24 results about "Platinum oxide" patented technology

The invention relates to a method for preparing a nerofloxacin chiral piperidylamine intermediate, which comprises the following steps of: carrying out condensation reaction on 5-hydroxy nicotinic acid which is simple and easy to obtain and is used as a raw material and different alcohols, screening through a series of asymmetric catalytic hydrogenation conditions to obtain optimal reaction conditions, and under the conditions, carrying out reaction on various 3, 3 '-dihydroxy nicotinic acid and 3, 3'-dihydroxy nicotinic acid to obtain the nerofloxacin chiral piperidylamine intermediate. The 2, 5-disubstituted pyridine quaternary ammonium salt is reduced into a tetrahydropyridine product, and the C5 site enantioselectivity of the product is excellent. The preparation method comprises the following steps: selecting methyl (R)-1-benzyl-5-hydroxy-1, 4, 5, 6-tetrahydropyridine-3-carboxylic acid methyl ester as a substrate, completely hydrogenating by using platinum dioxide hydrogen, and then carrying out methyl ester reduction, dehydroxylation, Mitsunobu reaction and protecting group removal to obtain a key chiral intermediate for industrial synthesis of a quinolone antibacterial drug nemonofloxacin with high enantioselectivity and high yield.

The invention relates to a method for electrochemically hydrogenating isophorone in a divided cell using H2O as a hydrogen source and in the presence of H2SO4 in anolyte and catholyte, wherein a pure-material electrode made of a material selected from graphite, nickel, and steel is used as the cathode and an electrode selected from solid-body and supported electrodes having an active material selected from platinum, graphite, boron-doped diamond, ruthenium oxide, platinum oxide, and / or iridium oxide is used as the anode.

A method is described for regulating the platinum oxide fraction in a catalyst layer of a fuel cell of a fuel cell stack for a motor vehicle, involving the steps: model-based determination of a present fraction of platinum oxide in dependence on a present operating state; determination of the electrical potential and / or a change in potential in dependence on the present fraction of platinum oxide; adapting the fraction of platinum oxide in dependence on an anticipated and / or demanded operating state of the fuel cell and / or of the vehicle.

The invention relates to the technical field of hydrofining, and discloses a bimetallic hydrofining catalyst as well as a preparation method and application thereof. The bimetallic hydrofining catalyst contains an alumina carrier, platinum oxide and cobalt oxide, the platinum oxide and the cobalt oxide serve as active components, the content of the alumina carrier is 80-98 wt%, the content of the active components is 2-20 wt%, the mass ratio of the platinum oxide to the cobalt oxide is 1: (3-400), and the alumina carrier is in bimodal pore distribution within the range of 2 nm-10 nm and 20 nm-50 nm. The bimetallic hydrofining catalyst provided by the invention provides sufficient active sites, optimizes diffusion performance, and has the advantages of good active metal dispersibility, high hydrogenation reaction activity, small noble metal loading amount, low manufacturing cost and excellent catalytic performance.

The present invention relates to a method and device for optimizing the lifespan degradation of a vehicle fuel cell, belonging to the field of fuel cell technology. The method includes: when the vehicle is in park, controlling the output voltage of a single cell to be less than a preset threshold value of 0.65V, and reducing platinum oxide in the catalyst of the single cell to elemental platinum. This method slows the performance degradation of the single cell, optimizes the lifespan degradation of the fuel cell, and reduces maintenance costs for users.

The present invention relates to transition metal (M) oxide modified ruthenium oxide (where M=Pt, Rh, Pd, Ag and / or Au), in particular to platinum oxide modified ruthenium oxide catalyst for oxygen evolution electrodes in polymer electrolyte membrane (PEM) fuel cells, water electrolysis, renewable fuel cells (RFC) or various electrolysis applications.

