2068 results about "Platinum" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

The invention discloses a preparation method of flame-retardant silicone rubber resistant to long-term thermal aging, and relates to the technical field of high-molecular compound composition anti-aging rubber. The flame-retardant silicone rubber is prepared from the following components in parts by mass: 75 to 100 parts of methyl vinyl silicone rubber raw rubber, 18 to 28 parts of fumed silica, 20 to 35 parts of aluminum oxide trihydrate, 0.5 to 3 parts of platinum flame-retardant synergist, 2 to 5 parts of heat-resistant additive, 1.5 to 2.5 parts of structured control agent, 1 to 2 parts of cross-linking agent, 2 to 10 parts of anti-aging agent and 8 to 13 parts of fluorinated silicone rubber. Through a synergistic flame-retardant system, the silicone rubber disclosed by the invention shows obvious advantages in flame-retardant capability, can reach a higher flame-retardant grade, effectively delays flame propagation, and reduces the risk of fire disasters. The weather resistance of the silicone rubber is remarkably improved due to the ultraviolet absorption function and the anti-oxidation function of the anti-aging agent, so that the silicone rubber can effectively resist ultraviolet rays and oxidation under the long-term outdoor solarization condition, and the performance reduction and the appearance deterioration are reduced.

The invention provides a method and system for detecting the content of platinum, palladium and rhodium in an automobile exhaust purification catalyst and application, and relates to the technical field of automobile exhaust purification, the method comprises the following steps: crushing, grinding, sieving, performing microwave acidolysis, neutralizing, washing and drying a catalyst sample to obtain dry filter residues; a trapping agent and a fluxing agent are added into the dry filter residues, constant-temperature heating is conducted in inert gas, then cooling forming is conducted, and an alloy button is obtained; blowing ash on the alloy, then adding mixed acid into the alloy, heating the alloy in a water bath at 95 DEG C for 25-35 minutes to obtain a dissolved solution, then adding a masking agent into the dissolved solution, and oscillating to obtain a solution to be detected; and filtering the liquid to be detected, fixing the volume and detecting. According to the method, precise quantification of trace platinum, palladium and rhodium in the complex matrix catalyst can be realized, and the method has a relatively high recovery rate; meanwhile, pollution elements are prevented from being used, and the method is green and efficient and better conforms to the concept of green chemistry.

The invention relates to the technical field of proton exchange membrane fuel cell cathode catalysts, and discloses a nanoscale high-entropy intermetallic compound catalyst and a preparation method and application thereof. According to the nanoscale high-entropy intermetallic compound catalyst, a nitrogen-doped porous carbon material derived from zeolite imidazole skeleton-8 is taken as a carrier, and the metal elements of a high-entropy intermetallic compound comprise platinum, copper, cobalt, nickel and iron or platinum, ruthenium, copper, cobalt, nickel and iron. The preparation method of the catalyst comprises the following steps: step 1, preparing a zeolite imidazole framework 8; 2, preparing and purifying a nitrogen-doped porous carbon material carrier; step 3, loading a metal precursor; and 4, preparing the nano-scale high-entropy intermetallic compound catalyst. Nanoscale, high dispersity and structure ordering of the high-entropy intermetallic compound are achieved, the high-entropy intermetallic compound serves as a PEMFC cathode catalyst, the ORR quality activity and durability can be remarkably improved, and Pt loading capacity and cost are effectively reduced.

Composite materials with noble metal coated silver nanowires loaded into polymer are described. The composite materials may have resistivities of no more than about 100 Ohm-cm, or from about 100 Ohm-cm to about 1×1011 Ohm-cm depending on the amount of noble metal coated silver nanowires loaded into the polymer. The noble metal coated silver nanowires may be platinum coated silver nanowires. Metal particulates such as silver flakes or silver particles may be added to the composite materials in order to obtain desired properties. Composite precursor compositions and methods for preparing the composite materials are described.

