

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Номер записи: 7
24-03-1992 дата публикации

Method for making Mo4 S4 L6 (C-2387)

Номер: US0005099046A1
Автор: Coyle; Catherine L., Guzi; Peter J., Halbert; Thomas R., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

The present invention provides an improved method for preparing compounds of the formula Mo4 S4 L6 comprising: contacting a compound having the formula Mo2 S4 L2, wherein L is a 1,1-dithioacid ligand, with a reducing agent having a reduction potential sufficient to reduce Mo(V) to lower oxidation states, especially to Mo(III) and Mo(IV), at a temperature and for a time sufficient to form the Mo4 S4 L6 compound. Preferably, the Mo2 S4 L2 compound is dissolved in an organic solvent along with the reducing agent and the solution is heated at temperatures above 25° C., up to the boiling point of the solvent and, more preferably, at temperatures in the range of from about 50° C. to about 250° C.

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Номер записи: 8
04-09-1990 дата публикации

Dithioacid rhenium sulfide dimer compositions

Номер: US0004954645A1
Автор: Halbert; Thomas R., Wei; Liwen, Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

Briefly stated, the present invention encompasses a new class of rhenium 1,1-dithioacid complexes and their method of preparation. The complexes have the general formula [L2 Re(μ-S)]2 wherein L is a dithioacid or similar ligand, and μ denotes the fact that the sulfur atoms in the core of the complex bridge the two rhenium atoms in the complex. Thus, the core structure for such typical compounds is generally of the form: см. иллюстрацию в PDF-документе where the dangling valences are associated with the sulfur atoms of a 1,1-dithioacid, L.

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Номер записи: 9
05-05-1992 дата публикации

Method for making Mo4 S4 L6 (C-2386)

Номер: US0005110963A1
Автор: Coyle; Catherine L., Farina; Scott A., Stiefel; Edward I., Greaney; Mark A.
Принадлежит: Exxon Research & Engineering Company

The present invention is predicated on the discovery that Mo(III) containing compounds will react with salts of a 1,1-dithioacid to form Mo4 S4 L6. Accordingly, there is provided a method for preparing compounds of the formula Mo4 S4 L6 wherein L is a 1,1-dithioacid ligand comprising: contacting a Mo(III) containing compound with the salt of a 1,1-dithioacid at temperatures and for a time sufficient to form the Mo4 S4 L6 compound. Preferably, the Mo(III) containing compound is dissolved in an organic solvent and the solution is heated at temperatures above about 25° C. up to the boiling point of the solvent and, preferably, at temperatures in the range of about 25° C. to about 250° C.

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Номер записи: 10
26-02-1991 дата публикации

Molybdenum sulfur antiwear and antioxidant lube additives

Номер: US0004995996A1
Автор: Coyle; Catherine L., Greaney; Mark A., Stiefel; Edward I., Francis; James N., Beltzer; Morton
Принадлежит: Exxon Research and Engineering Company

In accordance with this invention, there is provided a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula Mo2 L4 wherein L is a ligand selected from xanthates and mixtures thereof and, in particular, xanthates having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the xanthate ligand, L, will have form about 2 to 30 carbon atoms.

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Номер записи: 11
23-05-1989 дата публикации

Tetranuclear sulfido-bridged complex of Cr(III) having a strongly magnetic ground state

Номер: US0004832877A1
Автор: Bino; Avi, Johnston; David C., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

Broadly stated, the present invention encompasses tetranuclear sulfide-bridged complexes of Cr(III) having bridging organo-carboxylate ligands. Indeed, in one embodiment, the present invention is directed toward a novel composition of matter having a complex cation of the general formula Cr4 S(RCO2)8 (L)42+, wherein R represents alkyl groups having from 1 to 12 carbon atoms, L represents a ligand or ligands containing a donor atom selected from oxygen, nitrogen, carbon, and sulfur. In the complex of the present invention, the four Cr(III) atoms are bound to a central tetrahedral sulfur atom. The chromium atoms also are octahedrally coordinated with bridging carboxylates and the ligand molecule. Also, the bridging carboxylates, RCO2 of the above formula, are the same or different carboxylates.

