199 results about "Platinum salts" patented technology

The invention provides a platinum-carbon catalyst taking hollow carbon nanospheres as a carrier and a preparation method of the platinum-carbon catalyst. The method comprises the following steps: adding a polymer monomer into a nano template dispersion liquid with a uniform size; then adding a proper amount of platinum salt into the solution to obtain a mixed solution, and stirring to react for 0.5-30 hours to obtain a reaction product; and annealing the reaction product, and then removing the nano template to obtain the platinum-carbon catalyst. The obtained platinum-carbon catalyst takes the hollow carbon nanospheres as a carrier and has a larger specific surface area, the platinum catalyst is loaded on the surfaces of the carbon nanospheres and can be in better contact with an electrolyte, and the obtained catalyst has good electrochemical activity and shows excellent electro-catalytic hydrogen evolution performance and oxygen reduction performance; and the related preparation method is simple and reliable, is suitable for preparation of an electrocatalytic hydrogen evolution electrode and an oxygen reduction electrode, and has a good application prospect in the fields of proton exchange membrane electrolytic cells, hydrogen fuel cells and the like.

The invention relates to the technical field of catalysts, in particular to a carbon monoxide oxidation catalyst and a preparation method thereof. The catalyst is prepared by the method. The method comprises the following steps: adding a required amount of platinum salt and assistant salt into water for dissolving to obtain a mixed solution; dropwise adding the mixed solution into a required amount of tungsten-titanium powder, and stirring while dropwise adding until a muddy substance is obtained; adding a binder into the mud, uniformly stirring and mixing, and extruding to obtain an integral honeycomb mud blank; sequentially carrying out first drying treatment and first roasting treatment on the integral honeycomb mud blank to obtain an integral honeycomb carrier; placing the integral honeycomb carrier in a tetrabutyl titanate alcoholic solution for soaking treatment; and sequentially carrying out second drying treatment and second roasting treatment on the soaked integral honeycomb carrier to obtain the carbon monoxide oxidation catalyst. According to the invention, the carbon monoxide oxidation catalyst with high catalytic activity, strong toxicity resistance and good stability can be prepared.

The invention relates to a metal additive modified Pt-loaded CeO2 catalyst, preparation and application thereof in CO oxidation, and belongs to the technical field of industrial catalysis. The preparation process of the catalyst mainly comprises the following steps: respectively dissolving cerium salt, platinum salt and auxiliary metal salt in deionized water to prepare corresponding precursor solutions; then, mixing the three solutions, and dropwise adding ammonia water under a stirring condition until yellow precipitates are generated; and finally, drying and washing the precipitate, and calcining the solid powder in a proper atmosphere to obtain the assistant metal modified Pt / CeO2 catalyst. La, Pr, Nd or Sm auxiliary metal is introduced into the Pt / CeO2 catalyst, so that the CO catalytic oxidation performance of the catalyst can be improved, and the poisoning resistance of the catalyst in an SO2-containing environment can be enhanced. The method has important significance in the actual industrial application, especially in the catalytic oxidation process under the condition of treating complex flue gas.

The invention provides a hydrogen evolution catalysis self-supporting electrode and a preparation method thereof, and belongs to the technical field of electrochemical catalysis. The problems that an existing Pt-based electrocatalyst electrode is high in manufacturing cost, insufficient in durability, weak in corrosion resistance and the like are solved. The preparation method comprises the following steps: firstly, placing a carbon cloth subjected to ultrasonic cleaning and plasma treatment in a metal spraying instrument to deposit a Pt seed crystal layer, and then growing a Pt nanosheet on the carbon cloth through electro-deposition in a mixed solution of sulfuric acid, platinum salt and lauryl sodium sulfate; and cleaning the Pt nanosheet coated carbon cloth with deionized water, and carrying out vacuum drying to obtain the low-Pt-load hydrogen evolution catalytic self-supporting electrode applicable to all pH. The Pt nanosheet is directly grown on the carbon cloth to obtain the hydrogen evolution electro-catalysis electrode, so that the coating of a catalyst and the use of a binder in the conventional preparation process of the electrode are avoided; due to the high porosity of the carbon cloth substrate and the vertical distribution of the Pt nanosheets, the electrode has high specific surface area and excellent charge transfer capacity, and the intrinsic activity and density of catalytic active sites are improved.