The invention discloses a manufacturing method of 925 silver jewelry, which comprises the following steps: S1, preparing alloy components, S2, designing a cast tree structure, S3, casting, and S4, densifying a casting, the alloy components comprise 92.5-93.0% of silver, 1.0-3.0% of platinum, 0.05-0.5% of copper, 1.5-3.5% of zinc, 1.5-3.5% of indium, 0.03-0.3% of tin, 0.05-0.5% of germanium, 0.03-0.3% of rare earth, and 0.003-0.02% of boron. According to the manufacturing method, alloy components are optimized, the casting performance of the alloy components is improved, the casting process is optimized, the feeding capacity of molten metal is improved, shrinkage porosity and air holes are reduced, the initial density of the casting is improved, and subsequent composite treatment is carried out, so that the density from the surface to the shallow surface of the casting is further improved, grains are refined, and the surface roughness is further reduced; and the requirement of high brightness of the jewelry surface is met.

The invention discloses a Pt-ZnO / In2O3 catalyst for preparing methanol through hydrogenation of carbon dioxide and a preparation method of the Pt-ZnO / In2O3 catalyst, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: preparing a ZnO / In2O3 catalyst by using a coprecipitation method; and loading platinum on the surface of the ZnO / In2O3 catalyst by an impregnation method to obtain the Pt-ZnO / In2O3 catalyst. The Pt-ZnO / In2O3 catalyst does not generate a sintering phenomenon in the use process, has long-term stability, realizes modification of the In2O3-based catalyst by adding zinc oxide, and can significantly improve the conversion rate of carbon dioxide and product selectivity.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

The invention discloses a method for synthesizing a Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst by adopting a solvothermal method, and belongs to the technical field of catalysts. The preparation method comprises the following steps: preparing copper molybdenum sulfide by using cuprous oxide as a template, synthesizing copper molybdenum sulfide with high purity and good crystallinity by combining a solvothermal method, preparing manganese cadmium sulfide by using manganese acetate, cadmium acetate, sodium hydroxide and thioacetamide as raw materials, adding copper molybdenum sulfide before a hydrothermal reaction, successfully modifying the manganese cadmium sulfide by constructing a heterojunction, and preparing the copper molybdenum sulfide modified manganese cadmium sulfide. The Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst is synthesized, and the photocatalytic hydrogen production rate of the cadmium manganese sulfide is improved. Moreover, the hydrogen production rate of the Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst prepared by the invention can reach 8233 mu mol / (g.h), which is 2.08 times of the hydrogen production rate of pure cadmium manganese sulfide, and 1.24 times of the hydrogen production rate of cadmium manganese sulfide loaded with 1% platinum.

The invention relates to the technical field of catalysis, and particularly discloses a hydroisomerization catalyst as well as a preparation method and application thereof. The hydroisomerization catalyst is prepared from the following components in parts by weight: 97.5 to 99.4 parts of molecular sieve carrier and 0.5 to 1.5 parts of oxide containing active metal, 0.1 to 1.0 part of an oxide of a metal containing an auxiliary agent; the molecular sieve carrier is synthesized by adopting a double-template agent; in the oxide containing the active metal, the active metal is selected from one or more of a platinum-palladium combination, a molybdenum-tungsten combination and a nickel-cobalt combination; in the oxide containing the additive metal, the additive metal is cerium; the preparation method comprises the following steps: co-impregnating the molecular sieve carrier with a salt solution containing the active metal and the additive metal, drying, and performing hydrogen reduction to obtain the hydroisomerization catalyst. When the hydroisomerization catalysis is applied, the conversion rate, the selectivity and the water-oxygen tolerance are synergistically considered and improved, and the overall application effect and the service life are remarkably improved.

