29results about How to "Improve anti-sintering performance" patented technology

The invention discloses gold-titanium alloy nanoparticles as well as a wet chemical preparation method and application thereof. The preparation method comprises the following steps: in a water-free and oxygen-free environment, uniformly dissolving a gold salt, a titanium salt and a support carrier in an ether solvent, mixing with lithium triethylborohydride, transferring into a high-pressure reaction kettle, stirring and heating to 180-220 DEG C under the inert gas pressure of 0.5-1 MPa, and keeping the temperature for 1-4 hours; and after the mixture is cooled to the room temperature, the product solution is diluted with normal hexane, cleaning and drying are conducted, and the gold-titanium alloy nanoparticles are obtained. According to the invention, gold salt and titanium salt adsorbed on a support carrier are reduced by using a strong reducing agent under the conditions of high temperature and high pressure, and highly dispersed nanoparticles with uniform particle size are prepared; by introducing the supporting carrier, the problem that the particle size is increased due to agglomeration of alloy nanoparticles at high temperature is avoided, the catalytic performance and the anti-sintering performance of the catalyst are enhanced through strong interaction with the carrier, and the catalyst has wide application prospects in the fields of CO thermal oxidation and CO electrochemical oxidation.

The invention provides a modification method of a Pd / C catalyst. The method comprises the following steps: (1) carrying out first drying treatment on the Pd / C catalyst; (2) mixing the catalyst obtained in the step (1), S-containing amino acid or a derivative thereof, an organic nitrogen source and a solvent, and carrying out heat treatment, wherein the mass ratio of the S-containing amino acid or the derivative thereof to the organic nitrogen source to the catalyst to the solvent is (0.01-0.1): (0.05-0.5): 1: (5-50); (3) separating and washing the catalyst obtained in the step (2), and carrying out second drying treatment; and (4) roasting the catalyst obtained in the step (3) to obtain the modified Pd / C catalyst. The invention also provides a hydrodehalogenation method of halogenated organic matters. According to the method, the Pd / C modified catalyst is used for reaction.

The invention discloses a catalyst for simultaneously removing cyanide and organic matters in wastewater by a peroxymonosulfate oxidation method as well as a preparation method and application of the catalyst, and belongs to the field of chemistry and chemical engineering, in particular to the technical field of catalyst preparation. According to the preparation method, metal oxides such as molybdenum, cerium, vanadium and the like are introduced as a substrate, precise doping of cobalt and nickel and loading of noble metal nanoparticles are performed, and the structural stability and the anti-sintering capability of the catalyst are enhanced through surface modification while uniform distribution of metal elements is ensured, and efficient performance is kept for a long time under high-temperature complex reaction conditions; the catalyst prepared by the method is applied to simultaneous removal of cyanides (free cyanogens and complex cyanogens) and organic matters in wastewater by a peroxymonosulfate oxidation method, has excellent catalytic activity, can quickly reach the degradation rate of 90% or above for 100pmm cyanides (free cyanogens and complex cyanogens) and 200mg / LCOD organic matters in wastewater, and has excellent degradation effect and reaction rate.

The invention provides an anti-degradation automobile exhaust purification three-way catalyst and a preparation method thereof.The three-way catalyst comprises a carrier and a coating coated on the carrier, and the coating comprises a lower coating, a middle coating and an upper coating which are sequentially arranged on the carrier from bottom to top; the lower coating comprises a magnesium-aluminum composite oxide, a first cerium-zirconium composite oxide and precious metal Pd, the middle coating comprises a lanthanum-aluminum composite oxide, a second cerium-zirconium composite oxide and precious metal Rh, and the upper coating is a lanthanum coating formed by dipping a lanthanum salt solution. According to the catalyst disclosed by the invention, the noble metal Pd and the MgO-Al2O3 material are combined, so that the Pd is effectively anchored on the carrier more stably under a high-temperature condition, the Pd is distributed more uniformly, the ignition of the catalyst can be effectively accelerated, and meanwhile, the high-temperature stability of the catalyst is ensured; the outermost layer of the catalyst is impregnated with lanthanum salt to adjust multi-layer distribution control of La in the catalyst, and the anti-sintering performance of the catalyst is further improved.

