35results about How to "High metal dispersion" patented technology

A catalyst for synthesizing the intermediate oil from synthetic gas by Fischer-Tropsch reaction contains Co (5-35 Wt%), mesoporous ZrO2 as carrier (53-93), noble metal (0-2) and oxide of non-noble metal. Its preparing process includes such steps as impregnating said carrier in the aqueous solution of nitrate containing the oxide of non-noble metal or the alcohol solution of organic alkydester, and impregnating it in the equeous solution of cobalt nitrate and the nitrate (or chloride) or noble metal. It has high activity, stability, selectivity and mechanical performance.

A catalyst for Fischer-Tropsch synthesis consists of Co 10.0-80.0 wt%, zirconia 15.0-85.0 wt% and other metal oxide 0-5.0 wt%, and is prepared by the codeposition process or soaking process. The catalyst has excellent stability, high reduction degree and high metal dispersivity.

A series of ternary oxide and quaternary oxide catalysts were prepared and evaluated for various reforming processes. Representative examples of these catalysts were found to be active and stable for all the processes tested verifying the “feedstock and process flexible” nature of these catalysts. Thus, feedstock- and process-flexible reforming catalysts for hydrogen and/or syngas production have been developed.

The present invention belongs to the field of catalyst preparing technology, and is especially supported nanometer metal catalyst preparing process and apparatus. The process includes diffusing metal salt solution from metering pump to mixed slurry solution comprising reductant and carrier material through the micropores in the ceramic film pipe under ultrasonic introduction for metal ion to be adsorbed and reduced in the surface of catalyst carrier, the subsequent centrifugal separation, washing the precipitant with deionized water, stoving and burning to form the supported nanometer metal catalyst. The present invention has the advantages of homogeneous distribution of active catalyst component, small size, high metal dispersion, etc.

The present invention is preparation process of two-component and multiple-component loaded catalyst with relatively high loaded amount and containing noble metal(s) of Pt, Pd, Ru, Os, Ir, Rh, Re, etc. and other transition metal(s). By means of altering the solvent composition in dispersion system, raising the viscosity of solvent and lowering the diffusion rate of metal particles inside the solution effectively, it is possible to prevent the mutual polymerization and enlarging of metal particles without adopting macro molecule surfactant in preparing two-component and multiple-component loaded nanometer-level noble metal-based catalyst with high dispersivity and great loaded amount. Several kinds of metal may be loaded onto the carrier in once process while ensuring high metal dispersivity even in case of high metal loading amount.

The invention provides a carbon-supported multi-component catalyst and a preparation method thereof. The catalyst is prepared from a carrier and metal active components loaded on the carrier. The carrier is activated carbon. The metal active components comprise palladium, platinum and a transition metal element assistant. Based on the mass of the carrier, namely, the activated carbon, the capacity of palladium ranges from 0.5 wt% to 5.0 wt%, the capacity of platinum ranges from 0.5 wt% to 5.0 wt%, and the capacity of the transition metal element assistant ranges from 0.1 wt% to 2.5 wt%. Meanwhile, the mass ratio of palladium to platinum is 1:0.5-2.0. The catalyst can be applied to catalytic hydrogenation for synthesis of benzotriazole ultraviolet absorbent. The preparation method of the catalyst is easy and convenient, the catalytic activity is high, the selectivity and yield of target products are high, good stability is achieved, and meanwhile three wastes generated in the hydrogenation process are fewer.

The invention provides a synthesis method for zeolite-coated precious metal particles. The synthesis method comprises the steps that 1, a metal salt solution of platinum-containing soluble salt and/or palladium-containing soluble salt is taken to be mixed with a silicon source and/or an aluminum source, a template agent, a pH value regulating agent and water, gel is obtained through stirring, and dry gel is obtained through drying; 2, crystallization is performed by adopting a dry gel steam assisting method; 3, a product obtained through crystallization is calcined for 5-8 hours in an air atmosphere and then reduced for 2-4 hours in a hydrogen atmosphere. According to the method, by learning from the characteristics of synthesizing Silicate-1-coated precious metal through a steam assisting converting method, a precursor of solid superacid is introduced in the synthesizing process of mordenite and Beta zeolite, synthesis of a zeolite molecular sieve of which pore channels contain precious metal is successfully achieved, and the catalytic property of the catalyst in a light paraffin isomerization reaction is further improved.

