1546 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 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.

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 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.

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 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 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 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.

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.

Compositions of particles having at least 95% by weight of cisplatin and a specific surface area (SSA) of at least 3.5 m2 / g. methods for their use. and methods for their production are provided.

The invention belongs to the field of catalyst preparation, and particularly relates to a platinum-based bimetallic propane dehydrogenation catalyst and a preparation method thereof. The method comprises the following steps: firstly, weighing beta molecular sieve powder, adding into a concentrated nitric acid solution, stirring and refluxing at high temperature, centrifugally washing, and drying to obtain a dealuminated beta molecular sieve; then calcining the metal additive oxide powder and the dealuminated beta molecular sieve in a reducing atmosphere to obtain composite beta molecular sieve powder; then weighing platinum precursor salt, dissolving the platinum precursor salt in ultrapure water to form a solution, and then adding ethylenediamine for coordination; and finally, impregnating the composite beta molecular sieve with a platinum precursor solution, and carrying out aging, drying and high-temperature treatment to obtain the dealumination beta molecular sieve loaded platinum-based bimetallic catalyst. According to the method provided by the invention, the metal is spontaneously and highly dispersed on the carrier by utilizing the capturing effect of the beta molecular sieve silanol nest on the metal and combining the dynamic migration behavior of the metal under high-temperature reduction. The prepared catalyst shows extremely high propane conversion activity and selectivity at 600 DEG C, and is excellent in stability.

The invention discloses a non-noble metal ORR catalyst and a preparation method thereof, and belongs to the technical field of electro-catalysis. The method comprises the following steps: (1) adding 5, 10, 15, 20-tetra (4-cyanophenyl) porphyrin and nickel salt into an organic solvent, and synthesizing a supramolecular crystal precursor UPC-S7 through solvothermal reaction; (2) carbonizing the supramolecular crystal precursor UPC-S7 in an inert atmosphere to obtain a Ni-coated NC material; (3) oxidizing the Ni-coated NC material in an oxygen-containing atmosphere to obtain a Ni / NiO-coated NC material; and (4) sequentially soaking and etching the Ni / NiO-coated NC material by using a nitric acid solution and an ammonia water solution, and then washing and drying to obtain the non-noble metal ORR catalyst. The prepared catalyst does not contain precious metal such as platinum, the raw material cost is remarkably reduced on the basis of ensuring the ORR activity and stability of the catalyst, and a new scheme is provided for solving the cost bottleneck of a fuel cell.

A method may include contacting a hydrocarbon-containing feed with a catalyst in a reactor to form an olefin-containing effluent, then at least partially separating the olefin-containing effluent from the catalyst. Passing the catalyst to a combustor and heating the catalyst by combusting a supplemental fuel. The supplemental fuel includes methane in an amount greater than or equal to 1 mol. %. Passing the catalyst from the combustor to the reactor, such that at least a portion of the catalyst continuously cycles between the reactor and the combustor. The catalyst includes from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium or combinations thereof, from 5 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, from 100 ppmw to 30000 ppmw of chromium, and at least 85 wt. % support.

The invention discloses a method for preparing a tungsten trioxide low-platinum electrocatalyst with a core-shell structure through pulse Joule heating, and belongs to the field of electrochemical catalysts for electrolysis of water. The invention aims to solve the problems that controllable amorphization is difficult to realize on the WO3 surface and a crystal nucleus-amorphous shell composite structure cannot be effectively constructed in the prior art. The preparation method comprises the following steps: 1, preparing a tungsten trioxide carrier with a core-shell structure; and 2, loading a platinum source. The method is used for preparing the tungsten trioxide low-platinum electrocatalyst with the core-shell structure through pulse Joule heating.

The invention relates to the field of suspension plasma spraying, in particular to a long-service-life suspension plasma spraying thermal barrier coating based on a platinum-aluminum coating and a preparation method of the long-service-life suspension plasma spraying thermal barrier coating. The preparation method comprises the following steps: preparing a vertical crack or columnar-like structure ceramic layer on the surface of a platinum modified aluminide bonding layer with lower roughness by using suspension slurry prepared from fully-stable tetragonal phase yttrium oxide stabilized zirconium oxide powder and adopting suspension plasma spraying suspension, so as to obtain a thermal barrier coating system with long service life. The problems that in the prior art, due to stress existing between a ceramic layer prepared through plasma spraying and a low-roughness platinum modified aluminide bonding layer, cracks are continuously formed and expanded at an interface, and the service life of a thermal barrier coating system is short are solved. The long-life thermal barrier coating system can be prepared on the platinum modified aluminide bonding layer through suspension plasma spraying.

