296 results about "Platinum salts" patented technology

The invention discloses a dehydrogenation catalyst for feed gas containing carbon monoxide, a preparation method and an application method thereof. The catalyst takes alumina as a carrier, palladium and / or platinum as an active component and 2 to 4 MOxes as an additive, M is sodium, potassium, magnesium, titanium, zirconium, vanadium, manganese, iron, nickel, cobalt, copper, molybdenum, tungsten or cerium, and components of the catalyst (calculated by carrier mass) are: 0.01 to 2 percent of the palladium and / or 0.01 to 1 percent of the platinum, and 1 to 2 percent of MOxes. The preparation method for the catalyst comprises the following steps that: firstly, an additive metal salt solution is used to impregnate the carrier; a palladium and / or platinum salt solution is used to impregnate the carrier after the carrier is dried and roasted; and the impregnated carrier is roasted at a temperature of between 450 and 850 DEG C to obtain the catalyst. Before the use, H2-N2 mixed gas containing more than 10 percent of hydrogen or pure hydrogen is activated by the catalyst at a temperature of between 450 and 650 DEG C. The catalyst can perform deep removal on less than 5 percent of hydrogen in the feed gas with the CO content of between 10 and 99 percent, the using temperature is between 100 and 300 DEG C, the space velocity is between 500 and 9,000h<-1>, the dehydrogenation rate is more than 99 percent, the content of outlet hydrogen is less than 100 ppm, and the loss of the carbon monoxide is less than 0.5 percent.

A PtNi alloy / graphene combined nanometer catalyst with a hollow structure adopts the graphene as a carrier and loads the PtNi alloy nanometer particles of which the grain diameter is 10-50 nm on the surface of the graphene, wherein the PtNi alloy nanometer particles are hollow spherical structures. The method for preparing the combined catalyst comprises the following steps: dispersing the graphene oxide in water liquor to which surfactant is added through ultrasound; uniformly mixing with soluble nickel salt (II); adding the reducing agent in inert gas atmosphere; adding soluble platinum salt (IV); stirring at 0-50 DEG C to execute the reduction reaction; centrifuging, washing and drying the reaction product to obtain the PtNi alloy / graphene combined nanometer catalyst with the hollow structure. The PtNi alloy / graphene combined nanometer catalyst with the hollow structure in the invention has good electro-catalytic property on electrochemical oxidation of methyl alcohol, and can be widely applied in methyl alcohol fuel cells.

The invention relates to a preparation method of a nanometer Pd or the Pd platinum gold electrocatalysis catalyzer which is used in a kind of fuel cell, whose characteristic lies in that dissolve the mixture of the ration Pd salt or the Pd salt and the platinum salt (in which the Pd atomic ratio accounts for metal quantity 10-100%) in the water, after joining the right amount complexing agent solution, elevates temperature to 0-80deg.C and keeps the temperature 5 minutes to 8 hours, then cooling to the room temperature, adjusts the pH value to 5 to 12 and adds the carbon carrier, then adds the solution of hydroboration sodium, hydrazine or formic acid and so on reducing agent under the 0 to 80deg.C , and maintains 10 minutes to 10 hours, then filtrating, laundering, dry, finally in inert atmosphere or reducing atmosphere through 100 to 300deg.C heat treatment in 0.5 to 10h, namely carries the carbon Pd or the Pd platinum electrocatalysis. The particle size of catalyst is controllable, adjustable, the composition is controllable, regards the heat treatment temperature to be different, the particle size which obtains is relatively 1.8nm to 20nm above, and the granule distribution is narrow, is suitable to serve as the direct formic acid fuel cell anode catalyst as well as the direct methanol fuel cell anti-methyl alcohol negative pole catalyst.

