Method for preparing cerium hydroxide nano rod

The invention relates to a method for preparing a cerium hydroxide nano rod, which relates to the preparation technology of nano rods. The method comprises the following steps of: taking a soluble cerous salt as a precursor; adding an excessive alkaline material as a precipitant; reacting the alkaline material under an alkali condition; then transferring the alkaline material into a kettle; heating for 10 to 24 hours at a constant temperature of between 100 and 240 DEG C; reducing the temperature to a room temperature; separating the precipitate; and washing and drying the precipitate to obtain the cerium hydroxide nano rod. The cerium hydroxide nano rod prepared by the method has a good uniformity, a simple preparation process as well as a diameter of 20nm and a length of 250 to 300 nm which are proved by the electron microscopy. The size of the cerium hydroxide nano rod can be adjusted by simply regulating and controlling the heat of water, the reaction temperature and the reaction time ...

Amphiphilic porous hollow carbon microsphere as well as preparation method and application thereof

The invention discloses an amphiphilic porous hollow carbon microsphere, a preparation method thereof, applications of the amphiphilic porous hollow carbon microsphere as a carrier in enriching and loading of active molecules or a catalyst, and a method for separating and recovering the porous hollow carbon microsphere from a dispersion system by utilizing the amphipathy. The method comprises thefollowing steps of: dispersing microzyme in an aqueous solution of a cytoderm surface protectant; and then, carrying out carbonation treatment to obtain the amphiphilic porous hollow carbon microsphere. The prepared hollow carbon microsphere has a pore size capable of being controlled in the mesoporous and macroporous range as required, and can be suitable for the loading, the storage and the transmission of guest molecules in different sizes; by utilizing the characteristic of the amphiphilic porous hollow carbon microsphere capable of spontaneously transferring to a two-phase interface froma polar ...

Preparation method for nanometer strontium titanate cube

The invention relates to a preparation method for a nanometer strontium titanate cube. According to the method, titanium dioxide is used as a titanium source, a soluble strontium salt is used as a strontium source, and sodium hydroxide is used as an acidifying or alkalizing agent. The method comprises the following steps: ultrasonically dispersing titanium dioxide in an aqueous solution, then adding a soluble salt containing strontium, carrying out continuous stirring to allow the soluble salt to be dissolved, then adding alkali, adjusting the pH value of a suspending liquid to 8 to 14, then adding a suspension into a reaction vessel and carrying out a hydro-thermal reaction; and subjecting a reaction product to washing, separating and drying so as to obtain the nanometer strontium titanate cube with structured morphology and a uniform size. Compared with a conventional wet chemical method, the method provided by the invention has the following advantages: an organic titanium source is ...

Precious metal-rare earth alloy nanocluster catalyst as well as preparation method and application thereof

The invention provides a noble metal-rare earth alloy nanocluster catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts and preparation thereof. Comprising the following steps: ball-milling, mixing and roasting a carbon material, a nitrogen source and a phosphorus source to obtain a nitrogen-phosphorus functionalized active carbon carrier; mixing the nitrogen and phosphorus functionalized active carbon carrier with water and rare earth salt, stirring, drying the obtained solid, and roasting at high temperature to obtain a composite carrier; and mixing the composite carrier with water and noble metal salt, stirring, drying the obtained solid, and carrying out reduction roasting to obtain the noble metal-rare earth alloy nanocluster catalyst. The invention overcomes the defects of high catalyst cost, low electrolysis efficiency, poor stability and the like of the existing proton exchange membrane electrolyzed water.

Method for preparing cerium dioxide nano-tube

The invention provides a method for preparing a cerium dioxide nano-tube, which relates to a nano-tube technique. The method takes soluble cerium salt as precursor and excess sodium hydroxide as precipitator, which react under alkaline condition and then are moved to a reaction kettle to be heated for 10 to 24 hours under temperature of 100 to 160 DEG C; the sediment is separated, washed and dried under room temperature after cooled to the room temperature; the sediment prepared is dispersed into 1 to 5 percent of oxydol solution for being treated for 1 to 2 hours under ultrasonic; then the cerium dioxide nano-tube is prepared after separating, washing and drying.The cerium dioxide nano-tube prepared by the method of the invention has the advantages of good homogeneity, simple preparation method, cheap and easy-acquiredraw material, simple and feasible preparation technique and low cost. The thickness of the cerium dioxide nano-tube ranges from 5 to 7 nm, and the inner diameter is 10-20nm ...