The present invention relates to the field of catalyst technology, discloses a supported noble metal catalyst and its preparation method and application, the catalyst includes a first carrier and a coating loaded on the first carrier, the raw material composition for preparing the coating includes a second carrier, an active component precursor, an auxiliary agent precursor, a binder and a dispersant; the first carrier is cordierite, mullite or cordierite-mullite; the second carrier is titanium dioxide and / or aluminum oxide; the active component precursor is selected from at least one of a platinum precursor, a palladium precursor and a rhodium precursor; the auxiliary agent precursor is a combination of a cerium precursor, a zirconium precursor and a neodymium precursor; the binder is a mixture of an organic binder, an inorganic binder and a coupling agent. The supported noble metal catalyst has low production cost, high catalytic activity, strong anti-poisoning ability and long service life, can be used for the removal of volatile organic compounds, and is particularly suitable for the removal of flue gases such as ethylene and propane with large air volume and low concentration of organic small molecule hydrocarbons.

A crosslinked rubber article according to the present disclosure contains a crosslinked product of a fluorine-containing copolymer. When the crosslinked rubber article is subjected to a sputtering treatment by a method of test 1, the arithmetic average height Sa of the surface of the crosslinked rubber article after the sputtering treatment is greater than 1.6 μm, and the aspect ratio Str of the surface of the crosslinked rubber article after the sputtering treatment is 0.90 or less. Test 1: A crosslinked rubber article is placed on a sample table of an ion sputtering apparatus, and a distance between a placement surface of the crosslinked rubber article in the sample table and a target made of platinum is set to 35 mm. Then, the crosslinked rubber article is subjected to a sputtering treatment by setting the degree of vacuum in a sample chamber of the ion sputtering apparatus to 6 kPa and then performing discharge for 30 sec at a target additional current value of 25 mA.

The invention discloses a water quality monitoring device and a monitoring method thereof, belongs to the technical field of water quality monitoring, and solves the problems that trace hydrogen sulfide generated by sulfate reducing bacteria in a deposited layer at the bottom of a water tank which is not cleaned for a long time in a low-oxygen environment reacts with a platinum membrane electrode of a residual chlorine sensor to generate a platinum sulfide covering layer; and the electrode reading is continuously virtually high and drifts slowly. Comprising an optical transmitting module, an optical receiving module, a spectrum separation module, a signal conditioning module, a lock-in amplification module, a spectrum feature extraction module and a hydrogen sulfide recognition engine. Residual chlorine is monitored in a non-contact mode, deep ultraviolet pulse light is emitted to penetrate through a water body, a reflection spectrum is received, second derivative spectral characteristics are extracted through multichannel signal processing, and multivariable regression compensation is executed to calculate a real residual chlorine value after hydrogen sulfide interference characteristics are recognized. Meanwhile, the drift trend is quantified based on the double-time-constant integral, graded early warning is triggered, industrial standard signals are finally output, and the problem of electrode contact pollution is avoided in the whole process.

The invention discloses a high-performance conductive adhesive doped with conductive nanoparticles, and belongs to the technical field of conductive adhesives. The high-performance conductive adhesive provided by the invention is prepared from the following raw materials in parts by weight: 50 to 100 parts of vinyl liquid silicone rubber, 100 to 400 parts of modified silver coated copper powder, 1 to 10 parts of nano silver powder I, 1 to 10 parts of epoxy silane modified prepolymer, 3 to 30 parts of hydrogen-containing silicone oil, 0.1 to 5 parts of platinum catalyst and 0.05 to 1 part of inhibitor. The silver-coated copper powder and the epoxy silane are modified, so that the conductivity and the binding power of the conductive adhesive are greatly improved, and the epoxy silane modified prepolymer can form strong covalent bond combination with the surface of an adhered object through a high-density epoxy group of the epoxy silane modified prepolymer; the nano-silver bulges on the surface of the modified silver coated copper powder increase the effective contact area and the number of contact points among the conductive filler particles, so that the conductive adhesive has the characteristics of high conductivity, low resistance, high adhesive strength and strong toughness.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention relates to a platinum-free high-entropy alloy material as well as a preparation method and application thereof. The preparation method of the platinum-element-free high-entropy alloy material comprises the following steps that nitrate of Fe, nitrate of Co, nitrate of Ni, nitrate of Cr and nitrate of Cu are weighed according to the molar ratio of 40: 15: 15: 15: 15, and the nitrate of Fe, the nitrate of Co, the nitrate of Ni, the nitrate of Cr and the nitrate of Cu are dispersed in an ethanol solution; adding carbon powder into the solution, and evaporating moisture to dryness through a solvothermal reaction method to obtain precursor powder; wrapping the precursor powder with graphite paper, and then carrying out Joule heat treatment, wherein the heating temperature is 1400-1650 DEG C; and washing the obtained material with ethanol for more than two times, and drying in a protective atmosphere to obtain the high-entropy alloy material. According to the invention, uniform distribution of multiple metal elements is realized, and the synergistic effect among metals is effectively regulated, so that the catalytic activity and stability of the material are remarkably improved.

