67results about How to "Efficient catalytic conversion" patented technology

The invention discloses a supported nanocatalyst for catalytic conversion of carbon dioxide. The supported nanocatalyst comprises active component Cu particles, carrier silica gel and an optional auxiliary agent, wherein based on the weight of a carrier, the percentage content of the active component Cu particles is 1-40%, and the percentage content of the auxiliary agent is less than or equal to 20%; the average size of the active component Cu particles is 1-20nm, and the active specific surface areas of the active component Cu particles are 100-400m<2>.g<-1>. The invention further discloses a preparation method of the supported nanocatalyst and application of the supported nanocatalyst for catalytic conversion of carbon dioxide in the synthesis of methanol by virtue of a carbon dioxide hydrogenation reaction and the carbon monoxide reaction.

The invention discloses a nicotinamide mononucleotide adenylyl transferase gene. The nucleotide sequence of the gene is shown as SEQ ID NO: 1. The amino acid sequence of the gene is shown as SEQ ID NO:2. The invention also discloses an expression vector; a method comprises the steps of using the expression vector for transforming the host cell, culturing a transformant, and acquiring nicotinamide mononucleotide adenylyl transferase gene from culture, so as to obtain the recombinant nicotinamide mononucleotide adenylyl transferase gene. The invention discloses application of the recombinant nicotinamide mononucleotide adenylyl transferase gene to in vitro conversion of nicotinamide mononucleoside NMN into nicotinamide adenine dinucleotide NAD<+>. The invention also discloses a synthesis method of nicotinamide adenine dinucleotide NAD<+>. The method uses nicotinamide mononucleoside NMN as raw material to generate nicotinamide adenine dinucleotide NAD<+> under the action of the recombinant nicotinamide mononucleotide adenylyl transferase gene.

Viologen-based ion type porous organic polymers and a preparation method and application thereof are disclosed. The viologen-based ion type porous organic polymers have a structural formula represented by a formula shown in the specification, and are prepared by quaternization reaction of 4,4'-bipyridine respectively with 4,4'-bis(chloromethyl)-1,1'-biphenyl and 4,4'-bis(bromomethyl)-1,1'-biphenyl. Since a nitrogen cation and a halogen anion are introduced into the polymer in situ, the prepared viologen-based porous organic polymer has excellent catalytic activity, and can realize efficient catalytic conversion of carbon dioxide under mild conditions. The viologen-based porous organic polymer in the invention has excellent catalytic performance in a cycloaddition reaction of an epoxy compound and CO2 under the condition of no solvent and no cocatalyst, and the reaction also has the characteristics that the catalyst is small in usage amount, and easy to separate and recycle.

The invention discloses a preparation method of grape special purpose seaweed fertilizer. The preparation method utilizes sodium alginate production enterprise by-product kelp slag as a raw material, builds a raw material pretreatment method and develops a bio-refining technology for two-step catalytic conversion of kelp slag based on an enzyme. Through the establishment of substrate and enzyme feeding strategy, substrate inhibition is reduced, high concentration substrate system enzyme efficient catalytic conversion is realized, high concentration seaweed fertilizer is prepared, recycling use of kelp processing wastes and protection of the environment are realized, a kelp industry chain is extended and the kelp processing technology and seaweed fertilizer production level are improved. The preparation method innovates a seaweed fertilizer preparation mode, utilizes kelp production enterprise by-products as raw materials, realizes waste recycling, improves seaweed resource utilization efficiency, protects the environment, reduces a seaweed fertilizer production cost, improves a yield of grapes after application, has strong practicability and can be easily industrialized. The seaweed fertilizer is a pure natural product, does not product pollution, can be degraded, satisfies industrial demands and is environmentally friendly.

The invention provides a composite catalyst for nitric oxide purification and application of the composite catalyst. The composite catalyst for nitric oxide purification, which is provided by the invention, comprises a low-temperature catalyst and a medium / high-temperature catalyst, wherein the active temperature of the low-temperature catalyst is within 100-250 DEG C; the active temperature of the medium / high-temperature catalyst is within 200-500 DEG C; the volume ratio of the low-temperature catalyst to the medium / high-temperature catalyst is (1:5)-(5:1). As advantages of the low-temperature catalyst and the medium / high-temperature catalyst with excellent properties are combined, the composite catalyst has a wide temperature range, excellent low-temperature activity and N2 generation selectivity, and is high in NOx conversion rate and applicable to diesel engine tail gas NOx control and fixed source fume denitration.

