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191results about How to "Good catalytic effect" patented technology

Catalytic preparation method of dicyclopentadiene dioxide by quaternary ammonium heteropoly phosphato tungstate

The invention discloses a catalytic preparation method of dicyclopentadiene dioxide by quaternary ammonium heteropoly phosphato tungstate, which is characterized by comprising the following steps: epoxidation reaction: adding the raw materials of dicyclopentadiene, solvent I and quaternary ammonium heteropoly phosphato tungstate in a reactor, heating the temperature to 30-80 DEG C, stirring and dropwise adding aqueous hydrogen peroxide solution, and reacting for 3-36h under the temperature of 30-80 DEG C after dropwise adding; post-treatment: cooling the reacted materials to room temperature, evaporating solvent I by reduced pressure distillation and separating and removing water to obtain the mixture of the product and the quaternary ammonium heteropoly phosphato tungstate catalyst, dissolving and filtering the mixture by ethyl acetate to obtain filter cake, namely the recovered quaternary ammonium heteropoly phosphato tungstate catalyst, recovering ethyl acetate by performing reduced pressure distillation on filtrate to obtain the crude product, performing recrystallization on the crude product by solvent II, and drying to obtain the product. The invention has the advantages of convenient operation, high safety, small pollution, simple post treatment, and high product yield and purity.
Owner:SICHUAN DONGFANG INSULATING MATERIAL

Preparation method of mesoporous carbon nitride loaded precious nano particle

The invention discloses a preparation method of a mesoporous carbon nitride loaded precious nano particle, which comprises the steps of: with mesoporous silica as a hard template, preparing a mesoporous nitrogen-doped carbon material by using a nano pouring method; then carrying out alkylation reaction by using halohydrocarbon to ensure that the nitrogen-doped carbon surface is subjected to quaternization; enabling an anion group with precious metals to replace a halide ion by means of an ion exchange method, binding on the surface of the material; and finally reducing metal ions by using a reducing agent, and preparing the mesoporous carbon nitride loaded precious nano particle. According to the method, a precious metal particle precursor and a mesoporous material are tightly combined by means of an ion bond, and the precious metal particle is well dispersed on the ordered mesoporous material to form a precious metal/nitrogen carbon compound material. The mesoporous carbon nitride loaded precious nano particle has the activity of the precious nano particle and is high in specific area and large in hole volume of a mesoporous molecular sieve. The mesoporous carbon nitride loaded precious nano particle has excellent catalysis activity and catalysis stability for cathode oxygen reduction of a fuel cell, and has a potential commercial application prospect.
Owner:EAST CHINA NORMAL UNIVERSITY

ZSM-5 zeolite molecular sieve and preparation method thereof

The invention relates to a composite material containing ZSM-5 zeolite and a preparation method thereof. By taking kaolin, diatomite and modified kaolin as main raw materials, the preparation method comprises the following steps: A) roasting the kaolin at the temperature of 500-1000 DEG C for 0.5-10h to obtain a roasted material, adding water into the roasted material, uniformly stirring to prepare slurry, adding an alkali or acid, then reacting at the temperature of 60-90 DEG C for 30-120min and filtering to obtain the modified kaolin; B) adding water and one or more of a dispersant and a pore expanding agent into the material obtained in the step A), the kaolin and the diatomite, uniformly stirring to prepare slurry, forming by spray drying, and roasting the formed material at the temperature of 700-1000 DEG C for 0.5-6h to obtain the roasted material; C) adding sodium silicate, lye and zeolite into the material obtained in the step B), then putting into a crystallization reaction kettle, adjusting the final pH value of the slurry to 9.5-11.5 with an acid, performing hydrothermal crystallization at the temperature of 120-180 DEG C for 30-120h, filtering to remove mother liquor, washing the filtered material with deionized water, filtering and drying the filtered material to prepare a target product. The method has low preparation cost, the content of the ZSM-5 zeolite in the material is high, and the material has good wear resistance and has rich microporous and macroporous structures.
Owner:YUEYANG YITIAN CHEM