The invention discloses a comprehensive treatment method of platinum and palladium slag, and relates to the technical field of non-ferrous metal metallurgy. After the platinum and palladium slag is subjected to sulfating roasting, flue gas is introduced into a selenium absorption tower; hydrolyzing the roasting slag, reducing the dissolving solution to recover tellurium, and enabling the dissolving solution to enter a copper recovery process after tellurium precipitation; the dissolving slag is subjected to chlorination dissolution gold separation, and the gold separation slag is subjected to silver recovery; the gold separation liquid is reduced to obtain gold powder; carrying out platinum and palladium precipitation on the gold reduced solution, adding ammonia water into platinum and palladium precipitation to carry out platinum and palladium separation, respectively refining the separated platinum and palladium, and recovering platinum and palladium; carrying out platinum-palladium reduction on the platinum-palladium precipitation post-solution to obtain platinum-palladium precipitation slag and a platinum-palladium reduction post-solution, and returning the platinum-palladium precipitation slag to the roasting process; and performing tellurium reduction on the platinum-palladium reduced liquid to obtain tellurium powder and tellurium reduced liquid, and enabling the tellurium reduced liquid to enter a wastewater treatment process. The method has the beneficial effects that selenium, tellurium, copper, gold, silver, platinum and palladium are separated and recycled step by step, the recycling rate is high, the wastewater treatment difficulty is small, and environmental pollution is reduced.

The invention relates to a technology for obtaining high-strength, high-toughness and high-hardness platinum by means of component regulation and control and controlled cooling, and belongs to the technical field of metal materials. The required high-strength, high-toughness and high-hardness platinum sheet, bar or wire is finally prepared through alloy smelting, component regulation and control, ordered oscillation, temperature-controlled precipitation and hot and cold machining. According to the method, component regulation and control and heat treatment control are carried out in the platinum smelting process, so that an ordered submicron-order alternately-distributed two-phase strengthening phase with superfine interlayer spacing is formed in a microstructure of the material, the purpose of synchronously improving the strength, toughness and hardness of platinum is achieved, and it can be guaranteed that the purity of platinum is 99.9% or above.

A method may include operating a dehydrogenation process whereby a hydrocarbon-containing feed is converted to light olefins, wherein the dehydrogenation process utilizes a fluidized process catalyst that circulates between a reactor and a combustor. The method may comprise withdrawing the process catalyst from the dehydrogenation process, modifying the process catalyst to form a modified catalyst, and adding the modified catalyst back to the dehydrogenation process. The process catalyst may include from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium, or combinations thereof, from 1 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, and at least 85 wt. % support. Modifying the process catalyst may include adding one or more of manganese, iron, chromium, or vanadium.

The invention belongs to the technical field of supported catalysts, and particularly discloses a modified hydrogenation catalyst and a preparation method thereof. The modified hydrogenation catalyst is prepared from the following raw materials in percentage by mass: 60 to 70 weight percent of pretreated molecular sieve carrier, 0.5 to 1 weight percent of active metal component platinum and 20 to 40 weight percent of montmorillonite bonding composition. Various raw materials are mixed, so that the catalyst has a relatively large specific surface area and relatively good thermal stability, the structure can be kept stable under a high-temperature reaction condition, the high-temperature stability of the catalyst is enhanced, and the service life of the catalyst is prolonged.

