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117 results about "Keggin structure" patented technology
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Keggin structure is the best known structural form for heteropoly acids. It is the structural form of α-Keggin anions, which have a general formula of [XM₁₂O₄₀], where X is the heteroatom (most commonly are P⁵⁺, Si⁴⁺, or B³⁺), M is the addenda atom (most common are molybdenum and tungsten), and O represents oxygen. The structure self-assembles in acidic aqueous solution and is the most stable structure of polyoxometalate catalysts.
Heteropolyacid modified alumina ethanol dehydration catalyst and preparation method thereof
ActiveCN101940938AIncrease acidityHigh acid strengthCatalyst activation/preparationHydrocarbon from oxygen organic compoundsEthyleneDehydration
The invention relates to a heteropolyacid modified alumina ethanol dehydration catalyst and a preparation method thereof, which mainly solves the problems of high cost of the ethanol dehydration catalyst and low ethylene yield existing in the prior art. The catalyst comprises the following components in part by weight: a) 0.5 to 30 parts of heteropolyacid and b) 70 to 99.5 parts of alumina, wherein the heteropolyacid is at least one selected from HxAB12O40.nH2O or (NH4)mHpAB12O40.nH2O having a keggin structure. The technical scheme solves the problems well and can be used in the industrial production of the preparation of ethylene by ethanol dehydration.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for preparing phosphotungstic heteropoly acid with Keggin structure
InactiveCN102659181ASimple preparation processIncrease productivityTungsten compoundsHigh concentrationInorganic salts
The invention discloses a method for preparing phosphotungstic heteropoly acid with a Keggin structure. The method comprises the following steps of: (1) contacting a tungstate solution and an inorganic acid solution; (2) transferring the solution to a high-pressure reaction kettle, and activating at high temperature under high pressure to obtain an active intermediate; (3) contacting the obtained substance and phosphoric acid to obtain a phosphotungstic acid solution; and (4) adding an inorganic salt precipitator into the phosphotungstic acid solution, precipitating phosphotungstic acid by salting-out and crystallization, filtering, purifying and drying to obtain the Keggin phosphotungstic heteropoly acid. By the method, a process flow is simple, the yield of the heteropoly acid is high, and the preparation cost is reduced obviously; high-concentration strong acid in the conventional method is not used in the preparation process, so that the corrosivity to equipment is reduced greatly; and an inflammable low-boiling point organic extractant is not used, and the safety of preparation is improved greatly.
Owner:CENT SOUTH UNIV
Silicon tungsten, phosphorus heteropoly tungstic acid load type catalyzer used for esterification reaction, manufacturing method and application thereof
The invention is a silicotungstic and phosphotungstic heteropoly acid load catalyst used for esterification reaction, which comprises the following components: Keggin structure silicotungstic acid H3SiW12O40.xH2O and phosphotungstic H3PW12O40.xH20, the content occupies 10 to 50 quality per centage of the amount of the catalyst; the carrier is H Beta zeolite. The invention adopts soaking method to prepare the solid silicotungstic and phosphotungstic heteropoly acid catalyst load on the H Beta zeolite, which can be used for catalyzing the esterification reaction of etic acid, isobutanol, isobutanol and ethanol, but also can be used for catalyzing esterification reaction of lactic acid and isobutanol to synthesis n-butyl acetate, isobutyl acetate, ethyl acetate and N-Butyl Lactate. The invention has the advantages of good stability, high activity and good selectivity, but also can used as inhomogeneous catalyst which is easy to be separated with reaction product and can use the prepared and formed catalyst powder in the continuous operating fixed bed reactor. The invention is used in the techinics of esterification reaction catalyzing rectifying.
