1477 results about "Platanic acid" patented technology

The invention relates to a method for preparing a catalyst for preparing synthesis gas by reforming methane and carbon dioxide, which comprises the following steps: soaking a carrier into a mixed solution of cerium(III) nitrate and lanthanum nitrate, and drying and roasting the soaked carrier for 2 to 10 hours to obtain a modified carrier (A); soaking the (A) into a soluble nickel salt solution orsoaking the (A) into a chloroplatinic acid solution, and drying and roasting the soaked carrier to obtain (B) or (C); soaking the (B) into the chloroplatinic acid solution or soaking the (C) into thesoluble nickel salt solution, and drying and roasting the soaked carrier to obtain a catalyst precursor, or soaking the modified carrier into a mixed solution of the soluble nickel salt solution andthe chloroplatinic acid, and drying and roasting the soaked carrier to obtain a catalyst precursor; and reducing the precursor in hydrogen and nitrogen mixed gas to obtain the catalyst. The catalyst has the advantages of low cost, good catalytic activity under the reaction condition of large space velocity, high selectivity for H2 and CO, and good sintering resistance and carbon deposition resistance.

The invention provides monolithic catalysts used for oxidizing CO and methanal under ordinary temperature and the preparation method thereof, which belong to the field of environmental engineering. The monolithic catalyst comprises a carrier, a coating, Pt, Pd and addition agent. The preparation method comprises the steps as follows: the carrier is immersed in mixed solution comprising precursor solution of an auxiliary coating and main coating collosol, and then is blown, dried and calcined; then the carrier is immersed in mixed solution comprising chloroplatinic acid solution, chloropalladite acid solution and nitrate solution of the addition agent for more than 4 hours by adopting an isovolumetric immersion method; and finally, reducing agent is added into mixed solution in which the carrier is immersed under the temperature ranging from 45 to 90 DEG C, and then the carrier is taken out, washed through water and dried so as to obtain target products. The monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and the preparation method thereof have the advantages of simple technology, low cost and the like, are easy to control the operation conditions, and are also easy to produce on a large scale. By adopting the Nanometer Pt and Pd catalyst, CO and methanal can be eliminated under the room temperature, thereby having high antitoxic performance, high moisture resistance and stable property.

The invention discloses a preparation method of a polyether modified polysiloxane foam stabilizer and relates to a preparation method of a foam stabilizer for flexible polyurethane foam. The polyether modified polysiloxane foam stabilizer is generated through reaction between allyl epoxyethane and methyloxirane methyl ethers with different molecular weights and silicone oil with low hydrogen content under the conditions that methylbenzene as a solvent and chloroplatinic acid as a catalyst. Through controlling the degree of polymerization of a hydrophilic polyether chain segment and a hydrophobic polysiloxane chain segment of polyether modified polysiloxane, the foam stabilizer has precise hydrophilic-lipophilic balance property, better emulsifying property and a favorable foam stabilizing effect, so that a flexible polyurethane foam mixture has enough stability in a coring stage, a form hole growing stage, a punching stage and an early-stage crosslinking stage, and foam collapse cannot be caused.

The invention discloses a platinum/graphene nano electro-catalyst. The platinum/graphene nano electro-catalyst uses graphene as a carrier and uses platinum as an active component, wherein the mass fraction of the platinum in the catalyst is 10 to 40 percent. A preparation method comprises the following steps: 1) ultrasonically dispersing an oxidized graphite nano sheet into liquid polyalcohol, then adding chloroplatinic acid solution and sodium acetate solution into the liquid polyalcohol, and fully mixing the solution uniformly, wherein the content of the oxidized graphite nano sheet in the mixture is between 0.48 and 1.3 g/L, the concentration of the chloroplatinic acid is between 0.0005 and 0.005 mol/L and the concentration of the sodium acetate is between 0.007 and 0.013 mol/L; and 2) transferring the mixture to a microwave hydrothermal reaction kettle, heating the mixture by microwave to react for 5 to 10 minutes, and then filtering, washing and drying the reaction product to obtain the platinum/graphene nano electro-catalyst. The preparation method of the invention has the advantages of energy conservation, quickness, simple process and the like. The particle diameters of the platinum nano particles in the prepared platinum/graphene nano electro-catalyst are uniform. The catalyst has good electro-catalysis performance, and has wide application in a fuel cell.