The invention relates to a titanium-platinum-ruthenium-tantalum metal oxide composite material and a preparation method and application thereof.The titanium-platinum-ruthenium-tantalum metal oxide composite material comprises a titanium substrate and a metal oxide coating attached to the surface of the titanium substrate, and the metal oxide coating comprises a titanium oxide, a platinum oxide, a ruthenium oxide and a tantalum oxide; the titanium-platinum-ruthenium-tantalum metal oxide composite material is abbreviated as a TiPtRuTaOx composite material, and the value range of x is 2-3. The TiPtRuTaOx high-catalytic-activity electrode is prepared by regulating and controlling the proportion of Ti, Pt, Ru and Ta in the alloy, adjusting the charge structure on the surface of a matrix and improving the electrochemical active surface, the catalytic activity of an anode material in the water electrolysis process can be improved, the electrolysis energy consumption can be reduced, the degradation energy consumption of an electrochemical oxidation technology in high-chlorine-content organic wastewater can be reduced, and the application prospect is wide. Meanwhile, the production cost of the anode electrode is reduced.

The present invention relates to a methane combustion catalyst including platinum and iridium supported on a tin oxide carrier for combusting methane in a combustion exhaust gas containing sulfur oxide. In the methane combustion catalyst, a ratio RTO of platinum oxides to metal platinum is 8.00 or more, wherein the ratio RTO is based on existence percentages of the metal platinum (Pt) and the platinum oxides (PtO and PtO2) obtained from a platinum 4f spectrum analyzed and measured by X-ray photoelectron spectroscopy (XPS) and calculated in accordance with the following expression. In the following expression, RPt is an existence percentage of the metal platinum (Pt), RPto is an existence percentage of PtO, and RPto2 is an existence percentage of PtO2.RTO=(RPtO+RPtO2) / RPt  [Expression 1]

The invention relates to the technical field of glycerol hydrogenolysis reaction, in particular to a platinum-based eggshell type catalyst as well as a preparation method and application thereof. The invention provides a platinum-based eggshell type catalyst. The platinum-based eggshell type catalyst comprises the following components in percentage by weight: 1-5wt% of platinum oxide; 0.1 wt% to 6 wt% of a transition metal oxide; 5 wt% to 20 wt% of WOx; 70 wt%-94 wt% of a spherical alumina carrier; the sum of the use amounts of the components is 100%. The platinum-based eggshell type catalyst provided by the invention can reduce the use amount of noble metals, and when the platinum-based eggshell type catalyst is used for preparing 1, 3-propylene glycol through glycerol hydrogenation, the conversion rate of glycerol and the selectivity and yield of 1, 3-propylene glycol can be improved.

The present invention discloses a two-dimensional hydrotalcite-like supported alloy catalyst, its preparation method, and application. The preparation method comprises: subjecting a rare earth hydrotalcite precursor solution comprising a first rare earth metal salt, a second rare earth metal salt, an intercalating agent, and a solvent to a hydrothermal reaction to produce a rare earth hydrotalcite; or subjecting a first mixed reaction system comprising a first rare earth metal salt, a second rare earth metal salt, and a solvent to a hydrothermal reaction, then adding an intercalating agent to the resulting hydrothermal reaction product and subjecting it to a microwave intercalation reaction to produce a rare earth hydrotalcite; immersing the rare earth hydrotalcite in a solution comprising a platinum source to react and form a rare earth hydrotalcite / platinum hydroxide complex; and, subjecting the rare earth hydrotalcite / platinum hydroxide complex to a high-temperature annealing treatment in a reducing atmosphere to produce a two-dimensional hydrotalcite-like supported alloy catalyst. The two-dimensional hydrotalcite-like supported alloy catalyst prepared by the present invention has a low Pt content and high mass and charge transfer efficiency.

The present invention relates to a Pt / SnO2-based methane combustion catalyst for combusting methane in a combustion exhaust gas containing sulfur oxides, the methane combustion catalyst being configured such that platinum and / or platinum oxide is supported on a tin oxide-based carrier containing tin oxide as an essential component. In the methane combustion catalyst according to the present invention, the tin oxide-based carrier comprises antimony-doped tin oxide (ATO). At this time, the doping amount of antimony in the tin oxide-based carrier is preferably 0.1-5.0 mass%. In the present invention, the antimony doped in tin oxide improves the ability of the tin oxide to supply oxygen to platinum and the like. As a result, the activity and durability of the methane combustion catalyst can be improved. The Pt / SnO2-based methane combustion catalyst is highly active and excellent in durability even without the additional carrying of iridium or without the application of an overcoat layer.