Method for preparing composite perovskite oxide loaded palladium catalyst

Precious metal-based alloy catalyst as well as preparation method and application thereof

The invention provides a noble metal-based alloy catalyst as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation and electro-catalysis. Comprising the following steps: ball-milling and mixing a carbon material and a phosphorus source, and roasting a dried solid to obtain a phosphorus functionalized carrier; mixing the phosphorus functionalized carrier with water and precious metal salt, stirring, and carrying out reduction roasting on the obtained solid product to obtain precious metal seed crystals; and mixing the noble metal seed crystal with water and non-noble metal salt, stirring, and carrying out high-temperature roasting on the obtained solid product to obtain the noble metal-based alloy catalyst. The noble metal content of the prepared catalyst is only 10% of that of a commercial catalyst, and the catalyst has catalytic performance superior to that of commercial platinum carbon and excellent stability.

Nano palladium supported amphipathic carbon sphere catalyst and application thereof to aqueous-phase Heck reaction

The invention belongs to the technical field of green catalysis, and particularly relates to a method for catalyzing an aqueous-phase Heck reaction in the presence of palladium nano particle supported amphipathic carbon spheres. The method is characterized in that the palladium nano particle supported carbon sphere catalyst (Pd/PHCSs) is synthesized in situ by adopting carbon spheres (PHCSs), which are synthesized in a hydrothermal method, as a carrier, PdCl2 as a precursor and ethanol as a solvent and a reduction agent. The catalyst can be applied to the aqueous-phase Heck reaction and is high in catalytic activity; moreover, the synthesis process of the catalyst is simple, and the catalyst is recyclable and is free of environment pollution.

Hollow polysaccharide microsphere immobilized enzyme and preparation method thereof

The invention discloses a hollow polysaccharide microsphere immobilized enzyme and a preparation method thereof. The hollow polysaccharide microsphere immobilized enzyme comprises enzyme and a carrier, wherein the carrier is hollow polysaccharide microsphere; and the preparation method of the hollow polysaccharide microsphere comprises the steps of carbonizing yeast in liquid at a constant temperature and obtaining the hollow polysaccharide microsphere, wherein the constant temperature is any temperature from 150 to 240 DEG C. The invention also discloses a preparation method for the hollow polysaccharide microsphere immobilized enzyme. The hollow polysaccharide microsphere immobilized enzyme prepared by the method has a wide raw material source for preparing the carrier, and is simple and easy in technology of carrier preparation, surface modification and enzyme immobilization; in addition, the carrier is characterized by high specific surface area, large inner space, rich surface functional ...

Method for preparing cerium dioxide nano cubic block

The invention provides a method for preparing the nanometer cubic of cerium dioxide, which relates to the technology of nanometer cubic. The method adopts dissoluble cerium salt as a pioneering substance and excessive sodium hydroxide as a precipitant, then the reaction is carried out under the alkali condition; removes the substances to a reaction vessel and heats the substance at a constant temperature of 180-240 DEG C for 10-24 hours, then cools the reaction vessel to room temperature, separates, washes and dries the precipitate to obtain a nanometer tube of cerium dioxide. The nanometer cubic of cerium dioxide prepared by the method has good homogeneity, the production method is simple and the granule diameter can be regulated within the range of 20-360nm, the raw material is cheap and easy to be purchased, the preparing technique is simple and feasible and the cost is low.

Hollow polysaccharide microsphere immobilized enzyme and preparation method thereof

The invention discloses a hollow polysaccharide microsphere immobilized enzyme and a preparation method thereof. The hollow polysaccharide microsphere immobilized enzyme comprises enzyme and a carrier, wherein the carrier is hollow polysaccharide microsphere; and the preparation method of the hollow polysaccharide microsphere comprises the steps of carbonizing yeast in liquid at a constant temperature and obtaining the hollow polysaccharide microsphere, wherein the constant temperature is any temperature from 150 to 240 DEG C. The invention also discloses a preparation method for the hollow polysaccharide microsphere immobilized enzyme. The hollow polysaccharide microsphere immobilized enzyme prepared by the method has a wide raw material source for preparing the carrier, and is simple andeasy in technology of carrier preparation, surface modification and enzyme immobilization; in addition, the carrier is characterized by high specific surface area, large inner space, rich surface functional ...