The present invention provides a copper-based catalyst, a preparation method and an application thereof, and relates to the technical field of synthesizing indole. The copper-based catalyst is composed of a carrier, an active component and an auxiliary metal, wherein the active component accounts for 5% to 15% of the carrier mass, and the auxiliary metal accounts for 3% to 15% of the carrier mass; wherein the carrier is a silica carrier doped with zirconium silicate, and the doping amount of zirconium silicate is 0 to 20% of the silica carrier mass; the active component is copper; the auxiliary metal is a first auxiliary metal and a second auxiliary metal with a mass ratio of 2 to 10:1 to 5, the first auxiliary metal is one or more of zinc, magnesium, calcium, cobalt, and nickel, and the second auxiliary metal is one or more of yttrium, lanthanum, cerium, praseodymium, samarium, aluminum, gallium, indium, chromium, molybdenum, and tungsten. The copper-based catalyst provided in the embodiment of the present invention has excellent performance and has significant advantages in terms of sustained reaction life. When preparing indole, the copper-based catalyst can react continuously for 10 h with a yield of more than 60%, react for 200 h, and maintain a yield of more than 40%, and react for 500 h with a yield of more than 32%.

The invention provides a cracking furnace tube coating material composition, a cracking furnace tube coating and a preparation method of the cracking furnace tube coating. The coating material composition comprises a first coating material and a second coating material, the first coating material comprises the following components: a catalytic active component, a complexing agent, a buffering agent and a dispersing agent; the second coating material is liquid slurry or a solid particle mixture. The preparation method of the coating comprises the following steps: pretreating the surface of a base material; loading a first coating material on the surface of the pretreated base material, and forming a first coating after atmosphere stabilization treatment; and loading a second coating material on the surface of the first coating, and carrying out high-temperature thermal co-permeation to obtain the coating. According to the cracking furnace tube coating prepared from the coating material composition, catalytic active elements contained in the cracking furnace tube coating have high dispersity and are stable, and in the repeated use process, the migration phenomenon of the whole elements in the coating is few, and the element loss amount is low.

The invention belongs to the technical field of catalysts, and particularly relates to a composite carrier dehydrogenation catalyst for preparing gamma-butyrolactone through dehydrogenation of 1, 4-butanediol as well as a preparation method and application of the composite carrier dehydrogenation catalyst. According to the composite carrier dehydrogenation catalyst disclosed by the invention, a Y-type molecular sieve / gamma-Al2O3 is used as a composite carrier, and an active component copper oxide is loaded on the composite carrier; wherein the mass ratio of the Y-type molecular sieve to the gamma-Al2O3 is (1-2): 1, the copper element content is 10%-20% according to the weight ratio of the composite carrier, and the zinc element content is 6%-10% according to the weight ratio of the composite carrier. By adopting a composite carrier structure, the dispersity and stability of active metals Cu and Zn are effectively enhanced. The composite carrier dehydrogenation catalyst prepared by the preparation method provided by the invention has the advantages of high catalytic activity, high selectivity and high stability.

The present invention provides a SiO2 coated structural material and a preparation method and application thereof, belonging to the technical field of catalyst preparation. The SiO2 coated structural material comprises SiO2 nanospheres and metal oxide nanoclusters encapsulated inside the SiO2 nanospheres; the metal elements of the metal oxide nanoclusters comprise Cu, and at least one of Zr, Yb, Hf, Y and Zn. Compared with the existing SiO2 coating technology, the method provided by the present invention overcomes the two-step traditional process of first preparing the coating center and then encapsulating, and only uses a one-step process to achieve coating. Compared with traditional supported metal catalysts, the catalyst synthesized by this method has higher ethanol conversion rate and butene selectivity for the one-step ethanol to butene reaction, which is due to the fact that the SiO2 coated catalyst encapsulates the active sites in SiO2, inhibits the high-temperature agglomeration of the active sites, and thus improves the catalyst's sintering resistance.