The invention provides a platinum-carbon catalyst as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing platinum salt, a reducing agent, water and a carbon carrier to obtain a dispersion, and performing hydrothermal reaction, washing and solid-liquid separation on the dispersion to obtain the platinum-carbon catalyst, a complexing agent and a dispersing agent are not added in the preparation method. According to the preparation method, a dispersing agent, a complexing agent and the like are not added, impurities cannot be introduced into the platinum-carbon catalyst, the preparation method is easy to operate, reaction conditions are easy to control, the preparation method is suitable for batch production, the yield of the catalyst can reach 95% or above, and the catalyst has excellent catalytic performance.

The invention relates to the technical field of contact lens care and catalysis, in particular to a platinum alloy neutralization ring for a hydrogen peroxide care solution and a preparation method of the platinum alloy neutralization ring. The problems that in the prior art, a platinum alloy is poor in neutralization ring cycle catalytic performance and insufficient in antibacterial and bactericidal performance are solved. The preparation method comprises the following steps: adding an organic solvent and a silver nitrate solution to carry out swelling treatment, surface silver ion plating and reduction on a plastic substrate to obtain a silver-plated substrate, complexing a metal complexing agent and platinum salt, and activating by sodium nitrite to form a platinum nano layer on the surface of the silver-plated substrate to obtain a platinum alloy neutralization ring; the type of the metal complexing agent is adjusted to improve the stability of the plating solution A; the chemical plating temperature and time are controlled, and the catalytic rate of a neutralization ring is increased; the dosage composition ratio of the metal complexing agent is controlled, and the catalytic ability of the neutralizing ring is improved; the cyclic catalytic performance of the neutralization ring is improved by changing the dosage of the organic solvent; the use amount of each component of the organic solvent and the use amount of silver nitrate are adjusted, so that the antibacterial property of the platinum neutralizing ring is improved.

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The present invention discloses a platinum electroplating solution, a preparation method thereof and an application in semiconductors, which comprises the following raw materials: 0.5-10 g / L of platinum salt PEP, 15-35 g / L of ethylenediamine sulfate, 5.0-29 g / L of malonic acid, 5.0-40 g / L of ammonium acetate, the balance being ultrapure water and ammonia water; the pH value of the platinum electroplating solution is adjusted to 7.0 with ammonia water; the method for preparing the coating comprises the following steps: S1, degreasing and pickling the semiconductor device to be processed; S2, selecting corresponding electroplating conditions and configuring a corresponding anode and its anode mask; S3, performing electroplating; S4, automatically adding the platinum salt PEP solution in a linked manner; S5, adjusting the pH value of the platinum electroplating solution; S6, stopping electroplating after reaching the target coating thickness or the preset electroplating time. The platinum metal film formed by the present invention has excellent morphology, uniform distribution, high wear resistance and excellent compactness.

The invention discloses a superfine nano platinum black catalyst with a three-dimensional self-supporting structure and a preparation method and application thereof, and relates to the technical field of catalysts.The preparation method comprises the following steps that platinum salt is dissolved in water, and a first solution is obtained; adding a water-soluble inorganic polymerization inhibitor into the first solution, and stirring and mixing at a first temperature to obtain a second solution; adding an alkaline solution into the second solution, and stirring and mixing at a second temperature to obtain a third solution; drying the third solution to obtain precursor powder; placing the precursor powder in a reducing atmosphere, and carrying out heat treatment at a third temperature to obtain a catalyst semi-finished product; soaking, dispersing, washing and drying the obtained catalyst semi-finished product in a small molecular alcohol water solution to obtain the platinum black catalyst, and interweaving platinum nanowires of the platinum black catalyst to form a three-dimensional network with a porous structure and a large specific surface area. The catalyst shows excellent catalytic activity, durability and mass transfer performance.

