2829 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.

A solid electrolyte includes: LiaAbEc(SO4)dJeXfHh, A is selected from alkaline earth metals and alkali metals other than Li, E is selected from Al, Ga, In, Sc, Y, Ti, Zr, Hf, and lanthanides, J is selected from OH, BO2, BO3, BO4, B3O6, B4O7, CO3, NO3, AlO2, SiO3, SiO4, Si2O7, Si3O9, Si4O11, Si6O18, PO3, PO4, P2O7, P3O10, SO3, SO5, S2O3, S2O4, S2O5, S2O6, S2O7, S2O8, BF4, PF6, BOB, (COO)2, N, AlCl4, CF3SO3, CH3COO, CF3COO, OOC—(CH2)2—COO, OOC—CH2—COO, OOC—CH(OH)—CH(OH)—COO, OOC—CH(OH)—CH2—COO, C6H5SO3, OOC—CH═CH—COO, OOC—CH═CH—COO, C(OH)(CH2COOH)2COO, AsO4, BiO4, CrO4, MnO4, PtF6, PtCl6, PtBr6, PtI6, SbO4, SeO4, TeO4, HCOO, and O, X is selected from F, Cl, Br, and I, 0.5≤a<6, 0≤b<6,0<c<2,0.1<d≤6.0, 0<e≤6.0, 0<f≤6.1, and 0≤h≤0.2, and a peak is observed at a diffraction angle 2θ=22.3°±1.0° in an X-ray diffraction pattern in which Cu-Kα is used as a line source.

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.

The invention belongs to the technical field of electro-catalysis and energy conversion, and provides a carbon skeleton loaded platinum monatomic-cobalt nanoparticle catalyst, a preparation method thereof and application in electro-catalysis hydrogen evolution, a ZIF-67-ZIF-8 precursor is prepared in an epitaxial growth mode, and the precursor is pyrolyzed to construct a carbon matrix containing cobalt nanoparticles; in the preparation process of ZIF-67-ZIF-8, the treatment duration of tannic acid is regulated and controlled, and the size of cobalt nanoparticles is accurately controlled; meanwhile, uniform N holes generated in the high-temperature pyrolysis process are beneficial to precise range limitation of PtN bonds, and finally the carbon skeleton loaded platinum monatomic-cobalt nanoparticle catalyst is constructed. The concentration of local protons around platinum sites is enriched through cobalt, and therefore adsorption of protons on platinum single atoms and generation of hydrogen are remarkably promoted. Due to the display of the bifunctional catalytic effect, the overall catalytic efficiency of the alkaline hydrogen evolution reaction is effectively improved. The catalyst shows excellent catalytic performance in alkaline hydrogen evolution reaction, and is expected to be widely applied to the water electrolysis hydrogen production technology.

The invention provides ceramic silicone rubber as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The ceramic silicone rubber provided by the invention is prepared from the following preparation raw materials in parts by mass: 90-105 parts of methyl vinyl silicone rubber; 35 to 45 parts of fumed silica; 3-10 parts of hydroxyl silicone oil; 0.1 to 8 parts of a silane coupling agent; 1-75 parts of an inorganic filler; the inorganic filler is mica powder, montmorillonite and wollastonite; 10-30 parts of low-melting-point glass powder, the melting point of the low-melting-point glass powder is 400-600 DEG C, and the low-melting-point glass powder is borate glass powder and / or phosphate glass powder; 0.1 to 0.3 part of platinum flame retardant; 0.5 to 1.5 parts of a vulcanizing agent; and 0.1-0.5 part of an internal release agent. The ceramic silicone rubber provided by the invention can maintain higher tensile strength and elongation at break on the basis of ensuring better ceramic performance.