The invention discloses an anti-sintering copper oxide / cerium dioxide catalyst and a preparation method thereof, soluble cerium salt is directly impregnated on metal copper salt or copper oxide based on an impregnation method, and the high-activity and anti-sintering copper oxide / cerium dioxide catalyst is obtained through drying and roasting activation. In the preparation process, a unique layered cerium dioxide nanosheet structure is formed, and copper oxide particles are constrained in a layered cerium dioxide nano gap layer through a layered spatial constraint effect; in addition, due to the interaction between the layered cerium dioxide nanosheets and the copper oxide particles and the space intervals between the layered cerium dioxide nanosheets and the copper oxide particles, the sintering phenomena of aggregation, growth and the like of the copper oxide particles and the layered cerium dioxide nanosheets at high temperature are limited; compared with a catalyst prepared by an existing impregnation method, the catalyst prepared by the invention has more excellent activity and sintering resistance, is safe and simple to operate, is low in cost and is easy to industrialize.

This invention discloses a high-temperature oxidation-resistant and corrosion-resistant coating, its preparation method, and its application. The coating comprises a NiCrAlY alloy binder layer and a YSZ ceramic layer. The NiCrAlY layer contains 19-23% Cr, 3-5% Al, 0.01-0.9% Y, with the balance being Ni. The YSZ layer is ZrO2 doped with 5-8 wt% Y2O3. The thickness of the NiCrAlY layer is 50-150 μm, and the ratio of the thickness of the YSZ layer to the thickness of the NiCrAlY layer is (1-2.5):1. By combining the properties of the NiCrAlY and YSZ layers with the spraying process, the above coating can effectively suppress metal oxidation during spraying, reduce oxide inclusions, and improve the purity and toughness of the coating. Furthermore, by considering the coating composition and structure, it can suppress the YSZ phase transformation, delay TGO growth, and improve the coating's anti-sintering properties.

The invention discloses a high temperature resistant copper-based methanol synthesis catalyst and a preparation method thereof. The specific operation of the preparation method is: firstly, a precipitant is dripped into an aluminum nitrate solution containing an auxiliary agent to obtain a pseudo-boehmite nanosheet array carrier, and then a Cu / Zn mixed salt solution and a precipitant are co-currently embedded between the nanosheet layer array carriers, and then washed, filtered, dried, calcined, and formed to obtain a high temperature resistant copper-based methanol synthesis catalyst isolated by a nano-array wall. The catalyst prepared by the method shown in the invention has the advantages of strong anti-sintering ability, good thermal stability, long service life, etc., and is suitable for preparing methanol from synthesis gas containing CO, CO2 and H2, and is particularly suitable for large-scale medium-pressure synthesis methanol devices.

The invention discloses a high-stability noble metal-based catalyst based on strong interaction of a metal carrier, a preparation method of the high-stability noble metal-based catalyst and application of the high-stability noble metal-based catalyst in preparation of methanol by catalytic hydrogenation of carbon dioxide. The preparation method comprises the following steps: mixing dispersion liquid containing a noble metal precursor and a metal oxide carrier with alkali metal salt; and adding a hydrazine hydrate solution until the mixed solution becomes taupe, evaporating the mixed solution to dryness, and roasting. According to the invention, the bridge type charge transfer effect of alkali metal elements is utilized to enhance the charge balance transfer rate between the noble metal nanoparticles and the metal oxide carrier in the supported noble metal-based catalyst; therefore, the metal oxide carrier is accelerated and induced to migrate and overflow towards the surfaces of the noble metal nanoparticles in a high-pressure reducing atmosphere, a thin-layer coating structure is formed on the surfaces of the noble metal nanoparticles, the stability and the anti-sintering performance of a noble metal active center in the high-pressure reducing atmosphere are improved, and agglomeration and inactivation of the nanoparticles are inhibited; and the conversion efficiency of CO2 can be higher than 6%, the selectivity of the product methanol is higher than 75%, and the method can stably operate for more than 100 hours.