The invention provides a high-dispersion monolithic catalyst for selectively catalytic oxidization of H2 in the atmosphere of high-concentration CO and a preparation method and application of the high-dispersion monolithic catalyst. The catalyst is suitable for a fixed bed reactor and has a multilayer structure, wherein the multilayer structure includes but not limited to a shell layer, an activecomponent layer, a carrier coating and a honeycomb carrier layer. The catalyst can be applied to the process of the selectively catalytic oxidization of H2 in the atmosphere of the high-concentrationCO, wherein the ratio of H2 to O2 in feed gas is 1:1 to 1:3, the reaction temperature is 150-250 DEG C, and the pressure is 0.3-0.6 MPa; besides, when the airspeed is 3000-20000h<-1>, the content of output H2 is less than 100 ppm, so that the reaction requirements of subsequent vapor catalytic coupling synthesis of oxalate by using CO are met.

The invention discloses a palladium metal hydrogenation catalyst used in unsaturated hydrocarbon hydrogenation. The catalyst comprises a metal active component palladium, a carrier alumina and a silica auxiliary agent. The catalyst provided by the invention has a relatively large specific surface (a specific surface area is 140-330cm<2>/g), and relatively low surface acid content (lower than 0.15mmol/g). The content of the auxiliary agent silica is 0.5-10wt%. Silica is added into the catalyst through a gas-phase silylation treatment upon alumina. Preferably, the catalyst provided by the invention also comprises a plurality of auxiliary agents. When the catalyst provided by the invention is used in an unsaturated hydrocarbon hydrogenation reaction, the catalyst has the advantages of high activity and low yield of green oil and carbon deposit.

The invention discloses a catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation. The catalyst raw material comprises surface-modified carbon nanotubes and precursor atomized particles containing an active component and auxiliary agents, the active component is Pt, the auxiliary agents are more than two of Ru, Ni, Cr, La and W, and the mass of each assistant is 0.05-1.0%of the mass of the catalyst. In addition, the invention also provides a method for preparing the catalyst. Raw materials of the catalyst comprise surface-modified carbon nanotubes and precursor atomized particles containing the active component and the auxiliary agents, the active component is Pt, and the auxiliary agents are more than two of Ru, Ni, Cr, La and W. The catalyst is applied to catalytic nitrobenzene liquid phase hydrogenation aniline synthesis reaction, and has the advantages of high initial activity, long service life, few tar byproducts, and easy industrial popularization.

An object of the present invention is to provide a treatment agent superior in harm-removing performance to metal hydride containing exhaust gas, and its production method as well as a treatment method. It is a mixture of either copper hydroxide or basic copper carbonate and silicon compound or a mixture, wherein parts of said copper compound and said silicon compound form a complex. A preparation of the treatment agent is made by a precipitation method, wherein a copper salts solution serves as a precipitation mother solution, and a mixture solution of either alkali hydroxide or alkali carbonate and alkali silicate serves as a precipitating agent. A treatment agent obtained as its result shows a high harm-removing performance to the metal hydride gas and a low heat generation, for which reason the agent is useful for treatment of the metal hydride containing exhaust gas generated in semiconductor manufacturing.

The invention discloses a nickel-based pure silicon type molecular sieve catalyst. The specific surface area of the molecular sieve catalyst is 200-500m < 2 >/g, the size of the molecular sieve catalyst is 2-5nm, and the metal loading capacity of the molecular sieve catalyst is 5-10wt%. The preparation method of the nickel-based pure silicon type molecular sieve catalyst comprises the following steps of: mixing tetraethoxysilane, ethanol, diluted hydrochloric acid and a template agent; carrying out reflux condensation; making an obtained mixture stand still; adding a polymer spinning auxiliary solution and a metal salt solution, performing uniform stirring to obtain a spinning precursor solution; and carrying out electrostatic spinning, drying and roasting to finally obtain the pure silicon type molecular sieve catalyst. According to the nickel-based pure silicon type molecular sieve catalyst prepared by the electrostatic spinning method, the specific surface area of the catalyst is large; the active metal is uniformly dispersed on the carrier, the utilization rate of the active metal is high, the dispersity of the metal is high, the particle size is small, and the active metal is not easy to sinter in a strong exothermic reaction of synthesis gas methanation.