Preparation method of cerium-based rare earth binary one-dimensional oxide solid solution

The invention relates to a preparation method of a cerium-based rare earth binary one-dimensional oxide solid solution. A soluble trivalent rare earth salt is used as a precursor, and excessive alkali substances are added as a precipitant; a cerium-based rare earth binary hydroxide solid solution is obtained by hydrothermal process, then the obtained hydroxide is roasted at the temperature of 300-500 DEG C for 3-10 hours so that the oxide solid solution Ce(1-x)RExO(2-x/2) can be obtained, wherein x is the mole fraction of the dopant, and x is more than 0 and less than 1, namely, the amount of the dopant can be optionally changed within the range of 0-100%; RE is a trivalent rare earth element such as Sm, La, Y, Gd and the like. The cerium-based rare earth binary one-dimensional oxide solid solution obtained in the preparation method has the advantages of good homogeneity and simple preparation method; and the oxygen vacancy concentration in the solid solution can be adjusted within a relatively ...

Method for preparing cerium dioxide nano-tube

The invention provides a method for preparing a cerium dioxide nano-tube, which relates to a nano-tube technique. The method takes soluble cerium salt as precursor and excess sodium hydroxide as precipitator, which react under alkaline condition and then are moved to a reaction kettle to be heated for 10 to 24 hours under temperature of 100 to 160 DEG C; the sediment is separated, washed and driedunder room temperature after cooled to the room temperature; the sediment prepared is dispersed into 1 to 5 percent of oxydol solution for being treated for 1 to 2 hours under ultrasonic; then the cerium dioxide nano-tube is prepared after separating, washing and drying.The cerium dioxide nano-tube prepared by the method of the invention has the advantages of good homogeneity, simple preparationmethod, cheap and easy-acquiredraw material, simple and feasible preparation technique and low cost. The thickness of the cerium dioxide nano-tube ranges from 5 to 7 nm, and the inner diameter is 10-20nm ...

Biocompatible hollow polysaccharide microsphere and preparation method thereof

The invention discloses a biocompatible hollow polysaccharide microsphere and a preparation method thereof. The preparation method of the biocompatible hollow polysaccharide microsphere comprises the steps of carbonizing yeast in liquid at a constant temperature and obtaining the hollow polysaccharide microsphere, wherein the constant temperature is any temperature from 150 to 240 DEG C; the liquid can be water, or can be an aqueous solution of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, sodium chloride, potassium chloride, potassium acetate, ethanol, acetaldehyde or glutaraldehyde; and the yeast can be dead or active. The hollow polysaccharide microsphere prepared by the method is in the shape of a sphere, an apple or a jar, and can be a hollow microsphere of which the sphere wall is complete or is provided with a hole. The preparation method of the biocompatible hollow polysaccharide microsphere has the advantages of cheap and readily available raw materials, simple practicable ...

Formaldehyde room temperature elimination catalyst

The invention relates to a formaldehyde room temperature purification nano-palladium-loaded nano cerium oxide catalyst. A nano cerium oxide cubic block is used as a carrier, and the surface of the carrier is loaded with the nano palladium by deposition-precipitation method to obtain the loaded type catalyst. The formaldehyde room temperature purification loaded type catalyst can convert most or all of the formaldehyde under the condition of room temperature into carbon dioxide and water without production of by-product of formic acid, carbon monoxide, and the like, and the formaldehyde conversion rate is up to 100%.