The invention discloses a green synthesis route of furfuryl alcohol. The synthesis route is characterized in that a selective hydrogenation reaction of furfural is carried out in an aqueous solvent at room temperature under the catalysis of a porous nanometer silicon carbide supported platinum catalyst to highly-selectively synthesize furfuryl alcohol. The porous nanometer silicon carbide supported platinum catalyst has a large specific surface area and a large pore volume, and has a cauliflower-like morphology structure, and uniform distribution and high dispersiveness of platinum particles are in favor of activating the active site of the catalyst and a reaction substrate, so when the catalyst is used in the selective hydrogenation reaction of furfural under mild reaction conditions (room temperature and aqueous solvent), the activity of the catalyst is high, and the furfuryl alcohol selectivity is high. The invention also discloses a preparation method of the porous nanometer silicon carbide supported platinum catalyst. The preparation method comprises the following steps: carrying out ultrasonic dipping on SiC adopted as a carrier and chloroplatinic acid hexahydrate as an active component precursor, drying the obtained material, and reducing the dried material at 500 DEG C in highly pure hydrogen with the purity of 99.999% to prepare the catalyst.

The invention discloses a polyionic liquid catalyst, an amino ionic liquid 1-vinyl-3-ethylamino imidazole bromate and a quaternary ammonium ionic liquid vinyl benzyl triethyl ammonium chloride are taken as the active components, divinyl benzene is taken as a skeleton, free radical polymerization is used to prepare and obtain a polyionic liquid material, the excellent synergistic effect between theamino ionic liquid and the quaternary ammonium ionic liquid is used, the catalytic conversion of CO2 is efficiently conducted without solvents or additional cocatalysts at the normal pressure to prepare cyclic carbonate, the stability of the catalyst is good, and the catalyst can be recycled.

The invention provides a preparation method of olefin and a method for synthesizing Chondriamide A and Chondriamide C. The preparation method of olefin comprises the steps as follows: a compound withthe structure shown in a formula (I), a palladium catalyst, a phosphorus ligand, alkali and an organic solvent are mixed and react at the normal temperature under light, and olefin with the structureshown in a formula (II) is obtained. Through selection of the specific phosphorus ligand, the method can realize efficient catalytic conversion at the room temperature under the action of photocatalysis, has mild reaction conditions, is simple to operate, meets the requirement for developing green and environment-friendly chemistry, and has more universal substrate selection range and functional group compatibility and excellent chemical selectivity. The method can be successfully applied to a scheme for introducing C-C double bonds in complex molecules and a synthesis strategy for optimizingpart of drug molecules, can improve the synthesis efficiency and reduce the cost and has industrial synthesis value and prospects.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly discloses a nickel nitride@nitrogen-doped porous carbon sphere material. The nickel nitride@nitrogen-doped porous carbon sphere material is a porous carbon sphere which comprises a plurality of template etching holes and is of a through hole structure; the carbon skeleton of the porous carbon sphere is nitrogen-doped disordered carbon; active particles are distributed in the skeleton in an in-situ dispersion manner; the active particles are nickel nitride particles coated with in-situ graphitized carbonon the surfaces. The invention further provides a preparation method of the material and application of the material in a lithium-sulfur battery. The carbon material is uniform in granularity, the active substance sulfur can be efficiently stored due to the rich through macroporous structure, rich reaction interfaces and lithium ion transmission channels are provided, and efficient electronic conductivity can be provided through local graphitization. In addition, the polarity of the carbon substrate can be improved through the nitrogen-doped porous carbon spheres, and the nitrogen-doped porouscarbon spheres have strong adsorption conversion capacity on polysulfide in cooperation with high-dispersion nickel nitride particles.

The invention relates to a graphitized carbon foam supported carbon material / molybdenum carbide composite material, and a preparation method and an application thereof. The composite material comprises a graphitized carbon foam skeleton and a carbon material / molybdenum carbide nanodot compound attached onto the graphitized carbon foam skeleton, and molybdenum carbide nanodots in the compound growon a carbon material in situ. The composite material is prepared by adopting a method of combining dipping with heat treatment, the molybdenum carbide nanodots are uniformly distributed on the carbonmaterial, rich active sites are provided, and the method is mild in condition, low in cost and good in dispersity. The invention further provides a graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, efficient adsorption and catalytic conversion of polysulfide are realized, and the shuttle effect of the polysulfide is effectively eliminated. The graphitized carbon foam supported carbon material / molybdenum carbide composite material provided by the invention has a wide application prospect in the aspect of novel high-capacity lithium-sulfur batteries, and can be further applied to the field of other related electronic devices.