The invention relates to a hollow porous spherical platinum-silver alloy nano-material and a preparation method for the same. The nano-material is of a spherical structure with a porous shell and an internal cavity, the diameter of the spherical structure ranges from 5 nanometers to 500 nanometers, the inner diameter of the cavity ranges from 1 nanometer to 400 nanometers, the thickness of a porewall ranges from 1 nanometer to 50 nanometers, and the pore diameter ranges from 1 nanometer to 20 nanometers. Polyatomic alcohol, inorganic silver salt precursor, inorganic platinum salt precursor and polyvinylpyrrolidone are used as reaction raw materials, inorganic salt containing halogen ions and copper-containing inorganic salt are used as auxiliaries, and the hollow porous spherical platinum-silver alloy nano-material is synthesized by means of reaction. The preparation method is simple in process, convenient in operation, fine in repeatability and low in cost, and the obtained hollow porous spherical platinum-silver alloy nano-material can be used for the fields of chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, information storage, fuel cells, solarcells and the like. Particularly, the hollow porous structure of the nano-material can be effectively applied to slow drug release and target-oriented drug delivery treatment.

The invention provides a method for preparing a core-shell structure gas porous electrode catalyst, which belongs to the field of fuel cells. First, a homogeneously dispersed non-platinum-group transition metal M core is optionally deposited on a gas porous electrode which is bonded on perfluoro sulfonic acid resin, and then a M@Pt core-shell type catalyst is made through a chemical replacement reaction between the deposited non-platinum-group transition metal M core and a platinum salt solution. The invention has the advantages of simple process and low cost. The M@Pt core-shell type catalyst which is prepared by the invention is capable of effectively reducing the amount of precious metal platinum, improving the utilization ratio of the catalyst, and the catalyst is capable of replacing a prior commercial Pt / C catalyst.

The invention relates to a carbon tungsten catalyst and relative production, wherein said catalyst is powder particles with hollow structure. The production comprises that: dissolving ammonium metatungstate and platinum salt at 1:0.02-2 into distilled water, to prepare the mixture solution whose ammonium metatungstate content is 2. 5-50wt%; leading said solution into atomization drier to be atomized and dried to obtain the forward element of hollow H2WO3 / platinum salt; reducing and carbonizing the forward element; with inertia gas, cooling the product into room temperature, to obtain the final catalyst. The invention has simple process while the Pt / WC catalyst can be used in fuel battery with wide application.

The invention discloses a platinum-non-precious metal alloy nanowire, and an aqueous-phase synthesis method and application thereof, and belongs to the field of nanometer material science. According to the aqueous-phase synthesis method, coreduction of platinum salt and non-precious metal salt in an aqueous solution is achieved through a ligand, the controllable ultrafine platinum-non-precious metal alloy nanowire is successfully synthesized, and the technical problems are solved. A preparing method is simple, the yield is high, the steps are less, controllability is good, the nanowire in a product is small in diameter and uniform in structure, the surface of the ultrafine platinum-non-precious metal alloy nanowire prepared through the preparing method is easy to clean, and the ultrafine platinum-non-precious metal alloy nanowire has superior performance in hydrogen production through electrolytic water.

The invention relates to mimic enzyme. The mimic enzyme is a molybdenum disulfide sheet layer of which the surface is loaded with platinum-copper alloy nanoparticles. The preparation method comprises the step of performing reduction reaction for a water solution in which the molybdenum disulfide sheet layer, platinum salt and copper salt to obtain the mimic enzyme that is the molybdenum disulfide sheet layer of which the surface is loaded with the platinum-copper alloy nanoparticles. The mimic enzyme has a plurality characteristics of activity of oxidase, peroxidase and catalase; different mimic enzyme activity can be used for creating different methods or applied to the unknown fields; the preparation method is simple and easy to be carried out; the conditions are mild; the one-step method can be carried out to reduce and prepare through a water-phase system.