The invention discloses a hydrogen energy fuel cell catalyst carrier based on a graphene graft polymer, which is characterized in that two-dimensional graphene is used as a substrate, the surface of the two-dimensional graphene is modified with an oxygen-containing functional group, and a functional polymer branch chain containing nitrogen, sulfur or phosphorus heteroatoms is covalently grafted to form a local three-dimensional network winding structure; the carrier is loaded with platinum, palladium, ruthenium and other metal or alloy nanoparticles, the particle size is 2-8 nm, the loading capacity is 10%-40%, and the particles are anchored to polymer functional sites or reduced in situ to a graphene defect area through coordination. A polymer branch chain has pH responsiveness and can adjust the local proton transmission efficiency; the grafting density is 3-15 grafting points per 100 carbon atoms, so that high dispersion and stable anchoring of metal particles are effectively realized; the specific surface area of the carrier is 400-800m < 2 > / g, the electrochemical active area is not less than 80m < 2 > / g, and the activity retention rate is greater than 80% after 5000 circles of accelerated durability tests. The activity, the stability and the proton conduction performance of the catalyst are remarkably improved, and the catalyst is suitable for high-performance fuel cells.

The invention discloses an amorphous PtNi self-supporting catalytic electrode, a preparation method thereof and a direct ammonia fuel cell, and belongs to the technical field of electrode materials. According to the technical scheme, the catalytic electrode adopts foamed nickel as a conductive framework substrate, and an amorphous PtNi alloy wall-shaped array structure grows on the foamed nickel in situ; the preparation method of the catalytic electrode comprises the following steps: pretreating the foamed nickel substrate; the preparation method comprises the following steps: adding platinum diacetylacetonate, potassium hydroxide, N, N-dimethylformamide and diethylenetriamine into ethylene glycol to prepare a precursor solution; and immersing foamed nickel into the precursor solution, and carrying out in-situ growth reaction under high-temperature and high-pressure conditions to obtain the amorphous PtNi self-supporting catalytic electrode. The catalytic electrode has the beneficial effects that the catalytic electrode shows high specific activity and extremely low apparent activation energy in ammoxidation reaction, still keeps 90% of current density after continuously working for 1000 hours, and shows excellent long-term stability and durability.

The present invention discloses a novel gas-sensitive material, specifically a method for preparing a core-shell nanofiber gas-sensitive material based on a platinum-doped cobalt oxide / tin oxide heterostructure. The present invention utilizes a cobalt source, a tin source, a platinum source, and a polymer as raw materials, and produces a nanoscale platinum-doped cobalt oxide / tin oxide gas-sensitive material with high sensitivity and rapid response to hydrogen sulfide gas via coaxial electrospinning. This gas-sensitive material exhibits excellent gas-sensing properties for H2S gas at room temperature, with a short response time, enabling rapid detection of low-concentration H2S gas, a short recovery time, and excellent cyclic stability. Therefore, the gas-sensitive material of the present invention possesses excellent sensitivity and stability, and has broad application prospects, including applications in environmental monitoring, industrial safety, and gas sensors.

The invention relates to the technical field of biological aviation kerosene, and discloses a process for preparing biological aviation kerosene from waste grease. The method comprises the following steps: introducing waste oil into a hydrofining reactor, introducing hydrogen, carrying out a hydrodeoxygenation reaction under the catalysis of a hydrogenation catalyst, carrying out a reaction on the obtained hydrodeoxygenated oil in an isomerization pour point depressing reactor, and finally carrying out isomerization hot high-pressure separation treatment, isomerization cold high-pressure separation treatment and rectification tower segmentation to obtain the biological aviation kerosene. The specific surface area of a carbon matrix of the hydrogenation catalyst is large, the void structure is rich, a large number of Ni-Mo-P active catalytic centers can be exposed, precious metals such as platinum and ruthenium do not need to be added, the hydrodeoxygenation reaction efficiency of waste oil and fat is remarkably improved, the mass fraction of branched paraffin and cycloparaffin in biological aviation fuel is high, and the combustion performance is better.