The application discloses a mesoporous hollow sphere assembly structure catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen production by methane decomposition. The preparation method comprises the following steps: dissolving Ni salt, Al salt and Ce salt in a solvent, and controlling the molar ratio of Ni, Al and Ce to be 7:(1-2.5):(0.5-2); obtaining atomized liquid drops through atomization, and performing a decomposition reaction on the atomized liquid drops at 400-500 DEG C; collecting reaction products, drying, and then calcining by heating to 550-700 DEG C to obtain a catalyst precursor; and performing reduction treatment on the catalyst precursor in a reducing atmosphere, and the mesoporous hollow sphere assembly catalyst with a cerium-doped regulated interface is obtained. The catalyst exhibits remarkable high mass space velocity long-term stability and anti-coking performance in the methane catalytic decomposition reaction.

The invention relates to the technical field of thermal barrier coating materials, and discloses an anti-sintering pyrochlore and fluorite double-phase high-entropy rare earth zirconate thermal barrier coating material and a preparation method thereof. The chemical composition of the thermal barrier coating material is (La < 0.2 > Sm < 0.2 > Dy < 0.2 > Yb < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >, (La < 0.2 > Sm < 0.2 > Yb < 0.2 > Sc < 0.2 > Y < 0.2 >) < 2 > Zr < 2 > O < 7 >, and (La < 0.2 > Nd < 0.2 > Yb < 0.2 > Lu < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >. The preparation method comprises the following steps: S1, preparing a solution according to a molecular formula; s2, performing reverse coprecipitation on the solution obtained in the step S1 to prepare a material; and S3, pre-sintering the material obtained in the step S2, and sintering for the second time to obtain the high-entropy rare earth zirconate thermal barrier coating material. The grain size and the grain growth speed of the pyrochlore and fluorite double-phase high-entropy rare earth zirconate designed by adopting the method are obviously reduced, and the sintering resistance is better.

The present invention provides a kind of aldehyde hydrogenation Cu-based catalyst and its preparation method and application. The composition of the catalyst is Cu-M / SiO2-Al2O3, the content of active component Cu is 20-40wt%, and the content of auxiliary agent M is 1-5wt%. The catalyst preparation method includes: after the active component is mixed with a dispersant, a supported catalyst is obtained by a co-current coprecipitation method, wherein the introduction of a carrier with a large specific surface area can improve the active group dispersion, and the addition of a metal auxiliary agent can effectively promote the interaction (SMSI) of the metal carrier, which is conducive to suppressing its sintering and agglomeration during the reaction, enhancing catalytic activity, and reducing the loss of metal in liquid phase reaction. The catalyst of the present invention reduces the alcoholysis of silicon by adopting a composite carrier, protects the catalyst skeleton from being destroyed, prolongs the catalyst life, and has good performance in aldehyde hydrogenation reaction.

The invention relates to a direct methane solid oxide fuel cell anode catalyst layer material and a preparation method and application thereof, the direct methane solid oxide fuel cell anode catalyst layer material is prepared by calcining a precursor material in a reducing atmosphere, the molecular formula of the precursor material is SrTi1-xRuxO3-delta, in the formula, x is more than or equal to 0.05 and less than or equal to 0.15, and delta is oxygen vacancy content. A precursor material with a specific molecular formula is calcined in a reducing atmosphere, that is, nano metal particles are anchored on the surface of an anode perovskite oxide substrate of a solid oxide fuel cell (SOFC) through an in-situ precipitation strategy, and due to in-situ precipitation and close combination between two phases, the solid oxide fuel cell has high stability and sintering resistance, and can be applied to the field of fuel cell devices. The catalytic activity and durability of the catalytic layer material are obviously improved; the nano-particles separated out from the surface of the catalyst layer material increase active sites, stimulate the mechanism that lattice oxygen participates in methane reforming, accelerate the methane reforming rate and reduce the generation of carbon deposition.