The invention relates to the technical field of surface treatment engineering, and particularly provides a preparation method of an MCrAlY surface high-temperature-resistant infrared low-emissivity coating. The preparation method provided by the invention comprises the following steps: S1, depositing an Al layer on the surface of a substrate with an MCrAlY bonding layer by adopting a physical vapor deposition method, and then carrying out thermal oxidation treatment to form an alpha-Al2O3 layer; s2, depositing a compact Al2O3 layer on the surface of the alpha-Al2O3 layer by adopting an atomic layer deposition method; s3, depositing a platinum oxide transition layer on the surface of the compact Al2O3 layer by adopting a reaction magnetron sputtering method, and then depositing a Pt layer on the surface of the platinum oxide transition layer by adopting a magnetron sputtering method; and S4, carrying out heat treatment on the matrix treated in the step S3 to complete the preparation of the high-temperature-resistant infrared low-emissivity coating. The MCrAlY surface high-temperature-resistant infrared low-emissivity coating prepared by the preparation method disclosed by the invention has excellent element blocking performance and interface bonding strength.

The invention relates to a method for electrochemically hydrogenating a ketone in an undivided cell using H2O as a hydrogen source and in the presence of H2SO4 in the electrolyte, wherein a pure-material electrode made of a material selected from graphite, nickel, and steel is used as the cathode and an electrode selected from solid-body and supported electrodes having an active material selected from platinum, graphite, glassy carbon, boron-doped diamond, ruthenium oxide, platinum oxide, and / or iridium oxide is used as the anode.

The invention relates to a diesel particulate trapping catalyst with an irregular zigzag coating and a preparation method of the diesel particulate trapping catalyst, the diesel particulate trapping catalyst is characterized in that the zigzag coating is loaded on a DPF carrier, and the zigzag coating is prepared by coating the air inlet side wall surface of the DPF carrier with slurry or solution containing aluminum and precious metal. Then metal oxide crystals are promoted to grow and anchored on the outer wall of a DPF carrier air inlet side pore channel under a specific heat treatment condition; the noble metal is platinum or platinum and palladium; the metal oxide is an aluminum oxide and a platinum oxide, or an aluminum oxide, a platinum oxide and a palladium oxide, and the sum of single platinum or platinum and palladium oxides accounts for 0.2-5 wt.% of the total amount of the whole coating oxide. The catalyst provided by the invention can realize rapid sedimentation of soot particles and improve the trapping efficiency, and active noble metals are dispersed on the irregular zigzag coating, so that the dual problems of excessive PN emission and insufficient passive regeneration efficiency of a catalytic diesel particulate filter are well solved.

The present invention relates to the field of fuel cell recycling technology, and in particular to a method for recovering proton exchange membrane fuel cell catalysts. Platinum-carbon catalyst powder is placed in a tubular furnace and continuously introduced with CO2 at high temperature to remove carbon and impurities in the platinum-carbon catalyst to obtain spent platinum; a mixture of AlCl3 and H2O2 is used to dissolve the spent platinum to obtain a platinum salt solution; PVP is added to the platinum salt solution and heated under alkaline conditions to react to obtain platinum oxide; the platinum oxide is placed in a tubular furnace and introduced with a reducing gas for reduction to obtain pure platinum particles. The platinum obtained by the recovery method of the present invention has high purity and can obtain better performance after reprocessing. The expensive platinum-carbon catalyst can be reused, effectively solving the problems of low platinum reserves and high costs, and is expected to significantly reduce the cost of fuel cells. In addition, the method is simple, easy to operate and control, and can be mass-produced and industrialized.