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Номер записи: 12
05-03-1991 дата публикации

Synthesis of tetrathioperrhenate salts

Номер: US0004997962A1
Автор: Wei; Liwen, Halbert; Thomas R., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

According to the present invention, an improved method for preparing tetrathioperrhenate salts is provided. Basically, a water soluble, oxygen-containing rhenium compound such as rhenium oxide or a salt containing an oxyanion of rhenium, such as ReO4--, is contacted with an aqueous ammonium sulfide or polysulfide solution in the presence of a cation which is capable of forming an aqueous insoluble salt with tetrathioperrhenate.

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Номер записи: 13
05-04-1994 дата публикации

Method for making molybdenum and sulfur containing compounds

Номер: US0005300274A1
Автор: Wei; Liwen, Coyle; Catherine L., Halbert; Thomas R., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

A method for preparing molybdenum and sulfur containing compounds of the general formula X2 Mo2 S12.yH.sub.2 O, where X is a cation selected from the group consisting of Na+, K+, R4 N+, R3 NH+, R2 NH2+, RNH3+, NH4+, R4 P+, R4 As+,(R3 P)2 N+, R is a C1 -C30 alkyl, C6 -C30 aryl, C7 -C30 aralkyl or C2 -C30 alkoxyalkyl group and mixtures thereof, and y is from 0 to 2. The method comprises preparing a sulfide solution that contains from about 9 wt. % to about 13 wt. % sulfide sulfur; contacting the solution with elemental sulfur and a hydroxide; adding a molybdenum compound for a time and at a temperature sufficient to form a reaction mixture and a precipitate; separating the precipitate; and contacting the remaining reaction mixture with additional sulfide solution to form (NH4 )2 Mo2 S12.yH.sub.2 O. When compounds containing cations other than NH4+ are to be produced, the (NH4)2 Mo2 S12.yH.sub.2 O is contacted with a cation exchange compound containing a desired substitute cation selected ...

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Номер записи: 14
25-06-1991 дата публикации

Transition metal tris-dithiolene and related complexes as precursors to active catalysts

Номер: US0005026473A1
Автор: Halbert; Thomas R., Chianelli; Russell R., Stiefel; Edward I., Jacobson; Allan J.
Принадлежит: Exxon Research & Engineering Company

The present invention is based on the discovery that certain transition metal containing complexes thermally decompose to form solids containing the transition metal, sulfur and carbon and that these transition metal, sulfur and carbon containing solids are particularly suitable as catalysts for hydrodesulfurization, hydrodenitrogenation and aromatics hydrogenation. The transition metal complexes that are thermally decomposed to novel catalysts are complexes of the type represented by the general formula MLn 3, wherein M is selected from Mo, W, Re and mixtures thereof, L is a dithiolene or aminobenzenethiolate ligand, and n represents the total charge of the metal complexes, and is 0, -1, or -2.

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Номер записи: 15
02-10-1990 дата публикации

Desulfurization of hydrocarbons using molybdenum or tungsten sulfide catalysts promoted with low valent group VIII metals

Номер: US0004960506A1
Автор: Halbert; Thomas R., Stiefel; Edward I., Chianelli; Russell R., Ho; Teh C.
Принадлежит: Exxon Research and Engineering Company

Hydrocarbon feedstocks are selectively hydrodesulfurized by contacting the feedstock in the presence of hydrogen with a predecessor catalyst comprising molybdenum or tungsten sulfide which has been promoted by reaction with a transition metal containing organo-metallic complex wherein the valence of the metal is 0 or +1 at the time of reaction and the contacting is done at a temperature and pressure sufficient to substantially hydrodesulfurize the hydrocarbon.