The invention belongs to the field of petrochemical engineering, and discloses a bimetallic Ni-Pt / RFE hydroisomerization catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a nickel precursor in water, stirring until clarification, and dropwise adding ammonia water to obtain a mixed solution 1; rFE is added into the mixed solution 1, the pH value is adjusted to be 9-11.5, suction filtration, washing and drying are conducted after stirring, and Ni / RFE is obtained; dissolving a platinum precursor in water, stirring until the solution is clear, and dropwise adding ammonia water to obtain a mixed solution 2; and adding the Ni / RFE into the mixed solution 2, adjusting the pH value to 9-11.5, stirring, and carrying out suction filtration, washing, drying and roasting to obtain the Ni-Pt / RFE. The method is simple and convenient to operate and mild in condition, the catalyst activity and the isomerization efficiency are remarkably improved through the synergistic effect of Ni and Pt, the catalyst preparation cost is greatly reduced while the use amount of precious metal is reduced, efficient conversion of long straight-chain alkane can be achieved, and the isomerization conversion rate of n-dodecane within 60 minutes can reach nearly 90%.

A catalyst includes from 5 ppmw to 1000 ppmw of platinum, from 0.1 wt. % to 10 wt. % of gallium, from 2300 ppmw to 30000 ppmw of iron, and at least 85 wt. % support, wherein the support includes one or more of alumina, silica, or combinations thereof.

The invention provides a composite hydrogen transfer catalyst based on an MOFs material as well as a preparation method and application of the composite hydrogen transfer catalyst. The composite hydrogen transfer catalyst comprises the MOFs material loaded with an active metal component and solid alkali, the active metal component is selected from at least one of palladium, platinum, ruthenium, rhodium and nickel; the active metal component accounts for 0.5-5% of the mass of the catalyst; the MOFs material is selected from at least one of ZIF-8, MIL-101, UiO-66, HKUST-1 and MOF-5 (Metal Organic Frameworks); the solid alkali is selected from at least one of magnesium oxide, calcium oxide, hydroxyapatite and barium oxide. The catalyst provided by the invention has the advantages of high catalytic activity, good selectivity, strong stability, reusability and the like, can efficiently catalyze fatty alcohol to perform hydrogen transfer reaction under a lower-temperature reaction condition to prepare Guerbet alcohol, remarkably improves the yield and purity of a product, and reduces the reaction energy consumption and cost.

The invention discloses a power battery insulation pressure-sensitive adhesive and a preparation method thereof, and belongs to the technical field of high-molecular polymer materials, the power battery insulation pressure-sensitive adhesive comprises an insulation base material, a fluorine grafting agent, a phosphorus grafting agent, silicon-based resin, a cross-linking agent and a platinum catalyst, the preparation method comprises the following steps: S1, fluorine side chain grafting; s2, phosphorus side chain grafting; s3, dispersing the silicon-based resin; s4, carrying out a cross-linking reaction; and S5, impurity removal and purification. Through a fluorine-phosphorus side chain grafting reaction, the balance of initial viscosity and persistent viscosity of a system is optimized, a synergistic protection system is constructed, a fluorine element forms a compact permeation barrier, a phosphorus element provides an efficient char forming flame retardant site, and an insulating framework of PHMS and a cross-linked network of PHS are matched, so that the flame retardant performance of the composite material is improved. The problems of insufficient insulation stability, unbalanced initial viscosity and persistent viscosity and poor flame retardance caused by lack of targeted function modification in the prior art are solved, and the pressure-sensitive adhesive has the potential of being applied to preparation of a power battery pressure-sensitive adhesive.

The invention discloses a heat-conducting gasket suitable for automatic production and a preparation method and application thereof.The heat-conducting gasket comprises a deformable adhesive layer and an adsorption layer, the deformable adhesive layer is prepared from, by weight, 1.8-2.7 parts of double-end vinyl silicone oil, 2-3.3 parts of single-end vinyl silicone oil, 0.01-0.05 part of hydrogen-containing silicone oil, 0.2-0.5 part of silane coupling agent and 0.003-0.006 part of platinum catalyst, and the adsorption layer is prepared from, by weight, 1-3 parts of silane coupling agent, 1-3 parts of hydrogen-containing silicone oil, 1-3 parts of hydrogen-containing silicone oil, 1-3 parts of hydrogen-containing silicone oil, 1-3 parts of hydrogen-containing silicone oil, 1-3 parts of the adsorption layer is prepared from the following components in parts by weight: 40 to 60 parts of double-end vinyl silicone oil, 0.05 to 0.1 part of hydrogen-containing silicone oil, 0.003 to 0.006 part of a platinum catalyst, 0.012 to 0.024 part of an inhibitor and 40 to 60 parts of inorganic powder. The heat-conducting gasket provided by the invention has enough structural strength to bear adsorption operation of automatic equipment while keeping extremely low assembly stress.