The invention provides a nano rod and a preparation method and application thereof. The preparation method includes: in the presence of solvent, allowing soluble platinum salt, soluble copper salt and reducing agent to be in contact with a gold nano rod, wherein for each mol of gold atom, 0.1-0.5mol of soluble platinum salt is used, 0.01-3mol of soluble copper salt is used, and 2-20mol of reducing agent is used. The nano rod prepared by the method has CuPt alloy nano island structures, selectivity on substrate catalyzing and high catalyzing efficiency are achieved, the catalytic activity, on an OPD, TMB+H2O2 system and H2O2, of the nano rod is evidently higher than that of the gold nano rod having only deposited platinum on the surface, and the nano rod prepared by the method is applicable to the fields of chemical and biological catalysis. In addition, the CuPt alloy nano island structures gather to two ends of the gold nano bar when the use amount of the soluble copper salt and the soluble platinum salt is increased, and accordingly nano rods of different morphologies and components can be obtained by the method.

The invention provides a method for preparing a carbon-supported ultra-low platinum catalytic electrode by means of indirect electrodeposition, which belongs to the fuel cell technique field. The method comprises the steps: transition metal M (such as: Cu, Co, Ni and the like) nano-particles in an aqueous solution are highly dispersed and deposited on a porous carbon electrode (PCE) bonded with perfluoro-sulfonated resin through a four-step electrodeposition method, then the obtained M / PCE electrode is immerged into a platinum salt solution for preparing the carbon-supported ultra-low platinum catalytic electrode through displacement reaction. The invention has the advantages of simple process and low costs. The prepared carbon-supported ultra-low platinum catalytic electrode has the advantages of low platinum loading, high electro-catalytic performance, good dispersion of platinum nano-particles and controllable sizes, and can replace the existing commercial platinum carbon (Pt / C) catalyst.

The invention provides a method for an anchoring platinum catalyst of a transition metal on a carbon nanotube, which pertains to the technical field of fuel cells. The method purifies the carbon nanotube sold on a market by concentrated nitric acid and uses mixed acid of hydrogen peroxide and the concentrated nitric acid for treatment to obtain the functionalized carbon nanotube. And then the functionalized carbon nanotube, partial platinum salt and all transition metal M salt are stirred and reflow for certain time, added with rest platinum salt to continue to reflow, cooled, washed centrifugally, dried and carried out heating treatment in a hydrogen atmosphere, thus obtaining the anchoring platinum catalyst of the transition metal on the carbon nanotube. The anchoring platinum catalyst of the transition metal on the carbon nanotube prepared by the invention has extremely good stability and the catalytic activation of oxygen reduction and can substitute kindred commercialized catalysts.

The invention provides an electrode catalyst with carbon-nitrogen nanometer fiber loading platinum-ruthenium nanometer particle. The carbon-nitrogen nanometer fiber is dispersed in solution containing platinum salt and ruthenium salt; a reducing agent is adopted for reduction; the electrode catalyst with carbon-nitrogen nanometer fiber loading platinum-ruthenium nanometer particle is gained after purification; the diameter of the carbon-nitrogen nanometer fiber ranges from 5nm to 300nm; the N / C atomic ratio is 0.01-0.25 and marked as CNx; wherein, x ranges from 0.01 to 0.25; the particle size of the platinum-ruthenium nanometer particle is 0.1-15nm; the proportion of the content (wt%) of the platinum or / and ruthenium nanometer particle and the carbon-nitrogen nanometer fiber mass is 1%-100%:1; the molar ratio of the platinum salt and the ruthenium salt is m:n; wherein, m ranges from 0.5 to1 and n ranges from 0 to1; the used reducing agent is ethylene glycol, sodium borohydride, potassium borohydride or nitrogen.