Owner:BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
Composite catalyst for preparing sec-butyl acetate with direct esterification of ethyl ester and butylene
InactiveCN101293210ASolve the problem of reduced catalytic efficiencyCatalyst carriersOrganic compound preparationHeteropoly acidCordierite
The present invention relates to a composite catalyst for preparing sec-butyl acetate by direct esterification of ethyl ester and butylene, which takes heteropoly acid as the catalyst active component and porous carrier as the dispersant; the weight proportion of the heteropoly acid and the porous carrier is 0.01:1 to 10:1. The heteropoly acid is one with Keggin structure, which consists of phosphotungstic acid, silicotungstic acid, germanium tungstic acid, arsenowolframic acid, phosphomolybdate, germanomolybdate or arsenicomolybdate. The porous carrier comprises porous SiO2, Al2O3, SBA-15, MCM-41, white carbon black, porous SiC, corallite, andalusite, cordierite, meerschaum, Attapulgite or kaolin. The composite catalyst of the present invention solves the problem that the catalysis efficiency is low if the heteropoly acid is separated out from the reaction system.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
Method and technique for preparing Nano type sol of polyaluminium chloride in high purity
This invention describes a process for preparing high-purity nanoscale polyalumina sols. This invention uses active aluminum hydroxide and industrial hydrochloric acid as raw materials, and adopts a two-stage reverse stripping process to produce a solution of polyaluminum chloride with an alkalinity higher than 50%, which is then increased to 70% or higher using high-purity calcium aluminate as the alkalizer. The process ensures complete stripping of the aluminum hydroxide raw material at normal atmosphere and a low temperature, thus obtaining a high-purity product. In addition, in the produced polyaluminum chloride sols the total content of nanoscale Al13 and Al30 having Keggin structure is higher than 70%, the alkalinity is 70-85% and the aluminum concentration is 10-19% (measured as Al2O3). The product is widely used as raw material for modern fine chemical binders, gluing agent for neutral paper manufacturing, intermediate or additive for modern pharmaceutical technology, coupling agent and catalyst for chemical production and flocculant for water treatment, and has potential applications in such emerging fields as inorganic nanocomposites and inorganic membrane materials.
Owner:RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Hydrolysis method of esters
InactiveCN1541991AImprove the conversion rate of hydrolysisEasy to separateOxygen-containing compound preparationOrganic compound preparationPhosphomolybdic acidHeteropoly acid
The ester hydrolyzing method includes hydrolyzing ester in water to produce C1-C10 fatty acid or aromatic acid and C1-C4 fatty alcohol under the presence of ammonium salt of heteropoly acid as catalyst. The ammonium salt of heteropoly acid is obtained through the reaction between heteropoly acid in Keggin structure and inorganic ammonium salt or organic amine, the heteropoly acid is selected from phosphotungstic acid, silicotungstic acid, silicomolybdic acid and phosphomolybdic acid; the inorganic ammonium salt is selected from ammonium carbonate, ammonium nitrate, ammonium sulfate, ammonium phosphate and diammonium hydrochloride; and the organic amine is selected from fatty amine, alicyclic amine and arylamine. The said ester hydrolyzing method can obtain high conversion rate in relatively lower water / ester ratio and relatively short time, and the catalyst is cheap and easy to separate from the product.
Owner:CHINA PETROLEUM & CHEM CORP +1
Heteropolyacid ionic liquid and application of heteropolyacid ionic liquid in oxidative desulfurization
InactiveCN104592119AHigh activityHigh selectivityOrganic chemistryOrganic-compounds/hydrides/coordination-complexes catalystsOil oxidationIonic liquid
The invention provides a method for preparing a phosphotungstate heteropolyacid ionic liquid and application of phosphotungstate heteropolyacid ionic liquid in diesel oxidative desulfurization. The ions in the ionic liquid comprise phosphotungstic acid anions having a Keggin structure and [C18H20N4O4]<+> organic cations and a catalyst has the general structure of 1,1'-[1,3-phenylenebis(methylene)]bis[3-(carboxymethyl)]-1H-imidazole dihydrogen phosphotungstate. The ionic liquid disclosed by the invention is used as an oil oxidation desulfurization catalyst and has the advantages of being small in usage amount, high in catalytic activity and fast in desulfurization speed and can be recycled and is easy to separate and the like.
Owner:TIANJIN POLYTECHNIC UNIV
Method for preparing high-purity heteropoly acid of Keggin structure
ActiveCN101310857ALow ion contentHigh purityPhysical/chemical process catalystsMolybdeum compoundsHeteropoly acidReaction system
The invention provides a preparation method of high-purity heteropolyacid with Keggin structure, which comprises the steps that an acid precipitant is added into heteropolyacid and / or the water solution of heteropolyacid salt so as to cause the heteropolyacid to precipitate out, and then the heteropolyacid is filtered and dried to obtain the high-purity heteropolyacid with the Keggin structure. The acid precipitant is mineral acid, more specifically, is selected from the mixture of hydrochloric acid and sulphuric acid or nitric acid, or hydrochloric acid, sulphuric acid and nitric acid with any volume ratio. The molar concentration of the acid precipitant in the reaction system is 0.1-8 mol / L. Compared with the prior art, the preparation method of the invention has simple process and high purity of products, does not use a great quantity of inflammable organic extractants when in production, and is applicable to being used as an acid catalyst.