The invention discloses a low-temperature methanation catalyst and a preparation method thereof. The low-temperature methanation catalyst comprises an active component, a surfactant, a structural auxiliary agent and a cocatalyst, wherein the active component is Ni; the structure auxiliary agent is a composite structure auxiliary agent composed of Al2O3 and diatomite; the cocatalyst is one or two of La2O3, MgO, CuO and MnO; the content of the active component accounts for 50%-75% of the total mass of the low-temperature methanation catalyst, and the content of the cocatalyst accounts for 0.4%-0.8% of the total mass of the low-temperature methanation catalyst. The method is lower in reaction temperature, lower in energy consumption and simple to operate, has high catalytic activity and longservice life in a low-temperature environment, and can realize efficient catalytic conversion of CO and CO2.

The invention discloses a sorbitol dehydrogenase gene from pseudomonas syringae and application of the sorbitol dehydrogenase gene. The gene nucleic acid sequenc is shown as SEQ ID NO:1, a recombinant vector is built, cloning and expression are conducted in escherichia coli, and the sorbitol dehydrogenase amino acid sequence of the gene coding is shown as SEQ ID NO:2. The sorbitol dehydrogenase can effectively catalyze conversion of various important polyhydric alcohols and ketose corresponding to the polyhydric alcohols, the conversion rate to substrate of the sorbitol dehydrogenase is larger than 99%, compared with a traditional production method depending on isomerase, the later-period separation and decoloration costs are greatly lowered, and the sorbitol dehydrogenase gene has important industrial application value.

The invention discloses a preparation method of a high-entropy metal oxide for preparing synthesis gas by carbonate pyrolysis carbon dioxide and methane dry reforming. The high-entropy composite metal oxide is obtained by nucleation of a mixed salt solution and an alkali source solution in a nucleation reactor, crystallization, washing, drying, grinding and high-temperature roasting. The high-entropy composite metal oxide prepared by the method is used for ultrahigh-temperature coupling reaction for preparing synthesis gas by taking carbonate pyrolysis industrial tail gas CO2 and CH4 as raw materials, the synthesis gas is efficiently prepared, and meanwhile, full utilization of waste heat in the carbonate pyrolysis process and resource conversion of CO2 are realized; the contribution is made for promoting the development of environment-friendly society and circular economy; the high-entropy composite metal oxide catalyst has excellent activity, selectivity and stability.

The invention belongs to the technical field of catalysts, and particularly relates to flaky manganese dioxide as well as a preparation method and application thereof. The invention provides flaky manganese dioxide. The crystal structure of the flaky manganese dioxide is a beta phase. In the present invention, the crystal form structure of the flaky manganese dioxide is a beta phase. Test resultsshow that the flaky manganese dioxide is used for simulating purification treatment of automobile tail gas, shows good catalytic performance as a catalyst for automobile tail gas purification and hasefficient catalytic conversion on NO at 150-400 DEG C. The flaky manganese dioxide has good denitration activity at a low-temperature section and a medium-high-temperature section.

The invention belongs to the technical field of new energy, and particularly discloses a catalyst for catalyzing conversion of glucose into 5-hydroxymethylfurfural and a preparation method of the catalyst. The method is used for solving the problem of low HMF selectivity in the process of converting glucose into HMF. The preparation method comprises the following steps: firstly, synthesizing hollow mesoporous silicon spheres in the presence of absolute ethyl alcohol by taking hexadecyl trimethyl ammonium bromide as a structure-directing agent, ammonia water for providing an alkaline environment and tetraethyl orthosilicate as a silicon source of silicon dioxide; then, filling sucrose serving as a carbon source into the hollow meso-porous silicon spheres, and carbonizing and removing silicon to obtain meso-porous carbon microspheres; and finally, dipping the mesoporous carbon microspheres in a tin tetrachloride pentahydrate solution to prepare the tin-loaded mesoporous carbon microsphere catalyst. The catalyst has a large specific surface area, an excellent pore structure and good hydrothermal stability, has two acidic sites of Lewis acid and # imgabs0 # acid at the same time, and can efficiently catalyze conversion of glucose into HMF.

