46results about How to "Increase active center" patented technology

The invention discloses a preparation method of an attapulgite-based refining agent for lubricant base oil adsorption refining. The preparation method comprises the following main processes: acid-activating raw attapulgite, drying, crushing, screening, roasting and activating to obtain the acid-activated attapulgite, organically modifying the acid-activated attapulgite, drying, crushing, and screening to obtain the attapulgite-based refining agent. The attapulgite-based refining agent prepared by the invention has the characteristics that the refining agent can be easily separated from the product without polluting and corroding equipment, and the post-treatment of the product is simple.

The invention discloses a catalyst for use in the preparation of propylene by olefin cracking, and a preparation method thereof. The catalyst is prepared by using molecular sieve raw powder of which the silicon to aluminum (molar) ratio is smaller than 300 as an active main body and by uniformly mixing the molecular sieve raw powder, silica sol and/or alumina sol and a template agent, forming by crystallization, drying, roasting, performing hydro-thermal treatment with high-temperature water vapor, and modifying by using rare earth metal and/or phosphorus as a modifier. The modifier comprises the following components in percentage by weight: 0.2 to 8 percent of rare earth metal, 0.1 to 5 percent of non-metal phosphorus and the balance of molecular sieve. The catalyst has high activity and stability and high propylene selectivity, and can be used in the field of propylene production industry.

The invention relates to an Mg/Al/X ternary composite metal oxide catalyst and a preparation method thereof. The catalyst is characterized in that the catalyst consists of magnesium, aluminum and ternary metal elements, and the surface of a catalyst product is distributed with an aperture of which diameter is 1 to 20mu m and a protrusion of which height is 0.1 to 10mu m; and the ternary metal elements contain Ce, Dy, Fe, Mn, Co, Cd, Zn or Ni soluble salt comprising nitrate, hydrochloride, sulfate, phosphate or perchlorate. The preparation method for the catalyst comprises the following processes in turn: precursor preparation, crystallization, secondary crystallization, molding and calcination. The catalyst is applicable to the production process of the conventional kettle-type or intermittent polyether product, has good narrow molecular-weight distribution effect for the synthesis of the polyether product, has high catalytic rate, and can be recycled.

The invention provides a selective hydrodesulfurization process which comprises the following steps: cutting a gasoline feedstock into light ends and heavy ends; performing liquid-liquid extraction for the light ends to obtain light end raffinate containing olefins and light end extraction oil containing sulfide and aromatics; and using selective hydrodesulfurization catalysts to perform selective hydrodesulfurization for the light end extraction oil and the heavy ends, wherein the main component of the selective hydrodesulfurization catalyst is obtained by loading an active metal component with a metal oxide, treated with a metal salt, as the carrier, wherein the active metal is selected from more than two elements in IA, VIII, VIB and VIIB groups in the periodic table. The selective hydrodesulfurization process provided by the invention has the advantages of high desulfurization rate and small loss of the octane value of sweet gasoline.

The invention discloses a hydrocracking method which comprises the following steps that a straight-run diesel oil raw material is in contact with a hydrocracking catalyst to carry out hydrocracking reaction, and an obtained hydrocracking product is separated to obtain heavy naphtha, diesel oil, a jet fuel and hydrogenation tail oil, wherein the used hydrocracking catalyst adopts a modified Y-shaped molecular sieve, amorphous silica-alumina and aluminum oxide as carriers, and the modified Y-shaped molecular sieve is an Y-shaped molecular sieve which is rich in meso pores and is concentrated in effective pore size distribution. The hydrocracking method is particularly suitable for a hydrocracking technology for carrying out hydro-conversion on straight-run diesel oil to produce the jet fuel, and has very high catalytic activity and aviation fuel product yield and the quality of a product is improved.

The invention relates to 2-methylimidazole zinc salt as well as a preparation method and application thereof. The preparation method comprises the following steps: taking zinc nitrate hexahydrate and 2-methylimidazole as raw materials, and obtaining 2-methylimidazole zinc salt (ZIF-8) in presence of a catalyst; and compounding 2-methylimidazole zinc salt with calcium stearate and zinc stearate to obtain a calcium-zinc composite heat stabilizer. The prepared 2-methylimidazole zinc salt heat stabilizer has the characteristics of no toxicity, no heavy metal, large specific surface area, environmental friendliness and the like, the obtained calcium zinc composite heat stabilizer is an efficient composite heat stabilizer, has good compatibility with PVC and can be easily dispersed, and better initial and long-term thermal stabilities and transparency are given to a PVC product. The preparation method is simple and environmentally friendly in technological route, the raw material source is rich, and the price is low.