The invention discloses an anode porous transmission layer for PEM water electrolysis hydrogen production and a preparation method of the anode porous transmission layer. The preparation method comprises the steps that firstly, a porous titanium plate and a titanium mesh are washed and dried after being subjected to acid pickling; secondly, absolute ethyl alcohol, polyvinyl butyral and titanium powder are evenly mixed to be prepared into slurry, and the slurry is sprayed to the two sides of the dried titanium mesh; and 3, stacking the porous titanium plate and the titanium mesh sprayed with the slurry, and forming metallurgical bonding through vacuum diffusion welding to obtain the anode porous transmission layer. The porous titanium plate and the titanium mesh are metallurgically bonded to prepare the anode porous transmission layer, the platinum plating amount is effectively reduced and the catalyst utilization rate is improved by regulating and controlling the thickness and the pore structure of the porous titanium plate and the plate-mesh stacking mode, and the gas-liquid transmission efficiency of the anode porous transmission layer is improved; and the anode porous transmission layer with strong mechanical support and high gas-liquid transmission efficiency is obtained, is suitable for PEM water electrolysis hydrogen production, and meets the development requirements of high efficiency and low cost of hydrogen production through renewable energy source and PEM water electrolysis coupling.

The invention relates to a method for recovering platinum in nickel-platinum waste. The method comprises the steps of hot nitric acid dissolution, filtration, pH adjustment, selective precipitation and drying. The characteristic that hot nitric acid can completely dissolve Ni and partially dissolve Pt is utilized to achieve preliminary separation of NiPt, sodium sulfide is used as a precipitator, selective precipitation of platinum is achieved through the Ksp difference of platinum sulfide and base metal sulfide within the pH range of 1-2, the recovery rate of platinum is greatly increased, and energy consumption of the platinum recovery process is reduced. Emission of a large amount of volatile acid is avoided while economic benefits are improved, and the method is more suitable for actual production.

According to the microwave reactor and method for recycling the three-way catalytic precious metal, through the synergistic effect of microwave radiation and the telescopic glass stirring rod, the problem that the mass transfer efficiency is low due to high viscosity of a traditional ionic liquid leaching system is solved, the precious metal leaching time is shortened, and the efficiency is improved. Meanwhile, a diamond ATR crystal infrared probe is adopted to monitor components of a reaction solution in real time, multi-parameter linkage control of microwave power, temperature and stirring rate is combined, reaction conditions are dynamically optimized, and the recovery rate of platinum, palladium and rhodium is increased. The method systematically solves the technical bottlenecks of high energy consumption, heavy pollution and low ionic liquid leaching efficiency of the traditional pyrogenic process / wet process, and provides an innovative scheme with high efficiency, low environmental load and industrial feasibility for precious metal recovery.

The invention relates to the field of preparation of nano materials, in particular to a preparation method of a metal-oxide cluster electro-catalytic material based on an ammonia-mediated electrostatic adsorption principle, and aims to solve the problem that a metal-oxide cluster heterogeneous interface is difficult to accurately construct by an existing method. The preparation method comprises the following steps: dispersing a carbon carrier, a soluble inorganic compound containing platinum, ruthenium and rhodium, a soluble metal complex anion salt and dopamine hydrochloride in a water-alcohol mixed solution, adding ammonia water, and preparing a metal-oxide heterogeneous cluster precursor through an ammonia-mediated electrostatic adsorption effect; and pyrolyzing the precursor in a reducing atmosphere to prepare the metal-oxide cluster electro-catalytic material. The prepared electro-catalytic material has a definite heterogeneous cluster interface and has excellent performance in alkaline hydroxide reaction. The method is simple and convenient to operate, low in cost and low in energy consumption, can be popularized to various metal-oxide cluster electro-catalytic materials, and has application potential.