Owner:CHINA PETROLEUM & CHEM CORP +1
Deep hydrodesulfurization solid-acid catalyst of gasoline and preparation method thereof
InactiveCN101767032AReduce sulfur contentGood texturization performanceMolecular sieve catalystsHydrocarbon oils treatmentNitrateHydrodesulfurization
The invention relates to the chemical field, in particular to a deep hydrodesulfurization solid-acid catalyst of gasoline and a preparation method thereof. Keggin-structure polyoxometallate (POM) is carried on a nano-sized ZSM-5 molecular sieve, and nickel nitrate is added to improve the catalytic performance of the catalyst. The invention is applicable to the modification of gasolines such as FCC gasoline, DCC gasoline, thermal cracking gasoline, coker gasoline and the like. The sulphur content in the gasoline treated by the catalyst is greatly reduced, and the catalyst has good low-temperature aromatization performance and is an ideal desulfurating, olefin-reducing and low-temperature aromatization catalyst.
Owner:DALIAN UNIV OF TECH
Method for preparing alkylglycoside by using solid-carrying heteropolyacid catalyst
InactiveCN101239999AHigh activityHigh selectivitySugar derivativesMetal/metal-oxides/metal-hydroxide catalystsHeteropoly acidStrong acids
A preparation of alkyl glycoside which uses solid supported heteropoly acid as catalyst, which pertains to field of preparation of alkyl glucoside. The invention use heteropoly acid solid supported by active carbon as catalyst, execute glycosidation with butanol and glucose, alcohol exchange with C8-C12 alcohol to prepare C8-C12 alkyl glucoside; solid support phosphotungstic acid or silicotungstic acid with a Keggin structure on active carbon to form strong acid catalyst; glycosidation of anhydrous glucose and butanol is carried out in presence of heteropoly acid to obtain n-butyrate glycoside, then alcohol exchange with C8-C12 long chain aliphatic alcohol, after extraction separation and vacuum distillation, C8-C12 alkyl glycoside is obtained. Advantages of the invention is that catalyst is high in activity and selectivity, and is reusable. The Preparation is simple, neutralization, albefaction and decolouration are eliminated. The obtained product is achroic or approximately achroic, transparent, no objectionable odor, and storage-stable.
Owner:JIANGNAN UNIV
Catalyst for producing methyl-acrylate from methyl-acrolein and its production
InactiveCN101073776AImprove stabilityReduce manufacturing costPhysical/chemical process catalystsOrganic compound preparationPolymethyl methacrylateFixed bed
The invention is concerned with the activator of polymethyl methacrylate and the preparation method that makes by methyl propenal directly, which is heteropolyacids catalyst with Keggin structure character. The transforming rate of the activator MAL is over 95%, which can maintain the selection of MMA to be over 90%, the stability of the activator is good; the feedback rate is higher than the reaction that the activator is Pd, the activator is fit for fixing bed reactor, the touching time is 20 to 28second, but, the Pd activator is fit for batch reactor, the reacting time is several hours.
Owner:BEIJING UNIV OF CHEM TECH
A kind of polyaniline nanoribbon compound and preparation method thereof
The invention relates to a nanometer strip conductive polyaniline compound and a preparation method thereof. In the method, ice crystal is employed as the template, and H4SiW12O40 with a Keggin structure is adopted as a doping acid for adjusting the product form. The mild oxidizing agent ferric nitrate is employed to control the polymerization rate of aniline, and silver nitrate is introduced, isreduced to the metal silver through the anti-induction action of aniline polymerization and can be compounded into a polyaniline product. The method simplifies the complex process of template preparation and removal, saves material and energy, and can produce products with single form and high purity. The polyacid doped polyaniline / silver nanoparticle compound of the invention synchronously introduces polyoxometallate (H4SiW12O40) and silver metallic nanoparticles. Under the synergism of silver nanoparticles and polyacid, the compound of the invention shows good response sensitivity to ultraviolet lights with a wavelength of 365nm, so that the compound is able to be used in devices like light sensors, electric switches and the like.