The invention belongs to the technical field of ammonia synthesis and electro-catalysis, and particularly relates to a preparation method and application of high-entropy alloy aerogel for electro-catalysis. The preparation method comprises the following steps: mixing an inorganic metal salt in a solvent to obtain a precursor solution, quickly adding a reducing agent, standing, and washing and drying the obtained product to obtain the high-entropy alloy aerogel catalyst, the inorganic salt is selected from five or more of copper salt, cobalt salt, iron salt, nickel salt, palladium salt, gold salt, ruthenium salt, platinum salt and silver salt. The three-dimensional continuous porous reticular high-entropy alloy aerogel is obtained through one-step reduction of the inorganic metal salt and standing assembly, the high-entropy alloy aerogel prepared through the method is high in reduction assembly speed, phase separation of multi-component alloy can be effectively inhibited, an amorphous alloy structure is obtained, and therefore when the high-entropy alloy aerogel is applied to ammonia production through electro-catalysis nitrate reduction, the high-entropy alloy aerogel can be used for preparing the high-entropy alloy aerogel. And excellent electrochemical activity and stability can be presented in an ultra-low overpotential range of-0.2 to + 0.2 V vs.RHE.

The invention discloses an electrolytic solution of a platinum-rhodium alloy, a preparation method and a preparation method of a plating layer of the platinum-rhodium alloy, and belongs to the technical field of precise electroplating. The electrolytic solution comprises a platinum salt, a rhodium salt, a first additive, a second additive, a first complexing agent, a second complexing agent, a first stabilizer and a second stabilizer, the first additive is a sulfamic acid compound containing 3-4 hydroxyalkyl groups, the second additive is sulfamic acid salt containing 3-4 hydroxyalkyl groups, and the first complexing agent and the second complexing agent are a platinum salt and a rhodium salt. The first complexing agent is a mixture of dicarboxylic acid and dicarboxylic acid containing amino or hydroxyl, the second complexing agent is a salt corresponding to the dicarboxylic acid, and the first stabilizer is a mixture of alkyl sulfonic acid and alkyl sulfonate. Through the synergistic effect of the additive, the complexing agent and the stabilizer, the additive, the complexing agent and the stabilizer form a five-membered to seven-membered heterocyclic coupling structure with platinum ions and rhodium ions, and the stability of the electrolytic solution is remarkably improved. And the obtained platinum-rhodium alloy coating is compact and uniform, and has excellent nitric acid steam and mixed gas corrosion resistance.

The invention discloses a platinum chemical plating solution and a preparation method and application thereof in semiconductors, the platinum chemical plating solution comprises the following raw materials: 0.5-10.0 g / L of platinum salt PEP, 2.1-10.0 g / L of ethylenediamine sulfate, 1.2-8.9 g / L of malonic acid, 5-50 g / L of ammonium acetate, 1.2-9.2 g / L of thiourea dioxide, and the balance of ultrapure water and ammonia water; and the pH value of the solution is adjusted to 7.0 by ammonia water. The platinum chemical plating solution disclosed by the invention is suitable for nano precision manufacturing and processing on the surface of an electronic element product of a semiconductor device, and a formed platinum metal film has excellent uniform distribution, compactness and high wear resistance; a semiconductor electronic component product with excellent plugging performance, corrosion resistance, high-precision conductivity and high-quality electronic signal transmission performance is obtained.

The invention discloses a preparation method of platinum-based multi-metal aerogel and application of the platinum-based multi-metal aerogel in an electro-catalysis hydrogen evolution reaction. The method comprises the following steps: firstly, sequentially adding platinum salt and other metal salts into pure water, uniformly mixing, then adding a sodium borohydride solution, uniformly mixing, quickly freezing the reaction solution with liquid nitrogen, melting to obtain wet gel, and then washing and drying the wet gel to obtain the aerogel. The obtained metal aerogel is applied to a hydrogen evolution electrocatalyst and shows excellent catalytic activity under an alkaline condition. The preparation method has the advantages that the synthesis process is simple, convenient and efficient, regulation and optimization of an electronic structure can be realized through interaction among multiple metals, so that the catalytic performance is improved, the porous structure of the aerogel effectively provides a high-speed mass transfer channel, the catalytic activity is improved, and the preparation method is suitable for industrial production. And a solid foundation is laid for wide application of the metal aerogel material in the field of industrial chemical engineering.