The invention provides a platinum-cobalt nano-alloy mimic enzyme. The structure of the platinum-cobalt nano-alloy mimic enzyme is formed by approximately spherical platinum-cobalt alloy nano particles; the preparing method of the platinum-cobalt nano-alloy mimic enzyme comprises the steps of using platinum salt and cobalt salt as metal precursors; dissolving the two precursors in an organic solvent; adding a surface active agent and a nucleation inhibitor in the organic solvent; carrying out heating reaction in a hydrothermal reactor after the organic solvent is uniformly stirred. According to the platinum-cobalt nano-alloy mimic enzyme provided by the invention, the platinum-cobalt nano-alloy mimic enzyme is prepared through a one-step reduction method, the preparing technology is simple, the repeatability is good, the stability is good, the cost is low, a catalytic activity which is similar to an oxide enzyme and peroxidase is showed, and the platinum-cobalt nano-alloy mimic enzyme can be used as a new oxide enzyme mimic enzyme and a new peroxidase mimic enzyme for replacing the oxide enzyme and the peroxidase to be applied to the fields of immunoassay, biological detection, clinical diagnosis and the like.

Nanoparticle sized metal or alloy is synthesized through a reverse micelle system which includes the steps of a) forming a concentrated aqueous solution of transition metal salts with platinum salts b) dispersing the metal salt solution in a non aqueous solution of a surfactant c) adding a reducing agent to reduce the metal salts to metallic alloy nano-particles in the absence of oxygen d) separating the metallic alloy nanoparticles 1s) heating the metallic alloy nanoparticles under controlled time, atmosphere and temperature conditions sufficient to form particles of a desired size and magnetic characteristics. The, precipitated metal or alloy nanoparticle has an average size of 3 nm and is superparamagnetic. Through controlled annealing treatment, the magnetic characteristics of the nanoparticles can be manipulated to achieve specific values in the final product that is suitable for predetermined applications. The nanoparticles exhibiting superparamagnetism are suitable for magnetic bio-bead applications. Weakly ferromagnetic magnetic alloy nanoparticles are suitable for actuator applications. The strongly ferromagnetic magnetic alloy nanoparticles exhibiting high coercivity can be potential candidate for magnetic data storage applications.

The invention relates to a fuel cell, a platinum-carbon catalyst and a preparation method of the platinum-carbon catalyst. The preparation method comprises the following steps of dissolving a platinum salt solution in an ethylene glycol solution to form a first mixed solution; dispersing the first mixed solution in a suspension liquid configured by carbon and ethylene glycol to form a second mixed solution; carrying out heating reflux on the second mixed solution in an alkali environment for first reaction; cooling the second mixed solution and carrying out second reaction in an acid environment; restoring a neutral environment of the second mixed solution, and drying the second mixed solution to obtain the platinum-carbon catalyst. By the preparation method, the preparation efficiency of the platinum-carbon catalyst can be improved.

The invention discloses a platinum-cobalt dual-metal catalyst with room-temperature benzene hydrogenation activity and a preparation method thereof. The preparation method of the platinum-cobalt dual-metal catalyst comprises the following steps: an activated carbon carrier is added to a solution A for water bath and is evaporated and baked to obtain a catalyst precursor; and the solution A is a water solution containing cobalt salt and platinum salt. The invention simplifies the baking step in the prior catalyst preparation method, simplifies technological flows and saves energy sources, and the obtained catalyst has higher metal specific area and can catalyze an aromatic hydrogenation reaction under a room temperature condition. The invention has important economic values.

The invention discloses a hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles. The method includes: dissolving precursor platinum salt and precursor ruthenium salt in water, adding polyvinylpyrrolidone and formaldehyde prior to mixing, placing mixture in a sealed container, and heating the container to 150 to 170 DEG C to allow 4 to 8 hours of reduction reaction so as to obtain the Pt-Ru bimetal nanoparticles. The Pt-Ru bimetal nanoparticles can serve as a good catalyst for low-temperature (130 to 170 DEG C) aqueous-phase Fischer-Tropsch synthesis, with catalytic activity superior to Ru nanoparticles made by methods such as H2 reduction and NaBH4 reduction and far superior to Fe and Co nanoparticles.