Owner:NORTHEAST NORMAL UNIVERSITY
Preparation method of silicotungstic heteropoly acid loaded catalyst
ActiveCN102744057AFacilitate internal diffusionImprove thermal stabilityOrganic compound preparationCarboxylic acid esters preparationOrganic solventHeteropoly acid
Owner:CHINA PETROLEUM & CHEM CORP +1
Polyoxometallate catalyst for preparing biodiesel
InactiveCN105080606AWide applicability of raw materialsHigh catalytic activityFatty acid esterificationOrganic compound preparationBiodieselPolymer science
The invention relates to a polyoxometallate catalyst for preparing biodiesel. The catalyst is a polyoxometallate compound which has a Keggin structure or a Dawson structure. Biodiesel is catalytically prepared by the catalyst. The catalyst has high catalytic activity and repeatability and wide raw material applicability. The whole preparation process is free of waste water, so that the catalyst is green and environmental-friendly.
Owner:NORTHEAST NORMAL UNIVERSITY
Composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and preparation method thereof
ActiveCN101518731ALower redox potentialHigh utilization rate of visible lightOrganic-compounds/hydrides/coordination-complexes catalystsDeodrantsHYDROSOLPropanediol
The invention discloses a composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: firstly, titanium dioxide collosol, phosphotungstic acid and propylene glycol methyl ether, of which the mass ratio is 20 to 3 to 50, are uniformly mixed to form composite collosol; secondly, the composite collosol is heated for 30 minutes at the temperature of 300 DEG C to form dried gel; and finally, the dried gel is mechanically processed for two hours by ball milling so as to obtain phosphotungstic acid-titanium dioxide photorecombination photocatalyst materials. Compared with the prior art, the phosphotungstic acids of the invention are combined into a stable netty structure in the form of W-O-P molecular linkages, thereby reducing the oxidation-reduction potential, enabling a titanium dioxide composite membrane photoabsorption wavelength to generate redshift, and improving the utility ratio of titanium visible light; and further more, after the subsequent step of heating photocatalysis materials is accomplished, the keggin structure of the phosphotungstic acid is not affected, and high catalytic activity can still be maintained.
Owner:UNIVERSTAR SCI & TECH SHENZHEN
Catalyst for constructing heteropoly acid compound, peroxide and titanium-silicon molecular sieve as well as preparation method and application thereof
InactiveCN106732777AHigh desulfurization activityHigh activityMolecular sieve catalystsOrganic-compounds/hydrides/coordination-complexes catalystsMolecular sieveHeteropoly acid
The invention provides a catalyst for constructing a heteropoly acid compound with a Keggin structure, peroxide and a titanium-silicon molecular sieve. The catalyst is characterized by being prepared from the following components in parts by mass: 1-40 parts of the heteropoly acid compound with the Keggin structure, 1-20 parts of peroxide and 98-40 parts of the titanium-silicon molecular sieve. A preparation method of the catalyst comprises the following steps: after preparing titanium silicon zeolite with an MIF (Migratory Inhibitory Factor) structure, introducing the heteropoly acid compound with the Keggin structure and the peroxide into the components; and washing, drying and roasting. The catalyst provided by the invention has high oxidation desulfurization catalytic activity, and the content of organic sulfur can be reduced to be lower than 10microg / g from 200microg / g; the catalyst has good recyclability; and the catalyst is an ideal oxidation desulfurization catalyst with excellent performance. The preparation method of the catalyst is simple, is easy to operate and is low in preparation cost.
Owner:LIAONING NORMAL UNIVERSITY
Polyoxometallate and compound, preparation method and application thereof
ActiveCN108355700ARealize harmless treatmentPhysical/chemical process catalystsWater/sewage treatment by irradiationPolyoxometalate IMetal
The invention relates to the field of inorganic non-metallic material preparation, and particularly discloses polyoxometallate and a compound, a preparation method and application thereof. The molecular formula of polyoxometallate is (NH4)3PW11O39Sn, polyoxometallate has a Keggin structure, and the grain size is 10nm to 30nm. A catalyst, which is applied in the degradation of organic pollutant acid scarlet 3R, not only has excellent catalytic activity under visible light, but also has the advantages of simple separation and recyclability, and is an environment-friendly catalyst.