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Номер записи: 16
09-10-1990 дата публикации

Transition metal tris-dithiolene and related complexes as precursors to active catalysts

Номер: US0004962077A1
Автор: Halbert; Thomas R., Chianelli; Russell R., Stiefel; Edward I., Jacobson; Allan J.
Принадлежит: Exxon Research and Engineering Company

The present invention is based on the discovery that certain transition metal containing complexes thermally decompose to form solids containing the transmission metal, sulfur and carbon and that these transition metal, sulfur and carbon containing solids are particularly suitable as catalysts for hydrodesulfurization, hydrodenitrogenation and aromatics hydrogenation. The transition metal complexes that are thermally decomposed to novel catalysts are complexes of the type represented by the general formula MLn3, wherein M is selected from Mo, W, Re and mixtures thereof, L is a dithiolene or aminobenzenethiolate ligand, and n represents the total charge of the metal complexes, and is 0, -1, or -2.

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Номер записи: 17
09-04-1985 дата публикации

Self-promoted molybdenum and tungsten sulfide hydrotreating catalysts from bis(tetrathiometallate) precursors

Номер: US0004510260A1
Автор: Stiefel; Edward I., Pan; Wie-Hin, Chianelli; Russell R.
Принадлежит: Exxon Research and Engineering Co.

Self-promoted molybdenum and tungsten sulfide hydrotreating catalyst are formed by heating one or more carbon-containing, bis(tetrathiometallate) catalyst precursor hydrogen with a supported, self-promoted catalyst salts selected from the group consisting of (NR4)2 [M(WS4)2 ], (NR4)x [M(MoS4)2 ] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is convalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe in a non-oxidizing atmosphere in the presence of sulfur hydrogen, and hydrocarbon.

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Номер записи: 18
21-07-1987 дата публикации

Dithioacid vanadium sulfide dimer compositions

Номер: US0004681958A1
Автор: Halbert; Thomas R., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

This invention relates to neutral complexes of dithioacid vanadium sulfide dimer and to a method of producing the complexes. The 1,1-dithioacid may be a dithiocarbamate, xanthate, dithiophosphate, dithiophosphinate or other similar ligand. The structure is generally of the form см. иллюстрацию в PDF-документе where L is a 1,1-dithioacid. The preferred dithioacid is dithiocarbamate. The compositions are suitable for producing hydrotreating catalysts or as a lubricant additive.

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Номер записи: 19
13-05-1986 дата публикации

(Disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes

Номер: US0004588829A1
Автор: Pan; Wie-Hin, Stiefel; Edward I.
Принадлежит: Exxon Research & Engineering Company

This invention relates to (disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes. More particularly, this invention relates to compounds of the formula MoS2 (S2 CNR2)3 which are mononuclear, eight-coordinate, neutral Mo(V) complexes containing only eight sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as lubricant additives.

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Номер записи: 20
08-04-1986 дата публикации

Hydrotreating using self-promoted molybdenum and tungsten sulfide catalysts formed from bis(tetrathiometallate) precursors

Номер: US0004581125A1
Автор: Stiefel; Edward I., Pan; Wie-Hin, Chianelli; Russell R., Ho; Teh C.
Принадлежит: Exxon Research and Engineering Co.

Hydrocarbon feeds are upgraded by contacting same, at elevated temperature and in the presence of hydrogen, with a self-promoted catalyst formed by heating one or more carbon-containing, bis(tetrathiometallate) catalyst precursor salts selected from the group consisting of (NR4)2 [M(WS4)2 ], (NR4)x [M(MoS4)2 ] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is covalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe composite in a non-oxidizing atmosphere in the presence of sulfur, hydrogen, and a hydrocarbon to form said supported catalyst.

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Номер записи: 21
08-03-1988 дата публикации

Heterometallic thiocubanes (C-2044)

Номер: US0004730064A1
Автор: Halbert; Thomas R., Cohen; Steven A., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

This invention relates to heterometallic thiocubane compositions containing the M21 M22 S4 cluster core and methods of making them wherein M1 is Re, V, Mo or W and M2 is Co, Cr, Cu, Ni or Fe but preferably Co. More particularly, the invention relates to compositions of the formula M22 M22 S4 L21 L22 L23 wherein M1 and M2 are as above, L1 is a bidentate sulfur or nitrogen bearing ligand (most preferably a dialkyldithiocarbamate), L2 is optional but may be an O, N, P or S-containing monodentate donor ligand, and L3 may be CO, a monodentate anion ligand such as a halide (preferably C1), mercaptide or alkoxide, or another O, N, P, or S containing monodentate donor ligand. The compositions are suitable for making active hydrotreating catalysts.