The invention relates to a heat curing in-situ forming high-conductivity silicon rubber composition and application thereof. The composition is composed of the following components: (1) 60-90 parts by weight of mixture of ethylene end-blocked polyorganosiloxane in the same or different viscosities; (2) 10-35 parts by weight of silicone oil containing hydrogen; (3) 1-25 parts by weight of one or multiple R<6>cSiX4-c or partial hydrolytic condensation product thereof; (4) 100-500 parts by weight of metal base conductive filler with the average particle size of 10-150 Mum; (5) 0.01-10 parts by weight of organic metal compound or chelate which contains chloroplatinic acid or contains platinum or palladium and is used as metal base catalyst of heat curing; (6) 1-30 parts by weight of reinforcing filler or functional filler. The invention is applied to the shielding case part of RF equipment requiring electromagnetic shielding and sealed environment. The invention reduces material consumption, simplifies production technology and improves production efficiency and cost performance of product.

The invention relates to a platinum/carbon nanotube catalyst suitable for multiphase asymmetric hydrogenation reaction. Platinum is loaded on a carbon nanotube carrier. A preparation method comprises the following steps of: heating a purified carbon nanotube in nitric acid, washing, filtering, washing by using water until the pH value of filtrate is neutral, drying to obtain the carbon nanotube carrier, soaking in aqueous solution of chloroplatinic acid, and performing ultrasonic treatment at room temperature; and stirring and impregnating a mixture of the carbon nanotube and the aqueous solution of chloroplatinic acid, raising the temperature to 110 DEG C from room temperature, drying at the temperature of 110 DEG C, grinding into fine powder, reducing by using aqueous solution of sodiumformate with heating, filtering, washing by using deionized water and drying. The invention also provides the preparation method of the catalyst and application of the catalyst to the multiphase asymmetric hydrogenation reaction.

The invention relates to a method for preparing flame-retardant low-smoke halogen-free hot-vulcanized silicone rubber compounds for metro vehicles, which is characterized in that the method comprises the following technological process: adding methyl vinyl silicone rubber to a kneading machine; adding white carbon black and hydroxyl silicone oil; mixing the materials for 1+/-0.1 hour at a nitrogen-supplying speed of 5+/-0.1 cubic meter/hour at a temperature between 170 and 190 DEG C; cooling to 60+/-5 DEG C; adding porcelainizing powder, aluminum silicate, chloroplatinic acid, zinc stannate and aluminum hydroxide; continuing to mix for 0.5+/-0.05 hour; discharging the materials; filtering rubber in a rubber filter; cooling the obtained product to room temperature; adding 2,5-dimethyl-2,5-bis(tert-butylperoxy) hexane or peroxide bis(2,4-dichloro-benzoyl) serving as a curing agent to an open mill; mixing well; and obtaining the flame-retardant low-smoke halogen-free hot-vulcanized silicone rubber compounds for metro vehicles. As the method adopts halogen-free flame retardant and particularly adopts a porcelainizing smoke-cutting technique, smoke almost completely disappears after the product produced by the method burns for a plurality of minutes, and the inside of the product can be kept in good condition.