The invention provides a catalyst for preparing small-diameter single-walled carbon nanotubes and a preparation method thereof.The preparation method of the catalyst comprises the steps that soluble ferric salt, soluble platinum salt and auxiliaries are weighed, mixed and dissolved in water, the mixture is stirred to be uniform, and a solution A is obtained; adding a pretreated carrier into the solution A, uniformly stirring, continuing to heat and evaporate to dryness, and grinding to obtain a solid B; finally, the solid B is subjected to in-situ reduction with hydrogen at 500 DEG C for 1 h and then purged with nitrogen, and the catalyst for preparing the small-pipe-diameter single-wall carbon nanotube is obtained. The Fe-Pt alloy is used as a catalyst, Fe is used as a main active metal, and carbon source cracking and carbon tube nucleation are driven; the synergistic effect of Fe-Pt can improve the carbon deposition resistance of the catalyst, prolong the service life of the catalyst, further effectively reduce the pipe diameter of the SWCNTs and significantly improve the overall quality of the SWCNTs.

The invention belongs to the field of electrochemistry, and particularly relates to a carbon-coated efficient and stable platinum-based alloy nano-catalyst as well as a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: in the process of preparing an organic polymer precursor, adding transition metal and rare earth metal salts, and uniformly implanting the added metal elements into the organic polymer precursor through the ligand chelation of organic weak acid radicals; then performing high-temperature pyrolysis and carbonization to obtain a porous carbon carrier with carbon layer coated transition metal particles and rare earth element oxide distribution; and taking the porous carbon as a carrier, dipping in a platinum salt solution, and carrying out reducing atmosphere heat treatment to realize migration of reduced platinum and rare earth elements to the surfaces of carbon-coated transition metal particles and realize in-situ alloying, thereby finally obtaining the platinum-based alloy nanoparticle composite catalyst with the carbon coating layer. The preparation method is simple and effective, and has a wide application prospect in the field of new energy such as hydrogen energy based on the unique structural characteristics of the obtained catalyst.

The invention discloses an ammonia nitrogen electrochemical sensitive electrode based on a platinum-zinc-copper ternary alloy and a preparation method thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, dissolving platinum salt, copper salt and zinc salt in deionized water according to a certain proportion to prepare a precursor solution for electrodeposition; and then, constructing a three-electrode system by taking the cleaned carbon cloth substrate as a working electrode, a platinum sheet as a counter electrode and Ag / AgCl as a reference electrode, and depositing a platinum-zinc-copper ternary nano-alloy sensitive material on the carbon cloth substrate through an electrochemical cyclic voltammetry to obtain the ammonia nitrogen electrochemical sensitive electrode based on the platinum-zinc-copper ternary alloy. Finally, the electrode is used for sensitive detection of ammonia nitrogen in water. The detection performance of the platinum-zinc-copper ternary alloy electrode on ammonia nitrogen is superior to that of a sensitive electrode of the same type, and the platinum-zinc-copper ternary alloy electrode has the advantages of low cost, high sensitivity, wide linear range, low detection limit and the like, shows good repeatability and interference resistance, and can realize rapid detection and real-time monitoring on ammonia nitrogen in water.

The invention discloses a preparation method and application of a boron nitride confined platinum single atom-platinum cluster double-site catalyst. The preparation method comprises the following steps: mixing urea, boric acid and carbon nanotubes, and grinding; the ground mixture is placed in an ammonia-argon mixed atmosphere environment for first pyrolysis, and powder is obtained; adding the powder into a boric acid solution, heating and stirring to obtain a defect-rich boron nitride carrier; and washing and drying the carrier, immersing the carrier in a platinum salt aqueous solution, carrying out ultrasonic dispersion, carrying out a vacuum freeze drying method, and finally carrying out second pyrolysis on the dried sample in an ammonia-argon mixed atmosphere to obtain the platinum single atom-platinum cluster composite structure (PtSA-C (at) eBN-CNT) material. The material can efficiently and synergistically catalyze an electrochemical hydrogen evolution reaction (HER) under an alkaline condition (1M KOH), can be applied to a membrane electrode electrochemical cell as a cathode catalyst, shows excellent catalytic activity and stability under working conditions, and has good industrial application potential.

