40results about How to "Improve anti-sintering" patented technology

The invention discloses a Ni-based catalyst adopting a core-shell structure and used in DRM (dry reforming of methane) and a preparation method. A Ni-MOx@SiO2 (M is Zr, La and Ce) multi-core core-shell material is prepared with a reversed-phase microemulsion method with nickel nitrate, zirconium nitrate and the like as precursor salt. The additive amount of metal oxide in the catalyst is 1%-5% ofthe weight of the catalyst and the additive amount of nickel is 5%-10% of the weight of the catalyst. The sintering resistance and carbon deposit resistance of the catalyst are remarkably enhanced dueto addition of the metal oxide. The catalyst shows high activity, high stability and extremely high carbon deposit resistance and sintering resistance under the reaction conditions of normal pressure, reaction gas composition CH4:CO2 being 1.05:1, the air speed being 1,8000 ml.gcat<-1>.h<-1> and the reaction temperature being 800 DEG C. The catalyst has the advantages of being simple to prepare,free of secondary pollution to the environment, low in cost, high in catalytic efficiency and the like.

An electric catalyst used for proton exchange membrane fuel cells, active component is Pt or PtRu, auxiliary component is titanium oxide; the atom ratio of platinum and titanium is 0.01-99, the atom ratio of platinum and ruthenium is 0.01-99, the particle size of the active component is 1-20nm. The active component can be impregnated in the titanium oxide modified porous conductive material, gained support-type electric catalyst, which contained activity group sharing percentage for the quality of 1-99%, the atom ratio of platinum and titanium is 0.01-99. Active components can be added as a percentage of 0-99% of the auxiliary components, become a multi-component catalysts; adding auxiliary components was transition metal or a transition metal oxides or several. Preparation methods can be used colloidal law or impregnation - Reduction Act. The invention of the electric catalyst can be used in proton exchange membrane fuel cells.

The invention discloses a preparation method for rapidly preparing a highly-dispersed nickel-based catalyst for methane reforming with carbon dioxide. A high-temperature-resistant mesoporous material with a large specific surface area and ordered mesoporous passages is adopted as a carrier of the catalyst, a nickel precursor salt and the mesoporous material are ground and stirred to uniformly disperse the nickel precursor salt on the surface of the mesoporous material carrier which is not de-molded by adopting a solid-state grinding method, and during drying, the nickel precursor salt enters the passages to obtain a nickel catalyst with highly-dispersed active ingredients and high carbon deposition resistance and sintering resistance by calcination and H2 reduction. The preparation method has the advantages of simple preparation process, high catalysis efficiency, energy saving (calcination is not required during preparation of the carrier), uniform distribution of the active ingredients and the like.

The invention relates to a catalyst and preparation method for preparing synthesis gas through a reforming reaction of CO<2> and CH<4>. The catalyst is formed by mixing a nickel-base part, namely Ni/gamma-Al<2>O<3> (component I), with a carbon material part (component II). In the preparation process, organic solvent serves as impregnation liquid, and ultrasonic intensifying treatment is conducted in a matched mode so that active site points of the nickel-base part can be increased, and the dispersity of active components can be improved. The carbon material is utilized for replacing part of the nickel-base component, cost of the catalyst can be lowered, and meanwhile the carbon material serves as a modulation auxiliary agent and conducts regulation and control on the nickel-base part. In the reaction process, through the synergistic effect of the nickel-base part and the carbon material part, the activity and stability of the catalyst can be enhanced, and the anti-sintering performance and anti-carbon-deposit performance of the catalyst can be improved. The catalyst has the advantages that the cost is low, raw materials are easy to obtain, and catalytic activity is good.

The invention relates to a preparation method of a zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst. According to the method, acid-treated two-dimensional layered porous vermiculite is taken as a carrier, and zirconium dioxide and nickel metal are anchored in a mesoporous structure of a layered molecular sieve at the same time through a co-initial wet immersion high-temperature reduction method, so that the zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst rich in Ni-Zr interfaces and a large number of oxygen vacancies is prepared. The preparation method has the advantages that the preparation process is easy to operate, the process energy consumption is low, the preparation method is good in repeatability and the like, the prepared catalyst has the advantages of being small in metal particle, uniform in dispersion, high in reactant adsorption and activation capacity and the like, and the Ni-Zr interface effect and oxygen vacancies rich in the zirconium dioxide auxiliary play a synergistic effect; the prepared catalyst has the advantages of high sintering resistance and carbon deposition resistance at high temperature and the like. The method has a good prospect when being applied to the reaction for preparing the synthesis gas by reforming the methane and the carbon dioxide.