Biocompatible hollow polysaccharide microsphere and preparation method thereof

The invention discloses a biocompatible hollow polysaccharide microsphere and a preparation method thereof. The preparation method of the biocompatible hollow polysaccharide microsphere comprises thesteps of carbonizing yeast in liquid at a constant temperature and obtaining the hollow polysaccharide microsphere, wherein the constant temperature is any temperature from 150 to 240 DEG C; the liquid can be water, or can be an aqueous solution of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, sodium chloride, potassium chloride, potassium acetate, ethanol, acetaldehyde or glutaraldehyde; and the yeast can be dead or active. The hollow polysaccharide microsphere prepared by the method is in the shape of a sphere, an apple or a jar, and can be a hollow microsphere of which the sphere wall is complete or is provided with a hole. The preparation method of the biocompatible hollow polysaccharide microsphere has the advantages of cheap and readily available raw materials, simple practicable ...

Data request processing method and system based on artificial intelligence

The invention relates to a data request processing method and system based on artificial intelligence. The method comprises the following steps: submitting user request information; acquiring historical data from a data platform according to identity information in the user request information; calculating a first-time processing data volume according to the first request data volume of the user and the user processing mode, and analyzing whether the user has the processing capability according to the first-time processing data volume and the acquired data volume information; carrying out processing capability grade division on the user with the processing capability according to the request record, the overtime processing record and the unprocessed data volume information of the user, and outputting a processing capability grade list; evaluating the processing capability level list and the users without the processing capability, and outputting an evaluation result; generating a request ...

一种钙钛矿复合氧化物负载钯催化剂的制备方法

The preparation process of composite perovskite oxide loaded palladium catalyst includes the main steps of: compounding soluble metal salt solution with soluble salt of La, Co and Pd as material; dropping metal salt solution into citric acid as complexing agent to form sol; heating sol at 50-95 deg.c while stirring to obtain gel; drying at 110-160 deg.c for 10-24 hr and roasting at 600-1000 deg.c for 3-24 hr; and reduction processing of the obtained perovskite oxide. The catalyst is determined via X-ray powder diffraction process, hydrogen adsorption process and programmed heating-up desorption process to obtain its crystal phase, surface Pd density and oxygen adsorbing performance. The prepared catalyst is perovskite oxide loaded palladium catalyst with oxygen fault, and this structure has synergist effect of perovskite and Pd and excellent catalytic activity.

Multilevel configurable verification method and system based on supervision data management

The invention discloses a multi-level configurable verification method and system based on supervision data management, and the method comprises the steps: obtaining data generated by a data generation layer, enabling the data generated by the data generation layer to serve as a hub of data exchange between systems through a data exchange layer, carrying out the bidirectional exchange of data among the data generation layer, a data integration layer and a data application layer, and carrying out the verification of the multi-level configurable verification. The data integration layer integrates the data subjected to data exchange according to a certain rule and then uniformly stores the data so as to facilitate subsequent query and analysis, and the data application layer mainly stores original data and derivative data provided on the basis of the data integration layer, performs corresponding processing according to service requirements, provides result data or interface data required ...

Data detection method and system based on big data behavior analysis

The invention relates to a data detection method and system based on big data behavior analysis, and relates to the technical field of data security, and the method comprises the steps that a data acquisition module acquires to-be-received data of a terminal; the data detection module performs source detection and data volume detection on the to-be-received data; a data analysis module determines an analysis mode for the to-be-received data subjected to source detection and data volume detection; determining an optimization mode of the analysis mode according to the complexity difference value; source detection and data volume detection are carried out on the to-be-received data of the terminal, and the analysis mode during data analysis is determined according to the detection result, so that the safety and reliability of the data source are ensured, and the coding complexity of the to-be-received data is analyzed. And when the corresponding coding complexity is at different levels, the ...

Magnetic hollow compound micro-structure immobilized enzyme and method for preparing same

The invention discloses a magnetic hollow compound micro-structure immobilized enzyme and a method for preparing the same. The immobilized enzyme comprises enzyme and a carrier for immobilizing the enzyme, wherein the carrier is a magnetic hollow polysaccharide microsphere consisting of a core and a shell; the shell covers the outer surface of the core and is formed by ferrites; the core is a hollow polysaccharide microsphere; and the method for preparing the hollow polysaccharide microsphere comprises a step of carbonizing yeast in liquid to obtain the hollow polysaccharide microsphere undera condition of constant temperature which is any constant temperature between 150 and 240 DEG C. The invention also discloses a method for preparing the immobilized enzyme. The magnetic hollow compound micro-structure immobilized enzyme has high pheron-carrying quantity, high enzymatic activity and strong enzymatic stability and operational stability and can be easily recovered under a condition of ...