The invention discloses a titanium dioxide-based catalyst, a preparation method thereof and application of the titanium dioxide-based catalyst in catalytic ozonation of VOCs toluene, and belongs to the technical field of low-temperature catalytic oxidation. The preparation method of the titanium dioxide-based catalyst comprises the following steps: mixing titanium dioxide with a soluble metal solution to obtain a turbid liquid; and drying the turbid liquid, and calcining to obtain the titanium dioxide-based catalyst. The soluble metal solution is one or more of a soluble copper salt solution, a soluble platinum salt solution, a soluble cobalt salt solution and a soluble palladium salt solution. In addition, the invention also provides the titanium dioxide-based catalyst which is prepared by the preparation method. In addition, the invention also provides an application of the titanium dioxide-based catalyst in catalytic ozonation of toluene. The titanium dioxide-based catalyst provided by the invention can efficiently catalyze VOCs at low temperature, especially has 100% catalytic activity at 75 DEG C, and realizes low-temperature removal of toluene.

The invention belongs to the technical field of functional metal cluster preparation, and particularly relates to a platinum cluster with nano-enzyme and visible light catalysis functions and a preparation method and application thereof. The platinum cluster takes 6-aza-2-thiothymine as a ligand and platinum salt as a precursor, arginine is added to modify the ligand, and the platinum cluster is synthesized through a hydrothermal method. The platinum cluster is suitable for an environment with a pH value of 3-7.4. The platinum cluster disclosed by the invention has relatively high peroxidase activity and visible light catalytic activity.

The invention relates to the technical field of catalyst preparation, in particular to a neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving an organic titanium salt and a soluble neodymium salt in ethanol to obtain a mixed solution; mixing the ethanol dispersion liquid of the SiO2 spheres, the mixed solution and ammonia water, and carrying out hydrothermal reaction to obtain Nd-SiO2 (at) TiO2 core-shell spheres; etching SiO2 in the Nd-SiO2 (at) TiO2 core-shell sphere by adopting a sodium hydroxide solution to obtain a neodymium-doped titanium dioxide hollow sphere; and dropwise adding a sodium borohydride solution into an aqueous solution of the neodymium-doped titanium dioxide hollow spheres and a soluble platinum salt, and carrying out a reduction reaction to obtain the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst. The preparation method provided by the invention not only improves the photocatalytic efficiency and electro-catalytic reaction activity of the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst, but also enhances the long-term stability and durability of the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst.

The invention discloses an 8-hydroxyl dictamnine platinum complex with high activity in vitro and vivo as well as a synthesis method and application thereof. According to the invention, 8-hydroxy dictamnine is used as an active ligand and reacts with cis-Pt (DMSO) 2Cl2 platinum salt to synthesize the 8-hydroxy dictamnine platinum complex. The 8-hydroxyl dictamnine platinum complex can inhibit the growth of human ovarian adenocarcinoma cis-platinum drug-resistant cells SK-OV-3 / DDP in a targeted manner, shows excellent anti-tumor activity, has potential medicinal value, and is expected to be used for preparing various anti-tumor drugs.

The invention relates to a preparation method of supported porous carbon for catalyzing hydrosilylation reaction, which comprises the following steps: (S1) mixing thermoplastic phenolic resin, polyindole boric acid and a stabilizer, and heating to react to obtain modified phenolic resin; the mass ratio of the thermoplastic phenolic resin to the polyindole boric acid is 100: (15-25); (S2) dissolving the modified phenolic resin, a pore-foaming agent and a curing agent in a solvent, removing the solvent, and crushing to obtain solid particles; (S3) carrying out thermocuring, pre-oxidation, carbonization, activation and oxidation treatment on the solid particles in sequence to obtain oxidized porous carbon; (S4) modifying the oxidized porous carbon with vinyl siloxane to obtain vinyl siloxane modified porous carbon; and (S5) dipping the vinyl siloxane modified porous carbon in an alcoholic solution of platinum salt to obtain the supported porous carbon. The supported porous carbon prepared by the invention has excellent catalytic efficiency and good stability when being used for catalyzing hydrosilylation reaction, and can be recycled.