The invention relates to a defective nano spinel material, a preparation method thereof and application of the defective nano spinel material in a high-temperature inactivation-resistant Rh three-way catalyst. The invention belongs to the field of catalysts. The problems that RhAlOx and Rh inactivation are generated at the high temperature of over 900 DEG C in a three-way catalyst and the activity is low in the low-temperature cold start process are solved. The prepared defective nano spinel carrier can replace traditional Al2O3, generation of RhAlOx is eradicated fundamentally, strong interaction can be generated between the prepared defective nano spinel carrier and loaded Rh, the migration energy barrier of the Rh center is improved, the high-temperature stability of Rh nano particles is remarkably improved, and the Rh nano particles can be applied to the field of Rh nano particles. The specific surface area of the prepared high-temperature inactivation-resistant Rh three-way catalyst is hardly changed after high-temperature treatment at 900 DEG C, the cold start performance is kept unchanged, Rh inactivation is remarkably inhibited, the service life of the catalyst is greatly prolonged, and the high-temperature inactivation-resistant Rh three-way catalyst is simple in preparation process and beneficial to industrial production.

The invention discloses a preparation method and application of a metal oxide nanotube catalyst with confinement effect, and belongs to the field of catalyst preparation. The preparation method comprises the following steps: preparing a nanotube by adopting a hydrothermal method, and respectively loading noble metal into and out of the nanotube by adopting an impregnation method; the outer diameter of the nanotube is 20 to 300 nm, the wall thickness of the nanotube is 10 to 150 nm, and the length of the nanotube is 30 to 500 nm; the catalyst is composed of an active component and a carrier, the active component is a noble metal, the carrier is a nanotube, the nanotube is one of a CeO2 nanotube, a TiO2 nanotube and the like, and the noble metal is one of Pd, Ir, Rh and Ru; the content of the active component accounts for 0.1%-10% of the total mass of the catalyst, and the carrier accounts for 90%-99.9% of the total mass of the catalyst; the obtained catalyst is used for preparing methanol through CO2 hydrogenation, and by changing the position of the active component on the carrier, and due to the confinement effect of the nanotube, the performance of the catalyst loaded with the noble metal inside the nanotube is superior to that of the catalyst loaded with the noble metal outside the nanotube.

The present invention discloses a coated catalyst for methane oxygen-free aromatization, a preparation method and application thereof, comprising a core and a shell coated on the surface of the core; wherein the core is a molecular sieve loaded with metal carbides, and the shell is an oxide. The coated catalyst of the present invention forms active metal carbides in the core through carburization treatment to improve the stability of metal species in the molecular sieve pores, and forms a coating layer on the catalyst surface. The two methods cooperate to reduce carbon deposition, achieve effective control of metal species migration and carbon deposition inhibition, and improve the stability and reaction activity of the catalyst in long-term methane oxygen-free aromatization, which is of great significance.

The invention relates to the technical field of catalysts, and discloses a high-efficiency catalyst for polyol synthesis and a preparation method thereof, the catalyst uses boron nitride with a hierarchical porous structure as a carrier, uses molybdenum and cobalt as active metal components, and performs surface modification through a specific organic ligand. The preparation method mainly comprises the following steps: carrier pretreatment, equivalent-volume impregnation loading of active components, temperature programming preliminary heat treatment, reduction activation under specific conditions, microwave-assisted surface modification and the like. The initial activity and selectivity of the catalyst are improved, it is guaranteed that the catalyst obtains high metal dispersity and excellent batch-to-batch stability, and the anti-sintering capacity and durability of the catalyst in the polyol synthesis reaction are improved.