The invention relates to the technical field of precious metal recovery, in particular to a method and system for recovering gold, silver, palladium and platinum from silver anode slime. S2, palladium precipitation: adding a potassium-magnesium mixture and sodium chlorate into the pre-impregnation liquid obtained in S1 to obtain palladium precipitation residues and platinum precipitation liquid; s3, separating gold; s4, platinum and palladium precipitation: adding a potassium-magnesium mixture and sodium chlorate into the gold separation liquid obtained in S3 to obtain platinum and palladium precipitation residues and platinum and palladium precipitation post-liquid; s5, gold is reduced; s6, platinum and palladium separation, wherein hydroxylamine hydrochloride is added into the platinum and palladium precipitation residues obtained in the step S4, and palladium separation liquid and platinum precipitation residues are obtained; 7, platinum purification, wherein hydroxylamine hydrochloride is added into the platinum precipitation residues obtained in the step 6, and platinum separation liquid is obtained; s8, carrying out primary palladium deposition; s9, carrying out secondary palladium deposition; and S10, palladium is reduced. The recovery rate of palladium is 99% or above, the recovery rate of platinum is 99% or above, the purity of platinum is 99.9%, the purity of palladium is 99.95%, the recovery rate of silver is 98.5% or above, and the recovery rate of gold is 99% or above.

The invention provides an insulating high-thermal-conductivity flexible silica gel sheet and a preparation method thereof. The silica gel sheet comprises the following components in parts by weight: 1-5 parts of organic boride; 1 to 5 parts of a polysilazane compound; 1-5 parts of hydrogen-containing silicone oil; 5 to 10 parts of dimethyl silicone oil; 20 to 30 parts of vinyl silicone oil; 50-80 parts of a heat-conducting filler; 0.01 to 0.1 part of a platinum catalyst; the heat-conducting filler comprises a heat-conducting filler 1 and a heat-conducting filler 2, the heat-conducting filler 1 is selected from any one of boron nitride, aluminum oxide and magnesium oxide, and the heat-conducting filler 2 is selected from any one of graphene, silicon carbide and silicon nitride. The flexible silica gel sheet provided by the invention realizes comprehensive optimization of high heat-conducting property, excellent electrical insulating property, thermal mechanical stability and surface flatness.

The invention belongs to the technical field of nickel-based superalloys, and discloses a surface protection method of a superalloy material used in a high-temperature, high-pressure or oxygen-enriched environment. The method comprises the following steps: coating the surface of a high-temperature alloy material with a pure platinum coating; the high-temperature alloy material is used in at least one environment of high temperature, high pressure and oxygen enrichment; the high temperature ranges from 550 DEG C to 750 DEG C; the high pressure is 2 to 55 MPa; the rich oxygen is oxygen concentration gt; 90%. The oxygen-enriched ablation resistance of the high-temperature alloy material is improved, and the use safety of the high-temperature alloy material in a high-temperature, high-pressure and oxygen-enriched severe environment is improved.

A hydrometallurgical process for recovering a plurality of metals from a complex rare and precious material, comprising the following steps: step 1: adding a complex rare and precious material to a hydrochloric acid solution, adding an oxidant for reaction, and then performing filtration to obtain a chlorination liquid and a chlorination residue; step 2: using two-stage counter-current gold loading to obtain a gold-loaded liquid and a post-loading liquid, reducing the gold-loaded liquid, performing clarification to obtain an organic phase, and filtering a precipitate to separate a post-reduction liquid and sponge gold; performing evaporation and concentration on the post-reduction liquid to produce a concentrate 1 and a condensate; and cooling and crystallizing the concentrate, performing filtration to obtain residual oxalic acid, and returning the residual oxalic acid to the reduction process and a post-crystallization liquid to gold loading; step 3: performing low-temperature distillation on the post-loading liquid to obtain a concentrate 2; step 4: performing high-temperature distillation on the concentrate 2 to obtain a concentrate 3; step 5: performing directional crystallization and centrifugal filtration on the concentrate 3 to obtain a crystallization residue and selenous acid; and step 6: washing the crystallization residue by using cold water or a low-acid-level condensate produced in step 3, and performing filtration to obtain a tellurium residue and a palladium-platinum-rhodium-rich liquid.