The invention discloses a PtRu binary metal nano-alloy catalyst which is of a flower-shaped (porous) structure. The synthetic method of the PtRu binary metal nano-alloy catalyst is characterized by comprising the steps that 1, a surface active agent and a reducing agent are added into water together, and stirring is conducted for 10-30 minutes at the indoor temperature, wherein the mass ratio of the surface active agent to the reducing agent is 1:2-2:1, and the amount of added water needs to meet the requirement that both the surface active agent and the reducing agent are completely dissolved in the water; 2, a metallic platinum salt pecursor solution and a metallic ruthenium salt pecursor solution are added in the mixed solution obtained in the first step, and stirring is conducted for 10-30 minutes at the indoor temperature,wherein the volume ratio of the platinum salt pecursor solution to the metallic ruthenium salt pecursor solution is 3:2-2:3, the ratio of the volume of the mixed solution to the total volume of the metallic pecursor solutions is 10:1-20:1, and the concentration of the metal salt precursor solution is 0.05-0.5 mol / L; 3, the mixed solution obtained in the second step is stirred for 5-30 minutes at the indoor temperature, a reaction is conducted in an autoclave for 1.5-3 hours, and the temperature is controlled to be 180-230 DEG C; 4, the product obtained in the third step is cooled and then is washed, and the PtRu binary metal nano-alloy catalyst of the flower-shaped (porous) structure is obtained after centrifugal separation.

The invention relates to a preparation method of a Pt-pd alloy type catalyst. The preparation method comprises the following steps: (1) dissolving polyoxyethylene-polyoxypropylene segmented copolymer used as a reducing agent and a protecting agent into deionized water to obtain copolymer solution; (2) adding platinum salt solution and palladium salt solution into the copolymer solution obtained in the step (1), reacting while stirring, cooling the reaction system to be at room temperature after finishing the reaction to obtain Pt-Pd alloy nanoparticle sol; and (3) adding an electrical conductive carrier into the Pt-Pd alloy nanoparticle sol in the step (2), stirring to load the Pt-Pd alloy nanoparticle sol on the electrical conductive carrier, separating, washing, and drying to obtain the Pt-Pd alloy type catalyst.

The invention discloses an S-doped carbon material supported Pt composite catalyst and a preparation method and application thereof. The method comprises the following steps: adding a carbon materialand a sulfur source into ethanol, and carrying out ultrasonic mixing to obtain a uniformly mixed suspension; stirring and heating the suspension until the solvent is evaporated to dryness; after drying, grinding, and calcining in inert gas at high temperature to obtain an S-doped carbon carrier; stirring and ultrasonically dispersing in distilled water, adding a metal platinum salt precursor, ultrasonically stirring uniformly, adjusting the pH value, stirring at constant temperature, cooling to room temperature, performing suction filtration, washing, drying, grinding, and reducing in a hydrogen atmosphere. The S-doped carbon material is prepared by adopting a high-temperature annealing method, and the high-dispersion Pt catalyst is loaded by adopting an impregnation method, so that the preparation method is simple and effective, and the loaded Pt catalyst is uniform in morphology, high in dispersity and high in Pt utilization rate, has excellent electrocatalytic performance and stability, and has a good application prospect in the field of electrocatalysis.

The invention discloses a making method of a platinum iridium oxide alloy electrode. The method includes the following steps: heating and stirring a platinum salt and sodium nitrate mixed solution to 55-65DEG C, carrying out evaporating crystallization, drying, grinding, calcining to obtain a mixture, washing the mixture by water to remove impurities, carrying out full wet grinding, and dispersing the wet ground mixture in a solvent to obtain a platinum dioxide solution; dispersing an iridium salt in the solvent, adding the platinum dioxide solution, adjusting the pH value to 14 by using sodium hydroxide, and dissolving and dispersing to obtain a coating solution; and coating a titanium plate with the coating solution, drying, calcining at 400-700DEG C, and cooling in air to obtain the platinum iridium oxide alloy electrode. The above platinum iridium oxide titanium anode electrocatalysis material prepared in the invention has the characteristics of fine crystsal grains and honeycomb shape; and the anodic chlorine evolution electrocatalytic activity is high, and the service life is long, so the electrode is suitable for preparing electrolyzed oxidizing water, and the use cost is reduced.