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Номер записи: 22
13-06-1989 дата публикации

Promoted molybdenum and tungsten sulfide catalysts, their preparation and use

Номер: US0004839326A1
Автор: Halbert; Thomas R., Stiefel; Edward I., Chianelli; Russell R., Ho; Teh C.
Принадлежит: Exxon Research and Engineering Company

This invention relates to a process for the preparation of promoted molybdenum and tungsten sulfide catalysts, the catalysts prepared by such process, and to the use of such catalysts for hydroprocessing processes, particularly hydrotreating. More particularly, this invention relates to the preparation and use of promoted catalysts useful for hydroprocessing processes such as hydrotreating wherein said catalysts are formed by treating molybdenum and tungsten sulfide-containing material (which may be supported) with a low valence promoter metal selected from transition metals particularly the group of Fe, Co, Ni.

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Номер записи: 23
30-06-1992 дата публикации

Method for making Mo4 S4 L66

Номер: US0005126465A1
Автор: Greaney; Mark A., Coyle; Catherine L., Stiefel; Edward I.
Принадлежит: Exxon Research and Engineering Company

There is provided an improved method for preparing compounds of the formula Mo4 S4 L6 comprising: heating a solution of a compound having the formula MoL4, wherein L is a 1,1-dithioacid ligand, at a temperature and for a time sufficient to form the Mo4 S4 L6 compound. Preferably, the MoL4 compound is dissolved in an organic solvent and the solution is heated at temperatures above 25° C., up to the boiling point of the solvent and, more preferably, at temperatures in the range of from about 50° C. to about 250° C.

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Номер записи: 24
15-10-1985 дата публикации

Compounds containing the [Co(MoS4)2 ]3- trianion and their preparation

Номер: US4547321A
Автор: Edward I. Stiefel, Stephen Mckenna, Wie-Hin Pan
Принадлежит: Exxon Research and Engineering Co

Compositions of the formula [(Cat n )] 3/n [Co(MoS 4 ) 2 ] wherein Cat is a mono, di or trivalent cation and n is 1, 2 or 3, respectively, have been prepared in non-aqueous media. The [Co(MoS 4 ) 2 ] 3- anion has the general structure ##STR1## Cat is preferably an alkyl substituted quaternary ammonium compound.

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Номер записи: 25
13-06-1989 дата публикации

Promoted molybdenum and tungsten sulfide catalysts, their preparation and use

Номер: US4839326A
Автор: Edward I. Stiefel, Russell R. Chianelli, Teh C. Ho, Thomas R. Halbert
Принадлежит: Exxon Research and Engineering Co

This invention relates to a process for the preparation of promoted molybdenum and tungsten sulfide catalysts, the catalysts prepared by such process, and to the use of such catalysts for hydroprocessing processes, particularly hydrotreating. More particularly, this invention relates to the preparation and use of promoted catalysts useful for hydroprocessing processes such as hydrotreating wherein said catalysts are formed by treating molybdenum and tungsten sulfide-containing material (which may be supported) with a low valence promoter metal selected from transition metals particularly the group of Fe, Co, Ni.

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Номер записи: 26
02-10-1990 дата публикации

Desulfurization of hydrocarbons using molybdenum or tungsten sulfide catalysts promoted with low valent group VIII metals

Номер: US4960506A
Автор: Edward I. Stiefel, Russell R. Chianelli, Teh C. Ho, Thomas R. Halbert
Принадлежит: Exxon Research and Engineering Co

Hydrocarbon feedstocks are selectively hydrodesulfurized by contacting the feedstock in the presence of hydrogen with a predecessor catalyst comprising molybdenum or tungsten sulfide which has been promoted by reaction with a transition metal containing organo-metallic complex wherein the valence of the metal is 0 or +1 at the time of reaction and the contacting is done at a temperature and pressure sufficient to substantially hydrodesulfurize the hydrocarbon.

