44 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 discloses a preparation method of carbonyl fluoride, which comprises the following steps: with hexafluoropropylene and oxygen as raw materials, introducing gas into a reactor filled with a catalyst for reaction at high temperature; the catalyst is one of palladium oxide, ruthenium oxide, platinum oxide and molybdenum oxide. According to the scheme, the cost is low, the raw material utilization rate is high, and compared with other carbonyl fluoride synthesis methods, the reaction does not involve phosgene, fluorine and other dangerous chemicals, and reaction by-products are few. In addition, according to the method, the toxicity of raw materials is small, hexafluoropropylene can be completely reacted under the condition of excessive oxygen, the reaction process is environment-friendly and simple, and basically no three wastes are generated. According to the method, hexafluoropropylene and oxygen are adopted as raw materials which are common chemical raw materials and are cheap and easy to obtain, and the method is simple in reaction process, mild in reaction, easy to operate and suitable for industrial production.

Methods and systems for the electrochemical epoxidation of alkenes to generate an epoxide are described herein. Said methods and systems comprise: contacting an anode comprising an oxygen atom transfer electrocatalyst with an alkene in the presence of an electrolyte comprising water; applying a voltage to the anode and a cathode to generate the epoxide; wherein the oxygen atom transfer electrocatalyst comprises an at least partially oxidized palladium-platinum alloy characterized by the formula FX1: PdyPtzOx; wherein y is greater than 0 and less than 1; z is greater than 0 and less than 1; wherein the sum of y and z is equal to 1; and x is selected from the range of 0 to 2. The methods and systems disclosed herein comprise a significant advancement in the electrocatalytic epoxidation of alkenes in aqueous and mixed electrolytes using water as the oxygen atom transfer source.

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.

Disclosed are a fuel cell catalyst of which only a portion, which has relatively low catalytic activity and in which the greatest amount of platinum elution occurs and platinum oxide is easily formed, is selectively coated with a protective layer, and thus degradation due to the long-term operation of a fuel cell can be effectively prevented while also minimizing a deterioration in catalytic activity; a manufacturing method therefor; and a membrane-electrode assembly including same. The fuel cell catalyst of the present invention comprises: a nanoparticle containing platinum; and a protective layer which is selectively coated on only a portion of the surface of the nanoparticle and can suppress the oxidation of the platinum through electronic interaction with the nanoparticle.

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 a 1, 1 '-binaphthyl-2, 2'-diamine platinum oxide for treating oxaliplatin drug-resistant tumors, and a pharmaceutical composition and an application of the 1, 1 '-binaphthyl-2, 2'-diamine platinum oxide. The 1, 1 '-binaphthyl-2, 2'-diamine platinum oxide has a structure as shown in a formula (I): # imgabs0, and the 1, 1 '-binaphthyl-2, 2'-diamine platinum oxide can effectively inhibit proliferation of oxaliplatin drug-resistant tumor cells and can be used for preparing potential drugs for treating oxaliplatin drug-resistant tumors.

The invention provides a preparation method of a high-performance formic acid electrooxidation platinum-based catalyst, and belongs to the technical field of electrocatalysis. The micromolecule reducing agent assisted wet chemical method provided by the invention can quickly promote dissolution of a metal precursor and inhibit homogeneous nucleation of noble metal, so that a two-dimensional structure is formed, epitaxial growth of the edge of platinum metal is promoted, and the mixed-phase PtTe2 (at) Pt core-shell nanosheet catalyst is obtained. The two-dimensional structure is beneficial for the catalyst to expose more catalytic active sites, and the oxidation reaction of formic acid is accelerated. The design of the core-shell structure enhances the structural stability of the catalyst under an acidic condition. The catalytic coordination effect of different crystal phases enables the reaction path of formic acid oxidation reaction to be adjusted, so that the catalytic performance is improved. The use of the small molecule reducing agent effectively controls the diffusion and aggregation of platinum metal ions, further adjusts the number of active sites of Pt in the platinum tellurium catalyst, and significantly improves the catalytic performance of formic acid electro-oxidation reaction (FAOR).

An object is to provide a temperature sensor element that can suppress the reduction reaction of a heat-sensitive body even when used in a strong reducing gas environment for a long time. The temperature sensor element (1) includes: a heat-sensitive body (11) whose resistance changes according to temperature; a first covering layer (20) that covers the periphery of the heat-sensitive body (11); a pair of lead wires (15, 15) that are connected to the heat-sensitive body (11) and are led out toward the rear end side through the first covering layer (20); a second covering layer (25) that covers the periphery of the pair of lead wires (15, 15) led out through the first covering layer (20); and a third covering layer (30) that covers the periphery of the first covering layer (20) and the second covering layer (25); the second covering layer (25) is composed of a mixture of at least one of chromium oxide, manganese oxide, ruthenium oxide powder, iridium oxide powder, and platinum oxide and glass.