A catalyst for preparing dimethyl carbonate from epoxide, methanol and carbon dioxide comprises 0.005-20 wt% of a metal oxide, and the balance of an HZSM-5 molecular sieve. The catalyst is directly used in a one-pot reaction of CO2, methanol and epoxide to prepare dimethyl carbonate, and has the advantages of simple reaction steps, low cost and broad application prospect.

The invention discloses an iron-based catalyst for preparing ethanol by CO2 hydrogenation, and a preparation method and application thereof. The active sites of the iron-based catalyst for preparing ethanol by CO2 hydrogenation comprise Fe5C2, Fe2C and Fe3C, and the mass ratio of Fe5C2 to Fe2C to Fe3C is (20-36): (7-12): (4-6). The invention also discloses the preparation method and application ofthe catalyst. In the process of preparing ethanol by CO2 hydrogenation, the catalyst has ethanol selectivity of more than or equal to 20% and CO selectivity of less than or equal to 10%; according tothe catalyst prepared by the preparation method of the iron-based catalyst for preparing ethanol by CO2 hydrogenation, the efficient synergistic effect of the auxiliary agent and the active metal iron oxide is realized; and the auxiliary agent effectively changes the reducibility of active metal iron oxide, efficiently regulates and controls the variety and proportion of the active metal iron-carbon compound of the catalyst, and further enhances the catalytic reactivity of the catalyst.

The invention discloses a nicotinamide ribose phosphate transferase mutant and application thereof. In the first aspect of the application, the nicotinamide ribose phosphate transferase mutant is provided, the nicotinamide ribose phosphate transferase mutant comprises an amino acid sequence obtained after an amino acid sequence shown as SEQ ID No.1 is mutated, and mutation comprises at least one of the facts that valine at the position 202 is mutated into alanine and leucine at the position 364 is mutated into proline. According to the embodiment of the invention, the nicotinamide ribose phosphate transferase at least has the following beneficial effects: compared with the existing nicotinamide ribose phosphate transferase, the nicotinamide ribose phosphate transferase provided by the embodiment of the invention has higher enzyme activity than the conventional wild type nicotinamide ribose phosphate transferase, and the substrate containing nicotinamide and 5-phosphoribose-1-pyrophosphoric acid can be efficiently catalytically converted into NMN.

The invention discloses a sorbitol dehydrogenase gene from pseudomonas syringae and application of the sorbitol dehydrogenase gene. The gene nucleic acid sequenc is shown as SEQ ID NO:1, a recombinant vector is built, cloning and expression are conducted in escherichia coli, and the sorbitol dehydrogenase amino acid sequence of the gene coding is shown as SEQ ID NO:2. The sorbitol dehydrogenase can effectively catalyze conversion of various important polyhydric alcohols and ketose corresponding to the polyhydric alcohols, the conversion rate to substrate of the sorbitol dehydrogenase is larger than 99%, compared with a traditional production method depending on isomerase, the later-period separation and decoloration costs are greatly lowered, and the sorbitol dehydrogenase gene has important industrial application value.

The invention relates to the technical field of preparation of high-added-value chemicals through chemical catalysis of catalysts, in particular to a preparation method, a product and application of a bimetallic MOF catalyst. The preparation method comprises the following steps: uniformly mixing zircon salt, tin salt, an organic ligand and an organic solvent to obtain a mixed solution; and heating the mixed solution for reaction to obtain a reaction solution, washing, carrying out solid-liquid separation, and drying the obtained solid to obtain the bimetallic MOF catalyst. The method is easy to operate and low in cost, is close to conditions of large-scale production and application, and has important practical value. The bimetallic MOF catalyst prepared by using the method disclosed by the invention enhances the Lewis acidity of the catalyst, effectively promotes isomerization conversion from xylose to xylulose and reverse aldol condensation from xylulose to a C3 intermediate product in a cascade reaction process, and improves the selectivity of a main reaction path for preparing lactic acid from biomass; and efficient catalytic conversion from biomass to lactic acid is realized.