Method for treating tailing water from mineral processing plant by microwave

The invention provides a method for treating iron ore site-selection tailing water by utilizing microwave, which comprises the following technical steps: tailing mash is sent to an adjusting tank for adjusting the concentration to 9-11 percent, then sent to a stirring tank with the flow of 160-292m<3>/h, and simultaneously quicklime is dosed into the tailing mash according to the dosing amount of 0.25-0.35kg/m<3>, the tailing mash is stirred at room temperature until the pH value is 10-14, a treatment agent is dosed into the tailing mash according to the dosing amount of 0.117-0.135L/m<3>, the tailing mash is stirred at room temperature until the pH value is 6-9, the tailing mash is sent to an industry microwave oven with the flow of 160-292m<3>/h, under the conditions of the power of 40-50kw and the frequency of 915 MHz, the tailing mash is treated for 1-2 seconds by the microwave and then sent to a turbidness tank for depositing for 240-300 minutes, overflow water is recycled, substrate sludge is sent to a tailing dam for placing. The method realizes the recycling of the tailing water, not only solves the problem of short water resources, but also avoids the potential safety hazard resulted from wet beaches and reduces the manufacture cost.
Owner:KUNMING IRON & STEEL GRP CO LTD

Au/TiO2 nanocrystalline catalysts and application thereof

The invention relates to different morphological Au / TiO2 nanocrystalline catalysts, a catalytic application thereof in preparing epoxy propane from propylene through epoxidation, and a preparation method thereof. The preparation method comprises the following steps: first, carrying out controlled synthesis so as to obtain TiO2 nanocrystalline in two different morphologies of a main exposure (001) surface and a main exposure (100) surface, placing the TiO2 nanocrystalline in a three-mouth flask, adding a certain amount of deionized water, adding a gold precursor solution accounting for 1% of the total weight of Au-TiO2, adjusting the pH value of the solution to 7 to 10, stirring for 1 hour at a temperature of 60 DEG C; filtering and washing the obtained products until the filtrate does not carry out reactions with a AgNO3 solution (namely no precipitate is generated any more), drying for 12 hours at a temperature of 60 DEG C in vacuum, and finally burning for 2 hours at a temperature of 400 DEG C in an air atmosphere so as to obtain the catalysts. The serial catalysts have excellent activity and selectivity in catalyzing propylene epoxidation reactions to prepare epoxy propane. The preparation method is simple, no harmful byproduct is generated, and the obtained catalysts can increase the conversion rate of propylene.
Owner:UNIV OF SCI & TECH OF CHINA

Flue gas adsorption catalytic reaction high-precision desulfurization method

InactiveCN110585919AOptimize mass transfer channelsBalanced Partial Pressure HighGas treatmentDispersed particle separationFlueExhaust gas
The invention discloses a flue gas adsorption catalytic reaction high-precision desulfurization method. The method comprises the following steps: A, pretreating flue gas and cooling; B, enabling the cooled flue gas to flow through an adsorption catalyst solid bed layer arranged in a desulfurization tower; then introducing alkali liquor into the desulfurization tower, and enabling the alkali liquorto flow through the adsorption catalyst solid bed layer, and carrying out a reaction with gas molecules adsorbed in the adsorption catalyst solid bed layer; C, carrying out solid-liquid separation onthe desulfurization solution to obtain a clear solution and a solid phase; D, allowing one part of the clear liquid to return to the desulfurization tower, swashing the adsorption catalyst solid bedlayer, and regenerating the adsorption catalyst solid bed layer; and supplementing an alkali into the other part of the clear liquid to adjust the pH, and then feeding the other part of the clear liquid into the desulfurization tower for recycling as alkali liquor; and E, carrying out gas-liquid separation to remove a liquid phase in the desulfurized flue gas, and thus obtaining exhaust gas. The method has the advantages that deep desulfurization of sulfur dioxide gas in the flue gas is realized, and the production process is simplified.
Owner:宋强

Uses of ionic liquid as catalyst in preparation of liquid crystal polyester, and liquid crystal polyester preparation method

ActiveCN108276567AEfficient and directional catalyticGood catalytic effectIonAcylation
The invention discloses uses of an ionic liquid as a catalyst in preparation of liquid crystal polyesters, particularly performing of a polymerization monomer acylation reaction step and/or a meltingcondensation polymerization reaction step after acylation in liquid crystal polyester preparation reaction steps under the catalysis of an ionic liquid, wherein the ionic liquid is obtained by carrying out a reaction on a heterocyclic organic alkali compound containing two or more nitrogen atoms and an anionic functional compound, and the adding amount of the ionic liquid is 5-2000 ppm based on the total amount of all the added polymerization monomer. According to the present invention, the ionic liquid catalyst has advantages of efficient directional catalytic property, obvious catalytic effect and reduced side reaction of polymerization; the ionic liquid has advantages of excellent stability and long-lasting catalytic effect; the prepared ionic liquid can be directly added to the acylation and transesterification reaction system without purification, such that the operation is simple; and the liquid crystal polyester resin prepared under the catalysis of the ionic liquid catalyst hasexcellent tensile strength and excellent notched impact strength.
Owner:KINGFA SCI & TECH CO LTD +1
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