The invention discloses a preparation method and application of an integral combustion catalyst for a platinum-based honeycomb iron-chrome-aluminium wire mesh. In the preparation method provided by the invention, a chemical plating technology is adopted, chloroplatinic acid is used as platinum salt, ethylenediamine and ethylene diamine tetraacetic acid disodium salt are used as a complexing agent, sodium borohydride is used a reducing agent, and an iron-chrome-aluminium wire mesh is used as a substrate; precious metals can be loaded directly without precoating an aluminum oxide film on the surface of the substrate of the metal wire mesh, therefore, the preparation method is simple and convenient, and the needed equipment is also very simple; the platinum component in the prepared catalyst is firmly loaded on the surface of the substrate of the metal wire mesh, therefore, no peeling and falling phenomena are caused in a bending test and an adhesion tape test; meanwhile, the content of platinum as the precious metal in the integral combustion catalyst prepared by the invention is only 0.05-0.3wt%, however, when the integral combustion catalyst is used for the catalytic combustion and purification treatment of methylbenzene, the conversion rate of the methylbenzene can be up to over 90% at lower temperature of about 180 DEG C, therefore, an excellent low-temperature catalytic purification effect is achieved.

The invention relates to a high stability nanogold catalyst and a preparation method thereof. The nanogold catalyst is of a Yolk-Shell structure, the platinum is a shell, the gold is a core, and a gap for allowing a gold core to move is formed between the shell and the core. The preparation method of the high stability nanogold catalyst adopts dimethylformamide, polyhydric alcohols, an inorganic silver salt precursor, an inorganic platinum salt precursor, an inorganic silver salt precursor and a surface active agent as reaction raw materials, ammonia water, an inorganic salt containing halide ions and copper-containing inorganic salt as addition agents, the reaction raw materials and the additional agents react to synthesize gold / silver / platinum nano-particles with layered structure, and then silver is corroded by nitric acid, so as to obtain the high stability nanogold catalyst. The high stability nanogold catalyst and the preparation method provided by the invention have the advantages that the prepared non-loaded nanogold particles are packed by a multi-hole shell, so that the nanogold particles can keep high activity and stability, and influence of a carrier on the nanogold particles are also avoided.

The invention discloses a synthesis method of a Cu octahedron PtCu-rich nano-catalyst. The synthesis method is characterized by comprising the following steps of (1) adding metal platinum salt and copper salt into an organic solvent DMF (Dimethyl Formamide), and stirring for 5 to 8 minutes at room temperature, wherein the amount of a metal salt precursor is 0.01 to 0.1mol; the molar ratio of a platinum salt precursor to a copper salt precursor is (5:1) to (1:5); the amount of the organic solvent DMF is required for completely dissolving the platinum salt and the copper salt; (2) adding glucoseand CTAB (Cetyltrimehtyl Ammonium Bromide) into a mixed solution obtained in the step (1), and stirring for 3 to 10 minutes at room temperature; (3) adding formaldehyde into a mixed solution obtainedin the step (2), and stirring for 1 to 10 minutes at room temperature, wherein the volume ratio of the formaldehyde to the DMF is (1:1) to (1:8); (4) transferring a mixed solution obtained in the step (3) into a high pressure reactor, reacting for 6 to 24 hours, and controlling the temperature to be 120 to 200 DEG C; (5) cooling a product obtained in the step (4), washing, and centrifugally separating to obtain a Cu octahedron PtCu-rich nanocrystal.

The present invention discloses synthesis process of N-methyl morpholine. The mixture of morpholine and methanol as the material after being gasified is made to pass through fixed bed containing supported catalyst to produce amination reaction under hydrogen condition; and the resultant is condensed, collected, dewatered and rectified to obtain N-methyl morpholine. The supported catalyst is prepared with metal salt solution of at least two of copper salt, nickel salt, cobalt salt, palladium salt and platinum salt and carrier and has metal accounting for 33-41 wt%. The synthesis process of the present invention can produce N-methyl morpholine of high purity in the yield up to 85 %.