The invention belongs to the technical field of metal material preparation, and particularly relates to a high-purity platinum-molybdenum thermocouple wire and a preparation method and application thereof. The preparation method of the high-purity platinum-molybdenum thermocouple wire comprises the following steps: (1) purifying crude platinum step by step to obtain high-purity sponge platinum with the purity not lower than 99.999%; (2) mixing the high-purity platinum powder and the high-purity molybdenum powder according to a formula proportion, and performing cold isostatic pressing to obtain an alloy ingot; (3) the alloy ingot is subjected to vacuum suspension smelting, gas and non-metallic inclusions are removed, and a high-purity, uniform and compact platinum-molybdenum alloy cast ingot is obtained; (4) carrying out sheathing, hot forging and surface milling on the cast ingot to obtain a thermo wire bar; and (5) the bar is subjected to cold rolling, cold drawing and argon shield annealing, and the high-purity platinum-molybdenum thermocouple wire is prepared. The platinum-molybdenum thermocouple wire prepared by the method has the characteristics of high purity, accurate content, stable thermoelectric force, irradiation resistance, long service life and the like, and can meet the performance requirement of accurate temperature measurement in a core irradiation environment in the nuclear power engineering field.

The invention belongs to the technical field of catalyst preparation, focuses on a high-entropy alloy nanowire catalyst, and mainly relates to a preparation method and application of an AuCuAgPtNi catalyst. A one-pot wet chemical method is innovatively adopted, a 4-aminopyridine solvent and metal precursors of gold, copper, silver, platinum and nickel are fully and evenly mixed and placed in an oil bath pot at the temperature of 90 DEG C, then a reducing agent ascorbic acid is rapidly added, after specific reaction time, washing, drying and other operations are sequentially carried out, and the high-entropy alloy nanowire AuCuAgPtNi catalyst can be successfully prepared. The preparation method disclosed by the invention has the remarkable advantages of simple process, simple steps, convenience in operation and the like. In an alkaline environment, the prepared nanowire-shaped high-entropy alloy AuCuAgPtNi catalyst shows extremely excellent catalytic activity and selectivity for catalytic degradation of waste plastic polylactic acid, the waste plastic can be efficiently upgraded and converted into pyruvic acid, a new way is opened up for resource utilization of the waste plastic, and the application prospect is wide. The method has a wide application prospect in the fields of environmental protection and resource recovery.

A working wire for a biological sensor is disclosed. The working wire includes a substrate comprising cobalt-chromium (Co—Cr) alloy or Nitinol alloy, a platinum layer comprising platinum on the substrate, and a membrane layer comprising a biological membrane applied over the platinum layer.

The invention relates to flower-like FeCoNiMnPt high-entropy magnetic alloy powder and a preparation method of the flower-like FeCoNiMnPt high-entropy magnetic alloy powder. According to the technical scheme, the preparation method comprises the following steps: respectively dissolving ferric acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate, manganese acetylacetonate and platinum acetylacetonate in oleylamine at equal concentration, and carrying out ultrasonic dispersion to obtain a solution A; respectively dissolving octadecyl trimethyl ammonium bromide and glucose in the solution A at equal concentration, carrying out ultrasonic dispersion, adding the obtained solution B into a sealed container, putting the sealed container into a high-pressure reaction kettle, putting the high-pressure reaction kettle into a hydrothermal oven, carrying out heat preservation and cooling, and taking out the sealed container; the obtained solution C is subjected to centrifugal treatment, washing, drying and cooling, and magnetic alloy powder is obtained; and placing the crucible filled with the magnetic alloy powder in a tubular atmosphere furnace, preserving heat at 450-650 DEG C, and cooling to obtain the flower-like FeCoNiMnPt high-entropy magnetic alloy powder. The preparation method is simple in process, low in cost and high in production efficiency, and the prepared product is large in specific surface area and high in saturation magnetization.

The invention discloses a low-cost hydrogen embrittlement-resistant titanium bipolar plate for an electrolytic bath and a preparation method of the low-cost hydrogen embrittlement-resistant titanium bipolar plate. The low-cost hydrogen embrittlement-resistant titanium bipolar plate comprises a surface-modified titanium base material, an in-situ hydrogen-resistant layer formed on the surface of the titanium base material, and a noble metal conductive layer prepared on the surface of the in-situ hydrogen-resistant layer, the surface roughness Ra value of the titanium base material subjected to surface modification is 2-3.5 microns; the in-situ hydrogen-resistant layer is a titanium oxide layer or an oxygen inclusion layer which is generated on the surface of the titanium substrate in situ in an air atmosphere or an oxygen-enriched atmosphere, and the thickness of the in-situ hydrogen-resistant layer is 50-200nm; the precious metal conducting layer is made of at least one of platinum, gold, iridium and palladium, and the thickness of the precious metal conducting layer is 20-150 nm. Through simple surface modification and in-situ generation of the hydrogen-resistant layer, the method has the advantages of high process maturity, low process complexity, low material cost and great cost advantage.