The invention relates to the field of dihydric alcohol production, in particular to a catalyst suitable for high-yield production of 1, 5-pentanediol, a preparation method of the catalyst and a production method of 1, 5-pentanediol. Under the catalytic action of a nickel-based catalyst with a composite carrier, tetrahydrofurfuryl alcohol is subjected to one-step hydrogenation ring opening to generate 1, 5-pentanediol. According to the method, tetrahydrofurfuryl alcohol is adopted as a raw material and is converted into 1, 5-pentanediol on a hydrogenation-ring-opening bifunctional catalyst in a hydrogenation manner, and byproducts such as 1, 2-pentanediol, 2-methyltetrahydrofuran and n-pentanol are obtained. The composition of the hydrogenation-ring opening bifunctional catalyst is NiO-CoO / La2O3-ZrO2, the hydrogenation component is CuO-CoO and a composite oxide carrier La2O3-ZrO2, and the pressure conditions of the hydro-conversion process are as follows: the H2 pressure is 3.0-4.0 MPa, and the temperature is 165-195 DEG C. The invention also discloses a preparation method of the hydrogenation-ring opening bifunctional catalyst.

The invention relates to a difunctional rod-shaped CeO2amp; the preparation method of the ZSM-5 composite catalyst specifically comprises the following steps: weighing cerium nitrate hexahydrate and sodium hydroxide, dissolving the cerium nitrate hexahydrate and the sodium hydroxide in deionized water to obtain a light blue solution, and standing; after standing, adding acidic ZSM-5 while stirring to form a white turbid solution, and reacting for a period of time; after the reaction is finished, transferring the white turbid solution into a reaction kettle, carrying out hydrothermal reaction to obtain a blue precipitate, washing the blue precipitate with deionized water and absolute ethyl alcohol respectively, and drying to obtain a rod-like precursor; carrying out high-temperature calcination on the precursor in an air atmosphere to obtain difunctional rod-like CeO2amp with uniform oxygen vacancies and acidity; the invention discloses a ZSM-5 composite catalyst. The catalyst is applied to catalytic conversion of lignin oil and oligomers thereof. The method is simple in preparation process, low in cost, stable in structure and high in active center dispersity, overcomes weak interaction between carriers, and has an efficient catalytic conversion effect on lignin oil and derived oligomers thereof.

The invention discloses a catalyst for preparing higher alcohols from synthesis gas and a preparation method of the catalyst, and belongs to the technical field of catalysts. The preparation method ofthe catalyst provided by the invention comprises the following steps: (1) preparing an iron-based catalyst filter cake; (2) adjusting the solid content of the iron-based catalyst filter cake, addingmelamine, and pulping to obtain slurry; (3) subjecting the slurry to spray drying and roasting so as to obtain an iron-based catalyst precursor containing g-C3N4; and (4) carrying out reduction and nitridation treatment on the iron-based catalyst precursor containing g-C3N4 to obtain the catalyst. The active phase of the catalyst is iron nitride, the structure of the active phase is relatively single and easy to control, and the iron nitride has the characteristics of CO molecular adsorption and dissociated adsorption at the same time, and synthesis gas can be efficiently catalyzed and converted into higher alcohols.

The invention discloses a supported nanocatalyst for catalytic conversion of carbon dioxide. The supported nanocatalyst comprises active component Cu particles, carrier silica gel and an optional auxiliary agent, wherein based on the weight of a carrier, the percentage content of the active component Cu particles is 1-40%, and the percentage content of the auxiliary agent is less than or equal to 20%; the average size of the active component Cu particles is 1-20nm, and the active specific surface areas of the active component Cu particles are 100-400m<2>.g<-1>. The invention further discloses a preparation method of the supported nanocatalyst and application of the supported nanocatalyst for catalytic conversion of carbon dioxide in the synthesis of methanol by virtue of a carbon dioxide hydrogenation reaction and the carbon monoxide reaction.

The present application discloses a mutant of nicotinamide phosphoribosyltransferase and its application. The first aspect of the present application provides a mutant of nicotinamide phosphoribosyltransferase, the mutant of nicotinamide phosphoribosyltransferase includes the mutated amino acid sequence of the amino acid sequence shown in SEQ ID No.1, and the mutation includes position 202 Valine is mutated to alanine, and the 364th leucine is mutated to proline at least one. The nicotinamide phosphoribosyltransferase according to the embodiment of the present application has at least the following beneficial effects: Compared with the existing nicotinamide phosphoribosyltransferase, the nicotinamide phosphoribosyltransferase provided in the embodiment of the present application is compared with the conventional wild-type The nicotinamide phosphoribosyltransferase has higher enzymatic activity and can efficiently catalyze the conversion of substrates containing nicotinamide and 5-phosphoribosyl-1-pyrophosphate into NMN.