The invention discloses a preparation method of a nitrogen-doped graphene loaded platinum nano-particle catalyst. The preparation method comprises the following steps of: firstly, preparing graphene oxide (GO); secondly, preparing polyaniline/graphene oxide (PANI/GO) through a liquid-liquid interface polymerization method; thirdly, drying the PANI/GO, transferring the dried PANI/GO into a tubular furnace, and performing high-temperature treatment for 2 hours at 800 DEG C to prepare NGs (nitrogen-doped graphenes); and finally, ultrasonically dispersing the NGs into an aqueous solution, uniformly mixing the NGs with chloroplatinic acid according to a certain mass ratio, slowly adding sodium borohydride (NaBH4) into the mixed solution, and performing magnetic stirring for 8 hours to prepare the NGs loaded platinum nano-particle catalyst (Pt/NGs) which takes the NGs as a catalyst carrier to uniformly load platinum nano-particles to the surfaces of the NGs without any chemical modification. The nitrogen atoms which are doped into molecular structures of GNs not only provide a large amount of active sites for PtNPs loading, but also enhance the interaction between the PtNPs and an NGs carrier and improve the catalytic stability and catalytic activity of a nano composite material.

The invention discloses a preparation method of PtRu/graphene nano electro-catalyst, comprising the following steps of: ultrasonically dispersing oxidized nano graphite sheets into liquid polylol; then adding a chloroplatinic acid solution and a sodium acetate solution, sufficiently mixing, wherein the content of the oxidized nano graphite sheets contained in a mixture is 0.3-1.1 g/L, the concentration of chloroplatinic acid is 0.0004-0.002 mol/L, the concentration of ruthenium chloride is 0.0004-0.0013 mol/L, and the concentration of sodium acetate is 0.005-0.027 mol/L; transferring the mixture to a microwave hydro-thermal reaction kettle for microwave hydro-thermal reaction for 5-10 minutes; and filtering, washing and drying to obtain the PtRu/graphene nano electro-catalyst, wherein the mass fraction of a PtRu alloy contained in the PtRu/graphene nano electro-catalyst is 20-40 percent, the mass fraction of graphene is 80-60 percent, the atomic ratio of the PtRu alloy is Pt:Ru=1:2-1.5:1, and the liquid polylol is propanetriol or glycol. The preparation method has energy saving, fastness, simple process, and the like; and in addition, the prepared PtRu/graphene nano electro-catalyst has good electrocatalysis property for the oxidation of methanol and ethanol and is widely used as anode catalysts of direct methanol fuel cells.

The invention discloses bovine serum albumin-platinum composite nanomaterial mimetic peroxidase as well as a preparation method thereof and application. Bovine serum albumin is used as a template, and the bovine serum albumin-platinum composite nanomaterial mimetic peroxidase is prepared through biomineralization. Bovine serum albumin-platinum composite nanomaterials are prepared through the following method that chloroplatinic acid aqueous solutions are added to bovine serum albumin aqueous solutions and are mixed, sodium hydroxide aqueous solutions are added to obtain mixed solutions, and water bath heating is carried out; ultrafiltration is carried out on the solutions, then the solutions are washed, and bovine serum albumin-platinum composite nanomaterial aqueous solutions are obtained. The bovine serum albumin-platinum composite nanomaterials have excellent peroxidase activity, and can catalyze hydrogen peroxide oxidation 3, 3', 5, 5'-tetramethyl benzidine hydrochloride to be in color development. Meanwhile, the mimetic peroxidase resists acid and base, high temperature and high salinity, and has excellent short-term indoor temperature stability and long-term indoor temperature stability.

The invention discloses a Pt-CeO2/graphene electro-catalyst which uses graphene as a carrier, platinum as an active component and CeO2 as an auxiliary component, wherein the mass fraction of the platinum contained in the Pt-CeO2/graphene electro-catalyst is 20 percent; and the mole ratio of the platinum and cerium is 1:1-2.5:1. A preparation method of the Pt-CeO2/graphene electro-catalyst comprises the following steps of: ultrasonically dispersing oxidized nano graphite sheets into glycol; then adding a chloroplatinic acid solution, an aqueous ammonium ceric nitrate solution and an aqueous sodium acetate solution, and sufficiently mixing; transferring a mixture to a microwave hydro-thermal reaction kettle; and after microwave hydro-thermal reaction, filtering, washing and drying to obtain the Pt-CeO2/graphene electro-catalyst. The preparation method has energy saving, fastness, simple process, and the like; and in addition, the prepared Pt-CeO2/graphene electro-catalyst has high electrocatalysis activity for the electrochemical oxidation of methanol and is widely used for direct methanol fuel cells.