The invention relates to a modified boron nitride loaded nickel-based methane dry reforming catalyst as well as a preparation method and application thereof. According to the method, different stripping methods are used for modifying the boron nitride, then the modified boron nitride is used as a carrier for supporting the active metal Ni, and the excellent sintering resistance and carbon deposition resistance are achieved in the methane dry reforming reaction. According to the invention, the content of Ni is adjusted by using a simple impregnation method, and the modified boron nitride loaded nickel catalyst with high activity and high stability is obtained. The catalyst can be used for solving the problems of sintering and serious carbon deposition of active components in a methane dry reforming reaction. The catalyst has the advantages of simple preparation process, low cost and high catalytic efficiency.

The invention belongs to the field of methanation catalysis, and relates to an organic silicon waste contact body borne nickel-based methanation catalyst and a preparation method therefor. The catalyst comprises a carrier, an active component, a modifier and an auxiliary agent, wherein the carrier is an organic silicon waste contact body, the modifier is a porous inorganic oxide, the active component is Ni, and the auxiliary agent is a transition metal oxide. By using the porous inorganic oxide modifier in the invention, on one hand, the interacting force between the active component and the carrier is enhanced, and the dispersibility of the active component is improved; on the other hand, the inorganic oxide dispersed in the active component further serves as a physical barrier, and suppresses agglomeration and sintering of Ni particles. The catalyst obtained in the invention is high in catalytic activity, high in anti-carbon deposition and anti-sintering performance and low in cost, and particularly suitable for methanation reaction systems of high-concentration CO.

The invention relates to a chemical composition plating method for preparing a supported platinum bimetallic alloy composite material, which belongs to the technical field of the preparation of the bimetallic alloy material. A chemical platinum plating layer prepared by using the single platinum chemical planting method has bad performance and higher cost. For improving the performance of the single platinum planting layer and reducing the usage of the noble platinum, the invention provides the chemical composition plating method for depositing a platinum bimetallic alloy, which comprises three steps of pretreatment of a matrix, activation of the matrix, chemical composition plating and heat treatment after planting. After being subjected to pretreatment and activation, inorganic oxides, composite oxides and a carbon carrier or a molecular sieve matrix are added into platinum-rhenium or platinum-iridium bimetallic chemical plating solution to carry out bimetallic chemical composition planting, and the obtained sample is subjected to heat treatment to obtain the supported platinum bimetallic alloy composite material. The platinum bimetallic alloy composite material prepared by the method has the characteristics of low cost, sintering resistance and excellent catalytic performance.

The invention relates to the technical field of preparation and application of a catalyst for preparing synthetic natural gas from coke oven gas and coal and particularly relates to a preparation method of a nickel-containing mesoporous catalyst. The method comprises the following steps: taking aluminum oxide as a carrier, taking nickel oxide as a main active component and taking magnesium oxide and cobalt oxide as additives, preparing a catalyst precursor by using a method of coprecipitating nitrate and sodium aluminate, then roasting at the high temperature to prepare the catalyst. According to the nickel-containing mesoporous catalyst prepared by the method, all the components of the catalyst are uniformly dispersed, so that the dispersity of nickel which is used as the active component is improved; through the formed regular pores, the specific surface area of the catalyst is increased, so that the active site is in full contact with the raw material gas and rapidly carries out methanation; the magnesium oxide and the cobalt oxide which are used as the additives are added, the sintering resistance and the inhibition of carbon deposition of the catalyst in the high-temperature reaction environment are improved, and meanwhile, the selectivity is also improved. The catalyst has high low-temperature activity; the catalyst can be activated at 200 DEG C; the conversion ratio of CO can reach up to 98% at 230 DEG C; the selectivity of CH4 is greater than 96%.

The invention belongs to the technical field of catalysts, and particularly relates to a porous material and a preparation method and application thereof. The preparation method of the porous materialprovided by the invention comprises the following steps: mixing and stirring silicon-containing slurry and an aluminum-containing compound to obtain silicon-aluminum slurry; adding a template agent and an alkali metal and/or alkaline earth metal compound into the silicon-aluminum slurry, carrying out stirring and aging to obtain aged slurry; and carrying out centrifugal separation on the aged slurry to obtain a solid crude product, and drying and roasting the solid crude product to obtain the porous material. According to the preparation method of the porous material provided by the invention, the pore diameter, specific surface area and pore volume of the material can be greatly improved, and the catalytic activity and stability of the material can also be improved.