Owner:HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
Preparation method and application of immobilized cesium phosphotungstate catalyst
ActiveCN106000463ALarge specific surface areaImprove thermal stabilityOrganic compound preparationOrganic-compounds/hydrides/coordination-complexes catalystsFiltrationActive component
The invention discloses an immobilized cesium phosphotungstate catalyst. Cesium phosphotungstate is introduced in the synthesis process of a metal-organic skeletal material UiO-66 to make the mass ratio of the active component cesium phosphotungstate to the metal-organic skeletal material UiO-66 in the metal organic skeletal immobilized cesium phosphotungstate catalyst reach 0.2-0.65 and the specific surface area of the immobilized catalyst reach 794-1045m<2> / g. A preparation method adopting one-step in situ synthesis can effectively prevent loss of the active site cesium phosphotungstate, so the physical and chemical stability of the catalyst is improved; the Keggin structure, the strong acidity and the oxidation reduction property of cesium phosphotungstate are well kept, so the catalyst has wide application range; adsorption and diffusion of reaction substances on the catalyst are facilitated, so the catalysis efficiency of the catalyst is increased; and the preparation method has the advantages of simplicity, easy operation, easy filtration and separation of the catalyst from products, no corrosion, and no pollution to environment.
Owner:河南正通食品科技有限公司
Method for preparing rare ginsenoside CK from protopanaxadiol ginsenoside through fermentation of microbacterium oxydans
ActiveCN105838770AEasy to trainImprove catalytic performanceMicroorganism based processesFermentationChromatographic separationProtopanaxadiol
The invention relates to a method for preparing rare ginsenoside CK from protopanaxadiol ginsenoside through fermentation of microbacterium oxydans, in particular to a method for preparing 20-O-beta-D-glucopyranose-20-protopanaxadiol ginsenoside from protopanaxadiol ginsenoside Rb1, Rd and the like converted by utilizing fermentation of microbiological strains in a fully-automatic fermentation tank, belongs to the technical field of medicine, and comprises the steps: (1) fermentation cultivation of bacterial strains; conversion of raw materials Rb1, Rd and the like by utilizing fermented microorganisms and taking heteropolyacid HxYW12O40.nH2O with a Keggin structure as a catalyst, wherein Y is selected from P, Si, Fe or Zn, x is 3 or 4, and n is a positive integer ranging from 0 to 30; (3) preparative chromatographic separation and purification of conversion products, so as to finally obtain a compound with the chemical name being 20-O-beta-D-glucopyranose-20-protopanaxadiol ginsenoside.
Owner:NORTHWEST UNIV
Preparation method of organic-inorganic composite photochromic film material
InactiveCN1624494AHigh mechanical strengthImprove wear resistanceLiquid surface applicatorsCoatingsPhosphomolybdic acidNitrogen gas
The invention relates to a preparation method for organic-photic compound millimicron film material with remarkable photo-discoloration performance, its characteristic is that it combines the discoloration molecule self-assembly technology with sol gel course. The following technical steps are included: a. Heteropoly compound keggin structure of tungstosilicic acid, phosphotungstic acid, phosphomolybdic acid are saluted in absolute ethyl alcohol to form solution with a certain density; b. some methyl methacrylate is soluted in the mixture solution of toluene and chloroform then add some vinyltriethoxy silane into it, then it is heated to be 70deg.C in nitrogen and add benzoyl peroxide, stir it greatly until the reaction is complete; c. in the reaction course the heteropoly compound solution is added into; d, the copolymer generated is mixed with metallic alkoxide, benzoyl peroxide in aqueous thermostat and be added with alcohol, abtaining transparent sol solution; e. coat the transparent sol on substrate to be dried for 24 hours, finally the millimicron compound film is acquired.
Owner:SHANGHAI UNIV
Novel polyoxometallate compound, preparation method thereof and application thereof
InactiveCN102658119AEasy to prepareRaw materials are easy to getWater/sewage treatment by irradiationEnergy based wastewater treatmentOrganic dyeWastewater
The invention relates to a novel polyoxometallate compound, wherein the molecular formula of the compound is K6ZrW11O39Sn<II>.12H2O and has a Keggin structure. The polyoxometallate compound prepared in the invention has the advantages of simple preparation method and easily available raw materials; the polyoxometallate compound can be used as a photocatalyst, and can well decolor and degrade organic dye wastewater having an acid brilliant scarlet or acid brilliant scarlet-like structure under visible light conditions; and the polyoxometallate compound has wide application prospects in the organic dye wastewater degradation.