An object of the present invention is to provide a platinum catalyst for a fuel cell, the platinum catalyst having platinum particles with a fine particle size which are supported on carbon carriers in a highly dispersed manner. To achieve the above object, the present invention provides a method for producing an electrode catalyst for a fuel cell, the method comprising: an ammonia treatment step of heat-treating carbon carriers in an ammonia gas atmosphere; a platinum salt contact step of mixing the carbon carriers treated with ammonia with a solution prepared by dissolving a platinum salt in a solvent and bringing the platinum salt coming into contact with the carbon carriers in the mixture that has been formed; a recovery step of recovering the carbon carriers by removing the solvent from the mixture; and a heat treatment step of heat-treating the recovered carbon carriers in an inert gas atmosphere.

The invention provides a platinum nanometer material with a flower-like structure. The flower-like nanometer structure is single and uniform in appearance and controllable in size. The preparation method comprises the following steps of: filling mixed solution of iodide and soluble platinum salt precursor in 120-180 DEG C polyhydric alcohol thermal solution, and maintaining the temperature and stirring for 1-3 hours. The raw material of the preparation method is cheap and easy to obtain; the equipment technology is simple; and the yield is higher. The material has large potential application in the fields such as heterogeneous catalysis, electro-catalysis and photocatalysis.

The invention provides a preparation method of sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst, belonging to fuel cell technical field. The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst. The sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst prepared by the invention has good stability and catalytic performance, can effectively settle the technical problems that the catalyst surface area is lowered and the activity is declined caused by surface migration and agglomeration growth on carbon carrier of platinum nanometer particles, and can also replace homogeneous commercialized catalyst.

The invention discloses a preparation method of a catalyst for the one-step preparation of p-aminophenol from nitrobenzene. The method comprises the following steps: preprocessing active carbon; loading a platinum salt; loading a vanadate; and reducing a catalyst, wherein the mass percentage contents of platinum and vanadium in the catalyst are 0.5-5% and 0.05-0.2% respectively. The invention also discloses a method for the one-step preparation of p-aminophenol from nitrobenzene through utilizing the catalyst. The addition of a certain amount of metallic vanadium to the Pt / C catalyst reduces the poisoning effect of sulfides in the nitrobenzene raw material to platinum, prolongs the service life of the catalyst and also improves the catalysis activity and selectivity of the catalyst; and the prepared catalyst has stable performances and very good repeatability, can be used for catalyzing the one-step preparation of p-aminophenol from nitrobenzene, reduces the purity requirement of the raw material nitrobenzene and reduces the catalysis cost.

The invention provides a core-shell structure nanometer material for silver cores / platinum shells and a preparation method of the core-shell structure nanometer material, and belongs to the field of functional materials. The core-shell structure nanometer material is composed of silver single-crystal cores and a platinum shell layer. The overall particle size ranges from 1 nm to 40 nm. The particle size of the silver single-crystal cores ranges from 0.1 nm to 38 nm. The thickness of the platinum shell layer is extremely small. The particle size of the silver single-crystal cores is uniform. The overall morphology of the material is uniform. The material is high in dispersibility. The preparation method includes the steps of firstly, preparing a sodium citrate solution, adding inorganic silver salt precursors, obtaining a mixed solution after conducting stirring, adding sodium borohydride, and continuing to conduct stirring to obtain a silver seed crystal solution; secondly, adding surface active agents and reducing agents in the silver seed crystal solution obtained in the first step, adding inorganic platinum salt after the heating reaction, taking sediment after cooling and centrifugation, and obtaining the core-shell structure nanometer material for silver cores / platinum shells. The preparation method is simple in process, easy and convenient to operate, high in repeatability, gentle in used reaction condition and friendly to the environment.