The invention provides a preparation method of olefin and a method for synthesizing Chondriamide A and Chondriamide C. The preparation method of olefin comprises the steps as follows: a compound withthe structure shown in a formula (I), a palladium catalyst, a phosphorus ligand, alkali and an organic solvent are mixed and react at the normal temperature under light, and olefin with the structureshown in a formula (II) is obtained. Through selection of the specific phosphorus ligand, the method can realize efficient catalytic conversion at the room temperature under the action of photocatalysis, has mild reaction conditions, is simple to operate, meets the requirement for developing green and environment-friendly chemistry, and has more universal substrate selection range and functional group compatibility and excellent chemical selectivity. The method can be successfully applied to a scheme for introducing C-C double bonds in complex molecules and a synthesis strategy for optimizingpart of drug molecules, can improve the synthesis efficiency and reduce the cost and has industrial synthesis value and prospects.

The invention provides a composite catalyst for nitric oxide purification and application of the composite catalyst. The composite catalyst for nitric oxide purification, which is provided by the invention, comprises a low-temperature catalyst and a medium / high-temperature catalyst, wherein the active temperature of the low-temperature catalyst is within 100-250 DEG C; the active temperature of the medium / high-temperature catalyst is within 200-500 DEG C; the volume ratio of the low-temperature catalyst to the medium / high-temperature catalyst is (1:5)-(5:1). As advantages of the low-temperature catalyst and the medium / high-temperature catalyst with excellent properties are combined, the composite catalyst has a wide temperature range, excellent low-temperature activity and N2 generation selectivity, and is high in NOx conversion rate and applicable to diesel engine tail gas NOx control and fixed source fume denitration.

The invention provides a self-supporting electrode and a preparation method thereof and a lithium-sulfur battery, and the preparation method of the self-supporting electrode comprises the following steps: loading a microwave absorbent containing transition metal and a conductive modifier on the surface of biomass; placing the treated biomass material in a magnetic field and a microwave field, and carrying out hydrothermal reaction to obtain a matrix electrode; and carrying out sulfur loading treatment on the obtained matrix electrode to obtain the self-supporting electrode. According to the preparation method, the self-supporting electrode is prepared by adopting uniform magnetic field induction to assist one-step microwave hydrothermal, and compared with preparation of other electrode materials, the prepared electrode material has the advantages that addition of a binder, a conductive agent and the like is avoided, and the method is simple, convenient, efficient, mild in condition, low in cost, energy-saving, environment-friendly, high in independence and capable of being produced in batches. Compared with a coated electrode, the surface loading capacity of sulfur of the electrode material is greatly improved.

The invention discloses a precise metal cluster-based composite catalyst as well as preparation and application thereof. According to the precise metal cluster-based composite catalyst, a metal nanocluster of metal gold, silver, palladium, platinum or alloys thereof is used as an active center and is compounded with a carrier with ion exchange capacity to form the catalyst. The catalyst disclosed by the invention has excellent catalytic performance when being applied to catalysis of carbon-carbon coupling reactions such as carbon dioxide reduction coupling and Suzuki cross coupling reactions. The material has a plurality of advantages and has a certain industrial application prospect. The catalyst in the method is low in metal content, high in efficiency, low in cost and small in environmental pollution.

The present invention provides a Ni-M single-atom alloy catalyst and a preparation method and application thereof. The catalyst is a magnesium-aluminum metal mixed oxide MgAlO X As a carrier, a first metal Ni and a second metal M are loaded, wherein the second metal M is selected from one of the noble metals Pt, Ru, Pd, Rh, Ir, Ag and Au, or one of the non-noble metals Fe, Co, Cu, Zn, Ga, In, Mn, Bi, Cd, Sn. By configuring a mixed metal salt solution of Ni, M, Mg, and Al, a Ni / M / Mg / Al quaternary layered hydroxide material Q is prepared by a coprecipitation method, and then a supported Ni-M single-atom alloy catalyst is obtained by thermal reduction. The catalyst is used in the reaction of selective hydrogenation of 2,6-diamino-3,5-dinitropyridine to prepare 2,3,5,6-tetraaminopyridine, and shows high activity and high selectivity under mild conditions, avoiding the occurrence of side reactions such as excessive hydrogenation under high temperature conditions; it also has the characteristics of good stability, reusability and long life, and has broad prospects in industrial applications.