The invention provides a catalyst for removing non-methane alkane and a preparation method of the catalyst. The catalyst for removing the non-methane alkane is prepared from the following raw materials: a Cu / MXene-Cr / Co doped g-C3N4-CeO2 composite carrier and a metal active component, through the synergistic effect of the composite carrier and the metal active component, the catalyst has excellent low-temperature catalytic activity, water resistance, sulfur resistance and cycling stability, can efficiently remove non-methane hydrocarbons in various waste gases, and has a wide application prospect.

The present invention discloses a method for preparing a low-cost, high-temperature-resistant, long-life thermal resistance coating and the prepared coating, including preparing a metal bonding layer on the surface of a high-temperature alloy substrate; using an electron beam physical vapor deposition process to prepare a ceramic inner layer with a "Z"-shaped structure on the surface of the obtained metal bonding layer; using an EB-PVD process to prepare a low infrared emissivity layer with a "Z"-shaped structure on the surface of the obtained ceramic inner layer. The coating prepared by the method of the present invention overcomes the problems of high emissivity, poor thermal cycle resistance, and high cost of the coating prepared by the above-mentioned prior art, has good stability above 1000°C, 3-5μm infrared emissivity as low as 0.3, 1000°C thermal conductivity as low as 0.8w / (m*k), and excellent thermal cycle performance and low cost.

The present application provides a kind of dehydrogenation catalyst and its preparation method and use, the dehydrogenation catalyst includes carrier Z and copper, chromium, element X and element Y supported on the carrier Z;With the total mass of dehydrogenation catalyst as benchmark, the copper content is 1-15wt%;The chromium content is 0.1-5wt%;The element X includes any one or at least two combinations of zinc, gallium, indium, tin or bismuth;Element Y includes any one or at least two combinations of magnesium, calcium, strontium or barium.The dehydrogenation catalyst of the present application uses copper as active component, chromium, element X and element Y as auxiliary, improves the selectivity of dehydrogenation catalyst to main product of dehydrocyclization, reaction by-product is less, anti-carbon, anti-sintering;And with low chromium and low copper design to reach moderate dehydrogenation activity, avoid reaction too concentrated and cold point too low, can be used for diol efficient dehydrogenation reaction, has large-scale popularization prospect.

The invention discloses a nickel-titanium lamellar mesoporous catalyst derived from attapulgite and its preparation method and application, and the preparation method comprises the following steps: S1, attapulgite is dispersed in a hydrochloric acid solution, and hydrothermal treatment is performed to obtain a attapulgite-based silicon source; S2, the attapulgite-based silicon source and the titanium source are reacted to obtain a reaction mixture containing a Si-O-Ti polymer; S3, a template is added to the reaction mixture, and hydrothermal crystallization is performed to obtain a lamellar mesoporous zeolite carrier derived from attapulgite; S4, nickel is loaded on a carrier by an impregnation method to obtain a nickel-titanium lamellar mesoporous catalyst derived from attapulgite. The catalyst of the present invention is applied to catalyze the steam reforming of biomass tar and its model to prepare hydrogen-rich gas, and a conversion rate greater than 95% can be achieved, a hydrogen yield greater than 65% in synthesis gas, a hydrogen selectivity greater than 70%, and a high activity is still maintained for 30 hours of reaction, with the advantages of green environmental protection, high stability and low price.

The invention relates to the technical field of high-temperature protective coatings, and in particular to a novel composite rare earth silicate-rare earth zirconate gradient structure ultra-high temperature thermal / environmental barrier coating and a preparation method thereof, comprising a Si bonding layer, a RE2Si2O7 intermediate layer, a RE2SiO5-RE2Si2O7 composite rare earth silicate transition layer, and a rare earth zirconate thermal insulation top layer, which are sequentially prepared on a ceramic-based composite material substrate. In the ultra-high temperature thermal / environmental barrier coating system, the molar fraction of the RE2Si2O7 phase in the RE2Si2O7 intermediate layer is not less than 97%, which solves the problem of SiO2 volatilization in the process of plasma spraying RE2Si2O7, increases the thermal expansion matching of the Si bonding layer and the RE2Si2O7 intermediate layer, and the RE2SiO5-RE2Si2O7 transition layer has good sintering resistance and high temperature phase stability at 1400-1500°C, and also has high fracture toughness.