The invention discloses a method for preparing a solvent-free polyether grafting organosilico/diamide compound emulsion defoamer. Under the action of chloroplatinic acid-isopropanol catalyst, hydrogen-containing silicone oil, allyl polyether and the like are used as raw materials to prepare serial polyether graft-modification organosilico surfactant in a solvent-free and dark condition; simultaneously, diamide and dimethyl silicon oil are used for reaction so as to obtain diamide silicon paste; and the serial compound emulsion defoamer is obtained by modifying the emulsification caused by theorganosilico to the silicon paste. In the preparation process no organic solvent needs to be added so that harm to operators and the environment can be reduced; in addition, the compound emulsion defoamer has the advantages of a plurality of defoaming components of the polyether, the organosilico and the diamide, not only can realize instant defoaming but also can inhibit foams for a long time, therefore the compound emulsion defoamer has high cost performance.

The invention discloses a three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst. A preparation method comprises the following steps of ultrasonically dispersing graphene oxide sheet in an aqueous solution, adding urea and soluble nickel salt for full and uniform mixing, transferring the mixture into a hydrothermal reaction kettle for reaction, performing freeze-drying to obtain three-dimensional nitrogen-doped graphene, dissolving the three-dimensional nitrogen-doped graphene in ethylene glycol, sequentially adding chloroplatinic acid, copper chloride dehydrate and glutamic acid, and performing microwave reaction to obtain the catalyst. The method has the characteristics of that energy is saved, the speed is high, and the operation is simple; the raw materials are easy to obtain, the yield is high, the capability of platinum in the direct electro-catalytic oxidation of methanol under an acidic condition can be remarkably improved, peak current is 3 to 4 times than that of a commercial carbon black platinum-loaded electro-catalyst and a commercial carbon black platinum-ruthenium-loaded electro-catalyst, and the prepared catalyst is widely applied to a methanol fuel cell.

The invention provides a polycrystalline black silicon texturization treatment fluid. The polycrystalline black silicon texturization treatment fluid comprises a hydrofluoric acid solution, a hydrogen peroxide solution and a metal salt, wherein a volume ratio of the hydrofluoric acid solution to the hydrogen peroxide solution is 1-25:5-40, the mass fraction of hydrofluoric acid in the hydrofluoric acid solution is 40-50%, the mass fraction of hydrogen peroxide in the hydrogen peroxide solution is 20-55%, the metal salt is at least one of copper nitrate, silver nitrate, palladium nitrate, copper chloride, auric chloride acid, chloroplatinic acid, potassium chromate and nickel sulfate, and the mole concentration of the metal salt is 1-10<5>[mu]mol/L. The invention also provides a polysilicon chip texturization method applying the polycrystalline black silicon texturization treatment fluid, and a polycrystalline black silicon texturization product.

The present invention discloses a preparation method of a nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial. The material is prepared according to the following steps of pre-treating flocculent bacterial cellulose generated in fermentation of acetobacter xylophilus, then refrigering and drying the flocculent bacterial cellulose so as to obtain flocculent bacterial cellulose; homogenizing at high speed so as to obtain a uniform solution, mixing the uniform solution with graphene oxide, and dispersing the mixture uniformly through ultrasonic; and adding a dopamine solution, stirring and mixing by using a machine, adding chloroplatinic acid finally, and carbonizing at high temperature so as to obtain the nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial. The composite nanomaterial prepared by the method uses a one-step method to carbonize, and the reaction process is easy. Under the action of the dopamine, the flocculent bacterial cellulose and the graphene oxide are bonded, so as to form a three-dimensional networked cross-linked skeleton structure. In carbonization, nitrogen doping and platinum reduction are realized, and the conductive nanometer composite system that has small and uniformly distributed particles is prepared. The nanomaterial prepared by the method can be applied to application fields such as fuel batteries and super capacitors.