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Номер записи: 27
25-06-1991 дата публикации

Transition metal tris-dithiolene and related complexes as precursors to active catalysts

Номер: US5026473A
Автор: Allan J. Jacobson, Edward I. Stiefel, Russell R. Chianelli, Thomas R. Halbert
Принадлежит: Exxon Research and Engineering Co

The present invention is based on the discovery that certain transition metal containing complexes thermally decompose to form solids containing the transition metal, sulfur and carbon and that these transition metal, sulfur and carbon containing solids are particularly suitable as catalysts for hydrodesulfurization, hydrodenitrogenation and aromatics hydrogenation. The transition metal complexes that are thermally decomposed to novel catalysts are complexes of the type represented by the general formula ML n 3, wherein M is selected from Mo, W, Re and mixtures thereof, L is a dithiolene or aminobenzenethiolate ligand, and n represents the total charge of the metal complexes, and is 0, -1, or -2.

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Номер записи: 28
09-10-1990 дата публикации

Transition metal tris-dithiolene and related complexes as precursors to active catalysts

Номер: US4962077A
Автор: Allan J. Jacobson, Edward I. Stiefel, Russell R. Chianelli, Thomas R. Halbert
Принадлежит: Exxon Research and Engineering Co

The present invention is based on the discovery that certain transition metal containing complexes thermally decompose to form solids containing the transmission metal, sulfur and carbon and that these transition metal, sulfur and carbon containing solids are particularly suitable as catalysts for hydrodesulfurization, hydrodenitrogenation and aromatics hydrogenation. The transition metal complexes that are thermally decomposed to novel catalysts are complexes of the type represented by the general formula ML n .sbsp.3, wherein M is selected from Mo, W, Re and mixtures thereof, L is a dithiolene or aminobenzenethiolate ligand, and n represents the total charge of the metal complexes, and is 0, -1, or -2.

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Номер записи: 29
13-09-1991 дата публикации

Multifunctional molybdenum and sulfur containing lube additives

Номер: CA2036783A1
Автор: Catherine L. Coyle, Edward I. Stiefel, Mark A. Greaney
Принадлежит: Exxon Research and Engineering Co

ABSTRACT OF THE DISCLOSURE In accordance with this invention, there is provided a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula MoL4 wherein L is a ligand selected from thioxanthates and mixtures thereof and, in particular, thioxanthates having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the thioxanthate ligand, L, will have from about 2 to about 30 carbon atoms.

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Номер записи: 30
30-06-1992 дата публикации

Method for making Mo4 S4 L6

Номер: US5126465A
Автор: Catherine L. Coyle, Edward I. Stiefel, Mark A. Greaney
Принадлежит: Exxon Research and Engineering Co

There is provided an improved method for preparing compounds of the formula Mo 4 S 4 L 6 comprising: heating a solution of a compound having the formula MoL 4 , wherein L is a 1,1-dithioacid ligand, at a temperature and for a time sufficient to form the Mo 4 S 4 L 6 compound. Preferably, the MoL 4 compound is dissolved in an organic solvent and the solution is heated at temperatures above 25° C., up to the boiling point of the solvent and, more preferably, at temperatures in the range of from about 50° C. to about 250° C.

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Номер записи: 31
10-03-1987 дата публикации

Bulk and supported, self-promoted molybdenum and tungsten sulfide catalysts formed from bis(tetrathiometallate) precursors, their preparation and use as for hydrotreating

Номер: CA1218981A
Автор: Edward I. Stiefel, Russell R. Chianelli, Teh C. Ho, Wie-Hin Pan
Принадлежит: Exxon Research and Engineering Co

ABSTRACT OF THE DISCLOSURE Hydrocarbon feeds are upgraded by contacting a feed, at a elevated temperature and in the presence of hydrogen, with either a bulk or supported, self-promoted catalyst formed by compositing a porous, refractory inorganic oxide, support with one or more complex salts selected from the group consisting of (NR4)2[M(WS4)2], (NR4)x [M(moS4)2] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is covalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe and heating said composite in a non-oxidizing atmosphere in the presence of sulfur and hydrogen and a hydrocarbon to form said supported catalyst. The bulk catalysts are formed in the absence of a support material.