The present invention relates to a silicon carbide-supported nickel-based catalyst for methane carbon dioxide reforming and a preparation method. The preparation method of the silicon carbide-supported nickel-based catalyst for methane carbon dioxide reforming comprises the following steps: dissolving polycarbosilane and divinylbenzene in an organic solvent for reaction one, adding nickel acetylacetonate for reaction two after reaction one, and obtaining sample one; subjecting sample one to a hydrothermal reaction to obtain sample two; and drying, pyrolyzing, sintering, and calcining sample two under the protection of an inert gas. The preparation method of the silicon carbide-supported nickel-based catalyst for methane carbon dioxide reforming of the present invention uses nickel acetylacetonate to produce a cross-linking reaction with polycarbosilane, and before the polycarbosilane is cracked into silicon carbide, the nickel element is uniformly dispersed in the bulk phase, and due to the promotion effect of nickel on the crystallization of silicon carbide, after calcination under an inert gas atmosphere, an obvious 3C-SiC phase is formed.

The application discloses a preparation method of carbon sphere loaded small-size platinum group metal nanoparticles. The method comprises the following steps: adding a dopamine hydrochloride solution into a mixed solution of ethanol, water and ammonia water, stirring and reacting to prepare polydopamine microspheres, adding a ruthenium ion salt and a platinum group metal ion salt, stirring to enable the polydopamine microspheres to fully adsorb the ruthenium ion and the platinum group metal ion, and finally calcining the polydopamine microspheres with the adsorbed metal ions in an inert atmosphere at high temperature to prepare the carbon sphere loaded small-size platinum group metal nanoparticles. The carbon sphere loaded platinum group metal nanoparticles prepared by the method have small size, uniform distribution and an average particle size of 2-3 nm. The method is simple, suitable for preparation of various small-size platinum group metal nanoparticle materials and easy for large-scale production.

The embodiment of the invention provides a hydrogenation catalyst and a preparation method thereof, and the preparation method comprises the following steps: attaching a metal element to a catalyst carrier, and oxidizing the metal element on the catalyst carrier to obtain a catalyst precursor; and putting the catalyst precursor into a reactor at the temperature of 60-200 DEG C, and reducing for 2-48 hours under the conditions that the pressure is 0.5-5 MPa, the hydrogen flow is 100-600 ml / min and the water inlet amount of water vapor is 0.01-0.1 ml / min to obtain the hydrogenation catalyst. According to the invention, the catalyst precursor is reduced in the reactor and etched at the same time by using the water vapor etching method, and the proper amount of water vapor treatment can promote diffusion of metal elements on the surface of the catalyst, so that the aperture of the surface of the catalyst is increased, the surface of the catalyst carrier is effectively activated, and the selectivity is improved.

The invention discloses a method for preparing 2-aminomethylcyclopentylamine, wherein a continuous fixed bed process is adopted, 1-amino-2-cyanocyclopentene is used as a raw material, and 2-aminomethylcyclopentylamine is obtained by reacting under a hydrogenation catalyst with YSiO3 as a carrier and Ag2O, V5O2 and Gd2O3 as active components. The combination of the hydrogenation catalyst prepared by the invention and a special activation method maximizes the catalytic performance of the hydrogenation catalyst, the raw material conversion rate is as high as 100%, the product selectivity is as high as more than 99%, the catalyst is continuously operated for more than 2000 hours, and has the advantages of high activity, high selectivity and good stability, and has a good industrialization prospect.