Owner:DALIAN JIAOTONG UNIVERSITY
Process method for preparing ethyl tert-butyl ether
ActiveCN103044213ARegulate acidityRegulatory activityOrganic-compounds/hydrides/coordination-complexes catalystsEther preparation by compound additionPhosphomolybdic acidHeteropoly acid
The invention provides a process method for preparing ethyl tert-butyl ether. The process method comprises the following steps of: taking isobutene and ethanol as raw materials, and using a heteropoly acid / aluminum-based complex oxide catalyst, wherein the heteropoly acid / aluminum-based complex oxide catalyst takes a complex oxide as a carrier and takes heteropoly acid as an active component, the complex oxide is one or more of aluminum-based complex oxides in MgO-Al2O3, TiO2-Al2O3 and ZrO2-Al2O3, and the heteropoly acid is one or more of phosphotungstic acid, silicotungstic acid, arsenotungstic acid, germanotungtic acid, phosphomolybdic acid, silicomolybdic acid, arsenomolybdic acid, germanomolybdic acid and the like. According to the process method provided by the invention, the catalyst adopting the aluminum-based complex oxide to load the heteropoly acid is adopted, so that the shortcomings of inactivation of the catalyst and reduced conversion rate, which are caused by easiness in damaging the Keggin structure of the heteropoly acid of the heteropoly acid catalyst, easiness in loss of acid amount and difficulty in separation, can be overcome.
Owner:CHINA PETROLEUM & CHEM CORP +1
Immobilized heteropoly acid ionic liquid catalyst and preparation method thereof
ActiveCN106732778ASolving activityStructural solutionOrganic compound preparationOrganic-compounds/hydrides/coordination-complexes catalystsBeckmann rearrangementHeteropoly acid
The invention provides an immobilized heteropoly acid ionic liquid catalyst for liquid phase Beckmann rearrangement reaction and a preparation method thereof. A carrier is graphene oxide (GO) powder prepared by a modified Hummers chemical method. The method comprises the following steps: firstly performing condensation reaction between GO and a silane coupling agent, then performing alkylation reaction with imidazole, successively sulfonating with alkyl sultone and finally performing disproportionated reaction through Keggin structure heteropolyacid. The immobilized heteropoly acid ionic liquid catalyst provided by the invention firstly utilizes GO as the carrier, and heteropoly acid ionic liquid with a sulfonic acid group is immobilized on the surface of the catalyst through a chemical grafting method. The preparation method provided by the invention has the benefits that raw materials are easy to obtain, the catalyst is simple to prepare, a solvent can be recycled after the catalyst is used, and almost no pollution is caused to the environment. The synthesized catalyst is applied to the liquid phase Beckmann rearrangement reaction; the catalyst is convenient for separation and recovery operation, and long in service life, so that the use cost is greatly reduced; therefore, the catalyst becomes a green chemical novel catalytic material with an application prospect.
Owner:CHANGZHOU UNIV
Polyacid catalyst, preparation method and use method thereof
ActiveCN106902877AReduce use costEasy to separateSugar derivativesOrganic compound preparationCelluloseWastewater
The invention discloses a polyacid catalyst for catalyzing oriented conversion of lignocellulose and a preparation method thereof. The polyacid catalyst is a polyacid compound with a Keggin structure and can be adopted for catalyzing the lignocellulose to prepare glucose, xylose and oxalaldehyde. The catalyst disclosed by the invention is high in catalytic activity and repeatability and wide in material applicability, and in the whole preparation process, no waste water is generated, and the green and environment-friendly effects are achieved.
Owner:BEIHUA UNIV
Polyoxometallate catalyst for preparing biological diesel oil
InactiveCN1974001AWide applicability of raw materialsHigh catalytic activityPreparation by ester-hydroxy reactionBiofuelsBiodieselPolymer science
The present invention relates to one kind of polyoxometallate catalyst for preparing biodiesel oil, and the polyoxometallate is compound in Keggin structure or Dawson structure. The polyoxometallate catalyst is used in preparing biodiesel oil and has high catalytic activity, high repeatability and wide material adaptability. The preparation process is green and produces no waste water.