The invention belongs to the field of catalyst regeneration, and provides a regeneration method of a platinum-based low-carbon alkane dehydrogenation catalyst, which specifically comprises the following steps of: simultaneously carrying out charking and oxychlorination operations before a deactivated catalyst reaches the highest roasting temperature, and adding agent pouring treatment in the regeneration process, and measures for protecting the dispersity of platinum on the catalyst are added in the reaction heating process of the catalyst and after the application is finished, so that the service life of the catalyst is prolonged. According to the regeneration method, the regeneration step of the deactivated catalyst is simplified, chlorine injection, water injection, vulcanization and other operations are not needed, charking, oxychlorination and different reduction depths caused by different positions of the catalyst are avoided, the performance uniformity of the catalyst and the redispersity of platinum are improved, and the regeneration efficiency is improved. The problems that in an existing regeneration method, the dispersity of active components is low, the number of repeated regeneration times is small, and the performance of the catalyst is reduced are solved, the regenerated catalyst obtained through the regeneration method is not lower than that of a fresh catalyst in the aspects of catalyst conversion rate, selectivity and stability, and the regeneration effect is remarkable.

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 provides a preparation method and application of a catalyst for methane normal hexane co-aromatization, a simple in-situ hydrothermal synthesis method is adopted, platinum and nickel are dispersed in a ZSM-5 molecular sieve, and a metal packaging type NiPt-coated ZSM-5 catalyst is synthesized. When the catalyst is applied to methane and normal hexane co-aromatization reaction, the catalyst shows relatively high methane conversion rate and aromatic hydrocarbon selectivity. The molecular sieve packaging mode not only can improve the dispersity of the active component so as to improve the capability of activating methane, but also can improve the high-temperature stability of the active component and prolong the service life of the catalyst, and can effectively solve the problems of high reaction temperature and poor catalyst stability in the existing methane aromatization technology. And the method has a good practical application prospect.

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.

A fast response platinum resistor temperature sensor comprises a sensor housing, a measuring end of the sensor housing is provided with a sensor element, the sensor element comprises a ceramic cylinder, a front end of the ceramic cylinder is provided with packaging ceramic, the packaging ceramic is provided with a plurality of through holes, a rear end of the ceramic cylinder is provided with heat conduction ceramic, and the heat conduction ceramic is provided with a plurality of through holes. A temperature measuring platinum wire is arranged at the upper end of the interior of the ceramic cylinder and connected with a platinum resistor lead, a thermoelectric material wire is arranged at the lower end of the interior of the ceramic cylinder, the front end of the thermoelectric material wire is welded with a leading-out wire to form a second hot junction, and the rear end of the thermoelectric material wire is welded with another leading-out wire to form a first hot junction. The lead-out wire penetrates through a through hole in the packaging ceramic, the platinum resistor lead is connected with a platinum resistor signal lead arranged in the sensor shell, the lead-out wire is connected with a thermoelectric material wire signal lead, the platinum resistor signal lead and the thermoelectric material wire signal lead are fixedly connected with a sensor junction box, and the sensor shell is filled with an insulating material.

The invention belongs to the technical field of metal surface treatment, and relates to a preparation method of a metal surface lattice passivation corrosion-resistant film, which comprises the following steps of: polishing and cleaning a metal surface, constructing a three-electrode system, and applying cathode voltage to the metal to carry out surface modification treatment so as to realize metal surface lattice reconstruction, thereby obtaining the metal surface lattice passivation corrosion-resistant film. A compact adsorption layer of corrosion inhibition molecules is formed; the three-electrode system comprises metal as a working electrode, a platinum sheet as an auxiliary electrode and silver / silver chloride or saturated calomel as a reference electrode. According to the method, metal surface lattice reconstruction is achieved through cathode voltage treatment, the technical thought of traditional anodic oxidation is subverted, the passive film forms a regular lattice structure, defects in the film are greatly reduced, permeation of a corrosion medium is effectively blocked, and the corrosion resistance of metal is remarkably improved.