The invention discloses an electro-catalysis preparation method of glycollic acid, and relates to the field of electro-catalysis. The method comprises the following steps: constructing an electro-catalysis system comprising an electro-catalyst and an electrolyte, wherein the electrolyte comprises an alkaline solution containing ethylene glycol; and periodically applying an oxidation voltage and a reduction voltage to the electro-catalysis system, and after the reaction is finished, separating and purifying to obtain glycollic acid. According to the method, the oxidation potential and the reduction potential are periodically applied by applying the constant-voltage pulse potential, on one hand, platinum oxide losing catalytic activity is reduced, the catalytic activity is recovered, on the other hand, carbonyl species oxidized by ethylene glycol greatly adsorbed by platinum are reduced, re-adsorption of ethylene glycol and hydroxyl species is facilitated, and the catalytic activity of the ethylene glycol is improved. Under the comprehensive action, the catalytic activity of the catalyst can be maintained, the reaction rate is increased, and the yield and selectivity of glycollic acid prepared through ethylene glycol electro-catalysis are improved.

The application belongs to the technical field of organic synthesis and particularly relates to a synthesis method of tert-butyl 4-triethoxysilyl butyrate. The synthesis method is that tiglic acid is reacted with sulfoxide chloride, then reacted with tert-butyl alcohol to obtain tert-butyl but-3-enoate, and finally, tert-butyl but-3-enoate is reacted with triethoxysilane with platinum dioxide as a catalyst to obtain tert-butyl 4-triethoxysilyl butyrate. The synthesis method is simple in operation, low in raw material price, low in catalyst consumption, high in yield and high in purity, and is suitable for industrial production.

The invention relates to a preparation method of a platinum black catalyst containing a small amount of carbon, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: dissolving a halogen-containing platinum precursor in a strong acid solution, adding silver ions for reaction, and removing precipitates to obtain a reaction solution; adding a boron-phosphorus co-doped carbon material into the reaction liquid; adjusting the pH of the reaction solution in the presence of a pH buffer agent to convert the platinum species into platinum hydroxide and / or platinum oxide; and then carrying out reduction treatment to obtain the platinum black catalyst containing a small amount of carbon. The functional groups and defect structures on the boron-phosphorus co-doped carbon surface are utilized to guide nucleation and growth of platinum species in the reduction process, and platinum black particles which are small in particle size and uniform in distribution are obtained. The obtained catalyst has relatively low density and remarkably improved dispersity and slurry stability while keeping high platinum loading capacity; compared with pure platinum black, the catalyst provided by the invention shows higher electrochemical activity surface area and enhanced electrochemical reduction activity.

The application provides a catalyst for acrylonitrile absorption tower tail gas treatment and a preparation method and application thereof, and the catalyst comprises 80-97 parts by mass of a metal skeleton carrier, 0.5-1 part by mass of an active component, 5-10 parts by mass of an additive and 0.2-0.5 part by mass of a hydrothermal stability material; wherein the active component is at least one of platinum oxide and palladium oxide; the additive is at least one of titanium oxide, vanadium oxide, chromium oxide, manganese oxide, cobalt oxide, nickel oxide, copper oxide and rare earth metal oxide; and the hydrothermal stability material is magnesium-aluminum spinel. The catalyst has excellent activity and stability.

The invention discloses a negative electrode material doped with a composite metal oxide and a preparation method of the negative electrode material. The negative electrode material comprises a substrate and a doping material, the matrix is a boron and phosphorus doped porous graphite / Cu-Sn composite material; the doping material is a composite metal oxide; the chemical components of the composite metal oxide comprise stannic oxide, antimony trioxide, platinum dioxide, platinum and praseodymium dinickel oxide. The preparation method comprises the following steps: preparing colloid containing stannic chloride, antimony trichloride, chloroplatinic acid and praseodymium dinickel oxide; carrying out hydrothermal reaction on the colloid; and carrying out heat preservation in a hydrogen-nitrogen mixed atmosphere to obtain the composite metal oxide. According to the negative electrode material provided by the invention, through the synergistic effect of multiple components, the conductivity, the catalytic activity, the stability and the toxicity resistance of the material are synchronously improved.

