12 results about "Platinum oxide" patented technology

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 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 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 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 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 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 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.