Magnetic hollow compound microstructure preparation method

The invention provides a magnetic hollow compound microstructure preparation method, comprising the following steps: adopting spherical, apple-shaped and jar-shaped polysaccharide microspheres as templates, and coating series magnetic materials such as ferroferric oxide, ferrite and the like on the hollow polysaccharide microstructure compactly under 160-250 DEG C of hydrothermal condition to obtain spherical, apple-shaped and jar-shaped magnetic hollow compound microstructure. By observing under electron microscopy, the particle size of the magnetic materials coated on the surface of the polysaccharide microspheres is uniform and is about 50nm. The magnetic force test shows that the microstructure has good superparamagetism. The method has simple process and low cost.

Rare earth monatomic-noble metal cluster composite catalyst as well as preparation method and application thereof

The invention provides a rare earth monatomic-noble metal cluster composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of material science and the field of electro-catalysis. The mass percentage content of the noble metal in the rare earth monatomic-noble metal cluster composite catalyst is 0.28%-1.2%, and the mass percentage content of the rare earth monatomic is 0.02%-0.03%; the noble metal comprises ruthenium or rhodium; the rare earth single atoms comprise cerium single atoms or lanthanum single atoms. The composite catalyst contains atomic-scale dispersed rare earth single atoms and noble metal clusters with the average size of 1 nm at the same time, and by introducing atomic-scale dispersed cerium single atoms, the alkaline hydrogen evolution performance of the noble metal cluster catalyst is greatly improved, so that the catalyst achieves excellent hydrogen production performance when the use amount of noble metal is extremely ...

Preparation method of bionic flagellate nanowire

The invention provides a preparation method of a bionic flagellate nanowire, and relates to the technical field of nanowire material preparation. Comprising the following steps: mixing a trithiocyanuric acid solution with a copper hydroxide nanowire, dipping, and drying to obtain a dipped nanowire; the dipping conditions are as follows: the temperature is 20-45 DEG C, and the time is 0.01-50 minutes; and calcining the obtained impregnated nanowire at the temperature of 250-500 DEG C for 2-6 hours. According to the preparation method, Cu (OH) 2 nanowires are soaked in a trithiocyanuric acid solution and then calcined in a muffle furnace. The method provided by the invention is simple to operate, and the prepared nanowire is uniform and controllable in morphology and can be applied to the fields of oil-water separation, battery cathode current collectors, adsorption and the like.

Magnetic hollow compound micro-structure immobilized enzyme and method for preparing same

The invention discloses a magnetic hollow compound micro-structure immobilized enzyme and a method for preparing the same. The immobilized enzyme comprises enzyme and a carrier for immobilizing the enzyme, wherein the carrier is a magnetic hollow polysaccharide microsphere consisting of a core and a shell; the shell covers the outer surface of the core and is formed by ferrites; the core is a hollow polysaccharide microsphere; and the method for preparing the hollow polysaccharide microsphere comprises a step of carbonizing yeast in liquid to obtain the hollow polysaccharide microsphere undera condition of constant temperature which is any constant temperature between 150 and 240 DEG C. The invention also discloses a method for preparing the immobilized enzyme. The magnetic hollow compound micro-structure immobilized enzyme has high pheron-carrying quantity, high enzymatic activity and strong enzymatic stability and operational stability and can be easily recovered under a condition of ...

Catalyst for catalysis of biological oil hydrodeoxygenation reaction in water phase or water-oil two phase

The present invention in particular relates to a hollow carbon sphere supported nano palladium catalyst used for catalysis of biological oil hydrodeoxygenation reaction in water phase or water-oil two phase, a hollow carbon sphere (CM) is used as a carrier, and the carbon sphere supported palladium nano particle (Pd / CM) catalyst can be synthesized by the impregnation reduction method by use of PdCl2 as a precursor. The Pd / CM catalyst can be effectively dispersed in water, can also form Pickering emulsion in a water-oil two phase system, and can be sued for efficient catalysis of biological oil hydrodeoxygenation reaction in water phase or water-oil two phase, the obtained product is easy to separate, and the catalyst can be recycled.