The invention discloses an iron ore concentrate efficient enhanced carbon monoxide removal additive and a preparation method and application thereof, and the additive is an innovative product researched and developed aiming at the requirements of the modern iron and steel industry for a low-carbon, efficient and environment-friendly sintering process. The additive comprises the following raw material components: dicyclopentadienyl iron, zirconium oxide, carbon powder, zirconium oxychloride, palladium metal, manganese dioxide, chromic oxide, copper oxide, platinum oxide, zinc oxide, magnesium oxide, vanadium pentoxide, titanium dioxide, rare earth oxide, calcium titanate, borax, bentonite, cellulose, pregelatinized starch, polyvinyl alcohol, tungsten ore powder, cryolite, silicon barium calcium and calcium carbonate. Tungsten trioxide and calcium oxide; the additive adopts a leading-edge nano-catalysis technology and an advanced material formula, the strength and the production efficiency of sintered ore can be remarkably improved while the CO emission reduction rate is reduced by 40% or above, the sulfur synergistic fixation rate reaches 18%, the load of a desulfurization tower is effectively reduced, and the desulfurization cost is reduced.

The invention discloses a platinum drug ultra-carbon dot as well as a preparation method and application thereof. The platinum drug ultra-carbon dot is formed by assembling platinum drug carbon nanodots. The platinum drug carbon nanodot is a coordination compound of a platinum drug and a substituted aromatic compound; the platinum drug is selected from at least one of carboplatin oxide, cis-platinum oxide, cis-platinum diacid and oxaliplatin oxide. The platinum drug ultra-carbon dots have the advantages that the laser wavelength is longer, the penetrability of exciting light in the body is better, the circularity of the platinum drug ultra-carbon dots in the body can be further improved, the platinum drug ultra-carbon dots have efficient cell endocytosis efficiency and tumor enrichment efficiency, in addition, the platinum drug ultra-carbon dots can be enriched in cancer cells or tumor cell parts, and the tumor enrichment efficiency is improved. Under the irradiation of near-infrared band light, Pt (II) compounds and hydroxyl radicals with high cytotoxicity can be quickly generated, so that cancer cells are killed by immunogenicity, and the anti-tumor immune response of an organism is activated while the cancer cells are killed.

The application provides a catalyst for catalytic oxidation of VOCs and a preparation method and application thereof. The preparation method comprises the following steps: performing primary roasting on a catalyst carrier to obtain a roasting product, mixing the roasting product, a platinum source and nitric acid, and performing secondary roasting to obtain the catalyst. In the preparation method of the catalyst, nitric acid is added to remove hydroxyl groups on the surface of platinum species, so that the platinum species is converted into hydroxyl-free platinum oxide, which is beneficial to catalytic oxidation of volatile organic compounds. The preparation method has simple process operation, and the prepared catalyst has excellent catalytic efficiency and can efficiently oxidize volatile organic compounds, so that the catalyst can be applied to various fields containing volatile organic compounds and has good application prospect.

The present invention discloses a preparation method and application of a Pt / LaCoO3 catalyst for synthesizing carbon monoxide by a highly efficient photothermal catalytic reverse water vapor shift reaction. The catalyst is prepared by sequentially preparing a lanthanum cobaltate perovskite support by a sol-gel method, loading platinum oxide on the lanthanum cobaltate perovskite support, and reducing a catalyst precursor. The strong interaction between platinum nanoparticles and the lanthanum cobaltate perovskite support enhances the adsorption and dissociation of carbon dioxide, lowers the initial reaction temperature, increases the yield of carbon monoxide, and ultimately reduces the activation energy (Ea) of the entire reaction. In addition, light energy and heat energy are effectively combined to form photothermal catalysis, and light-induced heat provides sufficient heat energy to activate the adsorbed hydrogen and carbon dioxide, thereby achieving a highly efficient photothermal reverse water vapor shift reaction rate.