The invention belongs to the field of catalysts, and particularly relates to a three-dimensional interconnected carbon tube grid film loaded with platinum-ruthenium clusters and a preparation method and application thereof. The preparation method comprises the following steps: depositing a carbon tube in a confinement pore channel of a porous alumina template through chemical vapor deposition, and then removing the template to obtain a three-dimensional self-supporting interconnected carbon tube (CT) grid membrane; and through wet chemical synthesis, accurately controlling the reaction conditions and the raw material ratio, and uniformly loading PtRu atomic clusters (PtRu ACs) on the three-dimensional interconnected carbon tubes. The product PtRu ACs-CT has an atomic-scale hydrogen overflow effect as a self-supporting electrode, can capture protons through Pt-Ru bridge sites and promote rapid diffusion of hydrogen to adjacent Ru sites, and efficiently dissociates hydrogen at the Ru sites. Meanwhile, the strong bonding of the cluster and the substrate effectively inhibits the cluster agglomeration, solves the problems that the existing noble metal catalyst has poor stability, few active sites and low efficiency, and cannot meet the requirement of high current density hydrogen production, and has wide application prospects.

The invention discloses a surface plasmon resonance (SPR) hydrogen sensor based on an Ag / PDMS / Pt-WO3 multilayer structure. The SPR hydrogen sensor is characterized by comprising a halogen lamp light source, two sections of multimode optical fibers, a spectrometer and an SPR hydrogen sensing head, wherein the SPR hydrogen sensing head is composed of a different-core structure formed by multimode-single-mode-multimode optical fibers, a silver film, PDMS (polydimethylsiloxane) and Pt-WO3 (platinum-tungsten trioxide). The SPR hydrogen sensor based on the Ag / PDMS / Pt-WO3 multi-layer structure, which is simple to prepare, high in sensitivity and capable of being repeatedly used for a long time, is provided aiming at the defects that an existing optical fiber SPR hydrogen sensor is low in sensitivity and complex in device manufacturing, and PdH is changed from an alpha phase to a beta phase when Pd is used as a hydrogen sensitive material, so that the use of the device is influenced, and the like. When the hydrogen concentration is increased, the Pt-WO3 reacts with the hydrogen to generate heat, so that the refractive index of the PDMS film is changed, the SPR resonance spectrum is moved, and the hydrogen concentration is obtained by observing the offset of the PDMS film. The high refractive index sensitivity of SPR is brought into full play by utilizing the high refractive index change of PDMS, so that high-precision detection of hydrogen leakage is realized.

A method for the production of a powder of platinum, dispersion-hardened platinum, non-dispersion-hardenable platinum alloy, dispersion-hardenable platinum alloy or dispersion-hardened platinum alloy, comprising the steps of (1) providing a wire of platinum, dispersion-hardened platinum, non-dispersion-hardenable platinum alloy, dispersion-hardenable platinum alloy or dispersion-hardened platinum alloy, and (2) plasma atomizing the wire provided in step (1) to form the powder of platinum, dispersion-hardened platinum, non-dispersion-hardenable platinum alloy, dispersion-hardenable platinum alloy or dispersion-hardened platinum alloy.The powder produced according to the method is characterized by a narrower particle size distribution and pronounced sphericity.

The invention relates to the technical field of medical detection equipment, and particularly provides a wearable sweat glucose detection system which comprises a sweat collecting and conveying unit which is provided with a sweat inlet and a sweat flow channel which are communicated with each other and is used for collecting and conveying sweat secreted by skin; the electric signal acquisition unit is arranged on the sweat flow channel, comprises a counter electrode, a working electrode and a reference electrode which are sequentially arranged along the flowing direction of sweat in the sweat flow channel, and is used for acquiring a real-time electric signal related to the glucose concentration; the working electrode comprises a porous alloy structure layer composed of platinum and nickel and a glucose oxidase layer located on the surface of the porous alloy structure layer; the signal processing unit is used for acquiring the real-time glucose concentration according to the real-time electric signal and a preset change curve of the electric signal about the glucose concentration; the system can effectively improve the sensitivity of glucose concentration detection and reduce the dosage of precious metal.

A catalyst suitable for dehydrogenation of hydrocarbons may include from 0.0005 wt.% to 0.1 wt.% of platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof; from 0.1 wt.% to 10 wt.% of gallium, indium, thallium, or combinations thereof; from 0.1 wt.% to 5 wt.% of lanthanum, yttrium, or zirconium; at least 85 wt.% support, and from 0 wt.% to 0.001 wt.% cerium.