Owner:NORTHEAST NORMAL UNIVERSITY
Rare-earth heteropolyacid salt-doped iron-based catalyst and application of catalyst in flue gas denitration
InactiveCN103990480AEasy to prepareNo pollution in the processPhysical/chemical process catalystsDispersed particle separationMass ratioRare earth
The invention discloses a rare-earth heteropolyacid salt-doped iron-based catalyst which is formed by mechanical mixing of rare-earth heteropolyacid salt and iron oxide, wherein mass ratio of rare-earth heteropolyacid salt to iron oxide is 1:2, 1:3 or 1:4; and rare-earth heteropolyacid salt is selected from Keggin structured rare-earth phosphotungstate. The rare-earth heteropolyacid salt-doped iron-based catalyst can be used in selective catalytic reduction of NOx and flue gas denitration. In specific application, ammonia gas is used as a reducing agent and mixed proportionally; and under conditions of a certain space velocity, nitrogen oxide concentration, reaction temperature and normal pressure and in the presence of oxygen, nitrogen oxide in flue gas is removed, and nitrogen oxide is converted to nitrogen. The catalyst provided by the invention has advantages of simple preparation method, no toxicity, no harm, no pollution, high catalytic activity, high stability, high denitration efficiency, high sulfur-resistance performance, simple processing equipment and little investment, and is suitable for industrial popularization.
Owner:SHANDONG UNIV
Process for synthesizing mesoporous TiO2 using phosphotungstic acid as template agent
InactiveCN1944253AAchieve doping modificationLarge specific surface areaMolecular-sieve and base-exchange compoundsMolecular-sieve aluminophosphatesMolecular sieveAlcohol
The process of synthesizing mesoporous TiO2 with phosphotungstic acid as template agent relates to process of synthesizing mesoporous molecular sieve and realizing material doping modification with solid acid template agent and belongs to the field of inorganic porous material synthesizing technology. The mesoporous TiO2 is synthesized through dissolving tetrabutyl titanate in anhydrous alcohol and adding water solution of phosphotungstic acid via stirring; taking the mixture, rotation evaporating and washing; vacuum drying and roasting at 500deg.C for 3 hr. The present invention utilizes the Keggin structure of phosphotungstic acid to form hydrogen bond between the water molecule and phosphotungstic acid molecule and to serve as template agent so as to synthesize the mesoporous material and modify TiO2 simultaneously. The mesoporous TiO2 has great specific surface area, homogeneous pore size, ordered structure and excellent stability.
Owner:TSINGHUA UNIV
Novel Keggin-type polyoxometallate compound as well as preparation method and application thereof
InactiveCN102745748AEasy to prepareRaw materials are easy to getTin compoundsOrganic-compounds/hydrides/coordination-complexes catalystsOrganic dyeWastewater
The invention relates to a novel Keggin-type polyoxometallate compound, wherein the molecular formula of the compound is K6TiW11O39Sn II.7H2O, and the compound has a Keggin structure. The polyoxometallate compound which is prepared according to the invention has a simple preparation method, and raw materials are easily obtained; the polyoxometallate compound as a photocatalyst can have better decoloring and degrading capabilities for organic dye wastewater of reactive red 24 or a reactive red 24-like structure under the condition of visible light; and the novel Keggin-type polyoxometallate compound has wide application prospects in the aspect of degrading the organic dye wastewater.
Owner:DALIAN JIAOTONG UNIVERSITY
Clay mineral absorbing material applied to water treatment and preparation method thereof
InactiveCN104056594AUnique adsorption coagulation performanceIncrease surface areaOther chemical processesWater/sewage treatment by flocculation/precipitationSodium BentoniteClay minerals
Owner:NANTONG UNIVERSITY
Hydrocracking catalyst and preparation method thereof
InactiveCN102309990AImprove conversion rateHigh selectivityOrganic-compounds/hydrides/coordination-complexes catalystsHydrocarbon oil crackingNickel saltHeteropoly acid
The invention which relates to a solid catalyst provides a hydrocracking catalyst which has a high stability and a high activity in a high sulfur content reaction atmosphere and a preparation method thereof. The catalyst comprises a heteropoly acid, a hydrogenation component, and a carrier, wherein the heteropoly acid is H3PW12O40.nH2O or H4SiW12O40.nH2O with the keggin structure, and n is the number of water; the hydrogenation component is a mixture of a Ni compound and a W compound; and the carrier is alumina. The hydrocracking catalyst is obtained by respectively adding an aqueous solution of a nickel salt and an aqueous solution of a tungsten salt to the carrier for dipping, drying a liquid-solid separated solid, roasting, allowing the roasted solid after dipping with an aqueous solution of the heteropoly acid to stand, and drying.
Owner:XIAMEN UNIV
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