The invention relates to the technical field of fuel cells, and mainly relates to a carbon-supported metal catalyst and a preparation method thereof. The preparation method comprises the following steps: dispersing platinum acetylacetonate, acetylacetone salt of transition metal and a carbon material in a solvent, drying to remove the solvent to obtain a precursor, and annealing for the first time in an air atmosphere to obtain a mixture; annealing the mixture for the second time in a hydrogen-argon atmosphere, cooling, pickling, washing, drying, and annealing for the third time in the hydrogen-argon atmosphere to obtain the carbon-loaded metal catalyst. According to the preparation method, platinum and acetylacetone salt of transition metal are used, after uniform dipping, annealing is directly carried out in the air atmosphere, two-step gas phase reduction is carried out in the hydrogen argon atmosphere, the platinum-based intermetallic compound nano-particles wrapped by the adjustable carbon layer are prepared, particle aggregation is effectively prevented, the prepared catalyst is high in order degree, and the catalyst has good catalytic activity. And the particles are fine and uniformly distributed and have excellent activity.

The invention discloses a platinum-tungsten bimetallic catalyst for PET depolymerization and a method for directional depolymerization of PET by the platinum-tungsten bimetallic catalyst, and belongs to the technical field of solid waste recycling, the platinum-tungsten bimetallic catalyst for PET depolymerization is prepared by a deposition-precipitation method, a mesoporous molecular sieve MCM-48 is used as a carrier to load platinum-tungsten bimetallic, the molar ratio of platinum to tungsten is 1: (0.5-2), the molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48, and the mesoporous molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48 carrier. And the platinum loading capacity is 4-6 wt%. By utilizing the platinum-tungsten bimetallic catalyst, one-pot depolymerization of PET can be realized to prepare p-toluic acid and p-xylene, the platinum-tungsten bimetallic catalyst can be used for multiple times through reduction regeneration, the catalytic activity is high, and the PET depolymerization method under catalysis of the platinum-tungsten bimetallic catalyst is suitable for recycling and upgrading of PET wastes in various forms and has wide application prospects. The technical problems of efficient depolymerization and directional conversion of the waste PET are solved, and a sustainable technical path is provided for resource recycling of the PET.

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 discloses a microwave-assisted green micro-nano platinum powder preparation method and application thereof. The method comprises the following steps: a) preparing a platinum ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying: drying the product at low temperature to obtain the micro-nano platinum powder. Through microwave field enhanced mass transfer and nucleation kinetics, compared with a traditional chemical reduction method, the reaction efficiency is improved by 80% or above, high-temperature and high-pressure conditions are not needed, and the process energy consumption is reduced by about 60%. The obtained platinum nano-powder is excellent in dispersity, the specific surface area reaches 20-50 m < 2 > / g, and the platinum nano-powder shows high activity in a proton exchange membrane fuel cell catalyst. The method is suitable for continuous production, and an efficient solution is provided for application of the high-performance platinum-based material in the fields of catalysis, new energy and electronic devices.

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 invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention discloses an electro-synthesis method of alpha-aminomethyl tetrazole, which comprises the following steps: by taking a platinum sheet as a cathode, a carbon rod as an anode and tetrabutylammonium tetrafluoroborate as an electrolyte under the catalysis of constant current, coupling tertiary amine, isonitrile and azido trimethylsilane by a one-pot method to prepare an alpha-aminomethyl tetrazole derivative, and carrying out post-treatment on the obtained reaction mixed solution, and carrying out column chromatography separation to obtain a pure alpha-aminomethyl tetrazole product. The alpha-aminomethyl tetrazole can be obtained only through one-step reaction, the operation steps are few, a large number of oxidizing agents and additives are not used, the post-treatment process is simple, and the product is easy to separate.

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.

A sensor comprising one or more metal oxides as sensor material is used to detect pathogen-derived VOCs, such as those released from an infected wound. The metal oxides can comprise one or more metal elements selected from aluminum, antimony, bismuth, boron, cerium, chromium, cobalt, copper, gold, indium, iridium, iron, lanthanum, lead, manganese, molybdenum, nickel, niobium, osmium, palladium, platinum, rhodium, ruthenium, selenium, silicon, silver, tantalum, tellurium, terbium, tin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, and zirconium. The sensor device can have one or more sensors that detect and record various VOCs indicative of the presence of pathogens, which are associated with mortality and / or infection.