The invention relates to a catalyst for oxidative removal of CO in low-temperature high-sulfur sintering flue gas of steel, the catalyst takes four mixed oxides of Al2O3, SiO2, TiO2 and ZrO2 as a carrier, Pt atoms dispersed in a monatomic layer as an active component and La2O3, CeO2, SnO2 and Nb2O5 as active auxiliaries, the four oxides are firstly mixed and roasted in the preparation process to obtain a catalyst carrier, and the catalyst carrier is added into the catalyst for oxidation removal of CO in the low-temperature high-sulfur sintering flue gas of the steel, so that the catalyst can be used for oxidation removal of CO in the low-temperature high-sulfur sintering flue gas of the steel. Then fully mixing the active auxiliary agent and the catalyst carrier, carrying out microwave heating to obtain catalyst pug, finally spraying a platinum salt solution to the surface of the catalyst pug in the form of steam to obtain a monatomic Pt-loaded catalyst pug precursor, and molding to obtain the catalyst. The catalyst prepared by the invention has good CO oxidation catalytic activity and poisoning resistance in steel sintering flue gas at 120-200 DEG C.

The invention provides a preparation method of a low-load RuPdPt ternary noble metal electrocatalyst. The preparation method comprises the following steps: etching foamed nickel in a hydrochloric acid solution, and soaking the etched foamed nickel in a mixed solution containing ferric chloride, copper chloride and sodium chloride for 3-12 hours to obtain a NixFeyCuzOOH substrate; ruthenium salt, platinum salt and palladium salt are mixed and then ground, water is added to prepare a mixed solution, then an alcoholic solution of dimethylglyoxime disodium salt octahydrate is added, and a precious metal mixed solution is formed after ultrasonic dispersion; the preparation method comprises the following steps: soaking a NixFeyCuzOOH substrate in a noble metal mixed solution, soaking for 1-6 hours under stirring and heating conditions, washing an obtained product with water, and drying to obtain the RuPdPt-NixFeyCuzOOH composite catalyst. According to the invention, the noble metals Ru, Pd and Pt are combined with the substrate NixFeyCuzOOH nanosheets through M1-M2-O bonds, so that monatomic-cluster sites of the noble metals Ru, Pd and Pt are effectively anchored, and the stability of the catalyst at high current density is greatly improved.

The invention provides a preparation method of porous platinum powder, which is characterized by comprising the following steps: (1) immersing a platinum sheet in a hydrochloric acid solution, mixing with an oxidizing agent, heating and boiling until the platinum sheet is completely dissolved, and sequentially cooling and filtering for the first time to obtain a platinum-containing filtrate; (2) heating the platinum-containing filtrate obtained in the step (1), mixing the platinum-containing filtrate with a platinum precipitant, and sequentially carrying out secondary filtration, primary washing and drying treatment to obtain platinum salt powder; and (3) mixing the reduced mixed solution and the platinum salt powder obtained in the step (2) under a stirring condition, and then sequentially standing, filtering for the third time, washing for the second time, ultrasonically cleaning and drying to obtain the porous platinum powder. The porous platinum powder obtained by adopting the preparation method provided by the invention is relatively large in specific surface area, so that the platinum powder has relatively high reaction activity and gas adsorption capacity; in addition, the preparation method is relatively friendly to health and environment.

The application discloses a supported PtNi b-site adiponitrile hydrogenation catalyst and a preparation method and application thereof, and belongs to the technical field of thermal catalysis. The preparation method comprises the following steps: (1) dispersing ammonium tungsten oxide pentahydrate in water, adding an acidic solution, condensing and refluxing, heating and reacting, centrifugal filtering and drying the precipitate to prepare tungsten oxide nanorod carriers; (2) dispersing the tungsten oxide nanorod carriers in a solvent, adding a platinum salt solution, stirring, evaporating the solvent, and calcining the solid to prepare a catalyst precursor; and (3) dispersing the catalyst precursor in a solvent, adding a nickel salt solution, stirring, evaporating the solvent, and calcining the solid to prepare the catalyst. The application introduces Pt and Ni on the reducible WO3 carrier to construct a bimetallic active site catalyst, and the bimetallic active site catalyst can catalyze the reaction of adiponitrile hydrogenation to prepare primary amine under mild conditions, has the characteristics of low noble metal loading, high activity and high selectivity, and has important industrial application value.