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.

According to an embodiment of the present application, the present invention relates to a method for coating platinum on an electrode matrix by using a thermal oxidation process without a plating bath, and provides a method for manufacturing a platinum oxide electrode with the desired physical properties by utilizing an electrospray technique and optimizing a coating solution.

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 discloses a synthesis method of (2S)-N-fluorenylmethoxycarbonyl-3-(1-tert-butyloxycarbonyl-4-piperidyl) propionic acid, and relates to the technical field of synthesis of (2S)-N-fluorenylmethoxycarbonyl-3-(1-tert-butyloxycarbonyl-4-piperidyl) propionic acid, in particular to a synthesis method of (2S)-N-fluorenylmethoxycarbonyl-3-(1-tert-butyloxycarbonyl-4-piperidyl) propionic acid. The invention aims to solve the problem that (2S)-N-fluorenylmethoxycarbonyl-3-(1-tert-butyloxycarbonyl-4-piperidyl) propionic acid is not easy to produce in batches. The method comprises the following steps: S1, N-Boc-4-piperidine methanol and paratoluensulfonyl chloride are subjected to a reaction at room temperature to obtain 1-N-BOC-4-(4-methylbenzenesulfonyloxymethyl) piperidine; the defects of complex process, low safety, high cost and the like caused by the use of platinum oxide for high-pressure catalytic hydrogenation, flammable and explosive n-butyllithium, expensive chiral reagents and the like in the traditional method are avoided, and large-scale production is successfully realized.

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 invention relates to a preparation method of platinum oxide powder, which comprises the following steps: uniformly mixing platinum powder with a polymeric dispersant polyvinylpyrrolidone (PVP), treating at 600-1000 DEG C, thermally decomposing the PVP in the high-temperature treatment process to generate oxygen active free radicals, and oxidizing high-temperature active platinum particles into platinum oxide. Platinum oxide powder is prepared by controlling the temperature and adjusting the dispersion and mixing state of platinum powder and PVP. According to the method, the platinum oxide powder is directly prepared from the platinum powder, and the method has the advantages of being short in working procedure and simple in process.

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 belongs to the technical field of fuel cell recovery, and discloses a method for recovering precious metal platinum in a high-hydrophobicity proton exchange membrane fuel cell. And then recovering precious metal platinum from the proton exchange membrane fuel cell under the condition of visible light irradiation by utilizing ferric iron organic acid complexes in different forms and an inorganic or organic iodide system, so as to obtain precious metal leachate. And then the precious metal leachate is dried by distillation, calcined, electrolyzed, directly utilized and the like to obtain platinum oxide, platinum elementary substance and a platinum-based catalyst. In addition, the recovery process is optimized, and iodide is replaced with cheaper and greener persulfate and inorganic chloride. The method provided by the invention has the advantages of simple operation, low cost, low pollution and the like, meets the requirements of national green coordinated development, solves the influence of hydrophobicity on platinum recovery, successfully recovers platinum from PEMFC, and realizes recovery and utilization of platinum resources.

The present invention provides a method for preparing platinum oxide nanopowder and its application. In the present invention, an inorganic compound is used instead of a polymer surfactant as a stabilizer for nanoparticles. By adding a precursor solution containing sulfite to an aqueous solution of a Pt precursor, the strong coordination effect of sulfite is used to complex with Pt to obtain [Pt(SO3)3] 2‑ complex. This complex reacts with hydrogen peroxide to obtain platinum oxide nanopowder. The method of the present invention avoids the adsorption and poisoning of organic impurities on the surface of the powder, and the catalyst has high activity. In addition, the reaction temperature of the present invention is relatively low and the steps are simple, which can solve the problems of complex preparation process, harsh conditions and difficult batch preparation in the existing preparation of platinum oxide nanopowder.

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

Methods and systems for the electrochemical epoxidation of alkenes to generate an epoxide are described herein. Said methods and systems comprise: contacting an anode comprising an oxygen atom transfer electrocatalyst with an alkene in the presence of an electrolyte comprising water; applying a voltage to the anode and a cathode to generate the epoxide; wherein the oxygen atom transfer electrocatalyst comprises an at least partially oxidized palladium-platinum alloy characterized by the formula FX1: PdyPtzOx; wherein y is greater than 0 and less than 1; z is greater than 0 and less than 1; wherein the sum of y and z is equal to 1; and x is selected from the range of 0 to 2. The methods and systems disclosed herein comprise a significant advancement in the electrocatalytic epoxidation of alkenes in aqueous and mixed electrolytes using water as the oxygen atom transfer source.

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

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.