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Номер записи: 32
28-02-1989 дата публикации

(disulfido)tris(n,n-substituted dithiocarbamato) mo(v) complexes

Номер: CA1250590A
Автор: Edward I. Stiefel, Wie-Hin Pan
Принадлежит: Exxon Research and Engineering Co

ABSTRACT OF THE DISCLOSURE This invention relates to (disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes. More particularly, this invention relates to compounds of the formula MoS2(S2CNR2)3 which are mononuclear, eight-coordinate, neutral Mo(V) complexes containing only eight sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as lubri-cant additives.

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Номер записи: 33
27-05-2003 дата публикации

Manufacture of lubricant additives

Номер: US6569820B2
Автор: Alisdair J. Brown, Edward I. Stiefel, Ernestine W. Hill, Ian A. W. Bell, Jonathan M. McConnachie, Stanley J. Brois
Принадлежит: Infineum International Ltd

Oil-soluble or oil-dispersible trinuclear molybdenum-sulfur compounds are made by reacting, in a polar medium, a reactant molybdenum compound containing an anion that possesses a trinuclear molybdenum core, and a dithiocarbamate that is produced in situ.

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Номер записи: 34
07-07-1992 дата публикации

Heterometallic thiocubanes

Номер: CA1304745C
Автор: Edward I. Stiefel, Steven A. Cohen, Thomas R. Halbert
Принадлежит: Exxon Research and Engineering Co

ABSTRACT OF THE DISCLOSURE This invention relates to heterometallic thiocubane compositions containing the M?M?S4 cluster core and methods of making them wherein Ml is Re, V, Mo or W and M2 is Co, Cr, Cu, Ni or Fe but preferably Co. More particularly, the invention relates to compositions of the formula M?M?S4L?L?L? wherein M1 and M2 are as above, L1 is a bidentate sulfur or nitrogen bearing ligand (most preferably a dialkyldithiocarbamate), L2 is optional but may be an O, N, P or S-containing monodentate donor ligand, and L3 may be CO, a mono-dentate anion ligand such as a halide (preferably Cl), mercaptide or alkoxide, or another O, N, P, or S containing monodentate donor ligand. The composi-tions are suitable for making active hydrotreating catalysts.

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Номер записи: 35
13-05-1986 дата публикации

(Disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes

Номер: US4588829A
Автор: Edward I. Stiefel, Wie-Hin Pan
Принадлежит: Exxon Research and Engineering Co

This invention relates to (disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes. More particularly, this invention relates to compounds of the formula MoS 2 (S 2 CNR 2 ) 3 which are mononuclear, eight-coordinate, neutral Mo(V) complexes containing only eight sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as lubricant additives.

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Номер записи: 36
08-07-1986 дата публикации

Compounds containing the ¬co(mos.sub.4).sub.2|.sup.3-trianion and preparation their preparation

Номер: CA1207126A
Автор: Edward I. Stiefel, Stephen Mckenna, Wie-Hin Pan
Принадлежит: Exxon Research and Engineering Co

ABSTRACT OF THE DISCLOSURE Compositions of the formula [(Catn)]3/n [Co(MoS4)2] wherein Cat is a mono, di or trivalent cation and n is l, 2 or 3, respectively, have been prepared in non-aqueous media. The [Co(MoS4)2]3- anion has the general structure

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Номер записи: 37
15-06-1991 дата публикации

Molybdenum sulfur antiwear and antioxidant lube additives

Номер: CA2030280A1
Автор: Catherine L. Coyle, Edward I. Stiefel, James N. Francis, Mark A. Greaney, Morton Beltzer
Принадлежит: Exxon Research and Engineering Co

In accordance with this invention, there is provided a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula Mo2L4 wherein L is a ligand selected from xanthates and mixtures thereof and, in particular, xanthates having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the xanthate ligand, L, will have from about 2 to 30 carbon atoms.

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Номер записи: 38