The invention discloses a carbon-containing metal catalyst, a preparation method and an application thereof. The catalyst uses carbon fiber material as a carrier, and uses sodium borohydride, methanol or glycol as a reducing agent. One or several of chloroplatinic acid, chloroauric acid, and other metal precursors are mixed and then reduced to obtain a metal/carbon nanofiber catalyst for fuel cells, preferably with a metal loading amount being 10-60 wt %. The catalyst is high in initially electrochemically active surface area, and relatively small in current density attenuation during a 120-minute chronoamperometry test, has a current density higher than that of present commercial platinum catalyst/XC72R (40 %) during a whole electrochemical chronoamperometry test, and shows relatively high electrochemical activity, relatively high current density and relatively superior electrochemical stability. The catalyst show extremely high resistance to carbon monoxide toxicity.

The invention discloses a platinum nano-material with the activity of four mimic enzymes and a preparation method thereof. The preparation method comprises the following steps: using citrate ions as a modifier, reducing chloroplatinic acid by utilizing sodium borohydride, and preparing the platinum nano-material modified by citric acid. The platinum nano-material is simply and quickly prepared, the particle size is small, and the dispersibility and stability of a water solution are high. The obtained platinum nano-material has the activity of four mimic enzymes at the same time, and comprises peroxidase, oxidase, catalase and superoxide dismutase. The activity of the four mimic enzymes of the platinum nano-material can be adjusted and controlled through the concentration of the citrate ions used in the preparation process.

The invention provides a copper-platinum superlattice alloy nano-tube and a preparation method thereof, and belongs to the technical field of alloy nano-tube preparation. The preparation method comprises the following steps: firstly, a sodium hydroxide solution is used as a pH regulating agent, anhydrous ethylenediamine is used as a morphological controlling agent, and a hydrazine hydrate solution is used as a reducing agent to reduce a copper nitrate solution to prepare a copper nano-wire; the copper nano-wire is treated with hydrochloric acid and water respectively and dried, and is dispersed in deionized water, in which nitrogen is introduced to remove oxygen; and a chloroplatinic acid solution is added to ensure the molar ratio of chloroplatinic acid to copper is 1:5 or 1:3, reaction is carried out for 20 to 60 minutes, and then filtering, cleaning and drying are carried out. The prepared copper-platinum superlattice alloy nano-tube has a hollow nano-tube structure with the lengthof between 3 and 5 mu m and an outer diameter of between 80 and 150 nm, and the alloy tube wall consists of alloy cubic particles with the particle diameter less than 20 nanometers. The preparation method has the advantages of simple condition, quick reaction and high product conversion rate.

The invention discloses a method for preparing a platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst, which comprises the following steps of: adding tetrabutyl titanate into absolute ethanol, stirring for a period of time, slowing dripping into distilled water, adding acetylacetone and polyethylene glycol, regulating a pH value, and strongly stirring for complete hydrolysis to obtain a clear and transparent sol; adding urea with stirring, reacting, adding treated active carbon, continuously stirring, and performing ultrasonic dispersion, standing, filtration, washing, drying and roasting to obtain a nitrogen-doped active carbon supported TiO2 photocatalyst; immersing the nitrogen-doped active carbon supported TiO2 photocatalyst in a chloroplatinic acid solution, adding sodium borohydride for reduction, and drying to obtain a platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst. The invention solves the problem that a titanium dioxide catalyst in a suspension system is difficult to recover, the photocatalytic efficiency of the platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst on a liquid phase dye is further improved, and the platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst has stronger response under the condition of visible light.