The application relates to the technical field of graphene, in particular to platinum-loaded nitrogen-doped graphene as well as a preparation method and application thereof. The preparation method of the platinum-loaded nitrogen-doped graphene comprises the following steps: mixing graphene oxide, a platinum salt and a solvent to form a mixed solution, and then performing a hydrothermal reaction to prepare graphene oxide-platinum salt composite powder; mixing the graphene oxide-platinum salt composite powder with an amino compound, and performing ball milling to prepare amino-modified graphene oxide-platinum salt composite powder; and performing microwave irradiation on the amino-modified graphene oxide-platinum salt composite powder to prepare platinum-loaded nitrogen-doped graphene. The preparation process is simple, and the prepared platinum-loaded nitrogen-doped graphene has good oxygen reduction catalytic activity.

This invention discloses a method for preparing a Pt / C catalyst by vacuum impregnation with an ionic liquid and its application. First, a carbon support is mixed with water and alcohol, ball-milled, and then mixed with nitric acid to obtain an acid-treated carbon support. Next, a precursor solution is prepared by mixing a platinum salt, an organic solvent, a surfactant, and water, and then an imidazole ionic liquid is added to it in portions to obtain a precursor solution containing the ionic liquid. This solution is mixed with the acid-treated carbon support and vacuum ball-milled to obtain a mixed slurry. This slurry is then vacuum freeze-dried to obtain a freeze-dried powder. Reduction and heat treatment are then performed to obtain the ionic liquid-doped Pt / C catalyst. The catalyst is then coated onto both sides of a proton exchange membrane to form a catalytic layer. Through this method, this invention not only effectively inhibits the aggregation, migration, and ripening of platinum particles during electrochemical processes, thereby significantly improving the catalyst's durability, but also enhances the catalyst's proton conductivity under low humidity conditions.

The invention relates to a fuel cell catalyst and a preparation method thereof, and belongs to the technical field of fuel cells. The preparation method of the fuel cell catalyst provided by the invention comprises the following steps: (1) performing heat treatment on conductive carbon black to obtain graphitized conductive carbon black; (2) mixing ammonium iodide with the graphitized conductive carbon black obtained in the step (1) to obtain mixed powder, and calcining the obtained mixed powder to obtain an iodine-doped carrier; and (3) dipping the iodine-doped carrier obtained in the step (2) in a platinum salt solution, drying, and carrying out heat treatment in a reducing atmosphere to obtain the fuel cell catalyst. According to the preparation method, ammonium iodide easy to sublimate and conductive carbon black subjected to graphitization heat treatment are uniformly mixed, the ammonium iodide sublimates to the surface of the graphitized conductive carbon black in the heat treatment process to realize in-situ doping, an iodine-doped voltage-resistant carrier is formed, and then Pt is loaded on the iodine-doped voltage-resistant carrier, so that the Pt-loaded iodine-doped voltage-resistant composite material is obtained. The fuel cell catalyst with high stability and excellent electrochemical performance is obtained.

The invention discloses a dysprosium-doped platinum-based catalyst and a preparation method and application thereof, and belongs to the technical field of battery materials.The preparation method of the dysprosium-doped platinum-based catalyst comprises the following steps that a dysprosium-containing carbon carrier is placed in a first solvent to be subjected to ultrasonic dispersion, and turbid liquid is obtained; adding a soluble platinum salt and a soluble transition metal salt into the turbid liquid, and mixing to obtain a mixed liquid; removing the first solvent in the mixed solution to obtain a solid product; and calcining and etching the solid product to obtain the dysprosium-doped platinum-based catalyst. The dysprosium-containing carbon carrier is adopted to load the platinum-based intermetallic compound, so that dysprosium and the platinum-based nanoparticles can realize relatively strong association and generate interaction among electrons, atom diffusion is further promoted, the crystallinity is improved, and the electronic structure of the platinum nanoparticles is favorably adjusted. The dysprosium-doped platinum-based catalyst is relatively high in internal order degree, and has relatively high activity and stability when being applied to an acidic ORR reaction.