The invention relates to a positive electrode material for lithium ion cells and a preparation method thereof. The material provided by the invention is porous vanadic anhydride with an amorphous carbon layer on the surface of vanadic anhydride, wherein the weight friction of vanadic anhydride is 80-99.9% and the weight friction of carbon is 0.1-20%. In comparison with the prior art, the preparation method provided by the invention has advantages of simple technological process, short reaction time, low production cost and the like.

The invention discloses a hydrocracking catalyst carrier and a preparation method thereof. The catalyst carrier adopts a large-grained and high-silicon modified Y type molecular sieve with centralized effective aperture distribution as the main cracking component, and takes amorphous silica-alumina as a second cracking component. The prepared hydrocracking catalyst has high activity and medium oil selectivity, and the produced middle distillate oil has good quality.

The invention discloses a preparation method of cerium-loaded material of hydrochloric acid modified zeolite and an application in a norfloxacin-polluted water body. The preparation method comprises the following steps of using natural clinoptilolite as raw material, and modifying the natural clinoptilolite by hydrochloric acid, nitric acid, sodium chloride and sodium hydroxide. The preparation method has the advantages that 0.1mol/L of hydrochloric acid is used as an optimum modifying solution to dissolve the original impurities which are blocked in zeolite pore channels, the original large-radius cation ions in the zeolite pore channels are replaced, the modifying solution reacts with the zeolite, and the specific surface area of the zeolite is increased from 2.89m<2>/g to 10.71m<2>/g; on the basis of modified zeolite, the rare earth element of Ce (cerium) is loaded, the number of active sites of the zeolite is increased, and the absorbing rate on norfloxacin is obviously improved; the cost is low, the technology is simple, and the operation is convenient; the dynamics fitting of Ce@G zeolite to norfloxacin has better effect on secondary dynamics, and compared with the natural zeolite, the constant of secondary adsorbing rate is increased by 2.5 times; in the actual application, the time of the material removing the norfloxacin is shortened.

The invention relates to the technical field of glass material preparation, in particular to a preparation method of efficient photocatalytic self-cleaning glass. The preparation method comprises thefollowing steps: mixing butyl ester titanate and absolute ethyl alcohol; doping ferric chloride and polyvinyl alcohol under an acid condition; hydrolyzing to obtain titanium dioxide sol; coating a glass plate to obtain efficient photocatalytic self-cleaning glass, wherein iron ions are reacted with titanium dioxide, so that the photocatalytic efficiency of the titanium dioxide is increased; underthe action of titanium dioxide loaded with a layer of silicon dioxide film, increases the adsorption of to a degradation product is increased; stronger hydroxyl groups are formed on the surface, and block the combination of electron hole pairs to generate strongly oxidizing active hydroxy, so that the photocatalytic reaction rate is increased; the titanium dioxide is partially compounded with thesilicon dioxide, so that a film becomes rough, the adsorption performance is enhanced, the efficient photocatalytic self-cleaning glass can change from hydrophobic to hydrophilic quickly and keeps a smaller contact angle, and the hydrophilic property of the self-cleaning glass is improved; and the efficient photocatalytic self-cleaning glass has a wide application prospect.

The invention discloses a modified Y type molecular sieve as well as a preparation method and application thereof. The Y type molecular sieve has the following properties: the crystal particle average diameter is 2.0 to 5.0 mu m, the relative crystallinity is 100 percent to 140 percent, the molar ratio of SiO2/Al2O3 is 30 to 100 and is preferably 40 to 100, the crystal cell parameter is 2.428 to 2.445nm, and the pore volume of a hole with the hole diameter being 2nm to 8nm accounts for 80 percent to 95 percent, preferably 80 percent to 90 percent of the total pore volume. The total acid content of NH3-TPD is 0.2 to 1.0mmol/g, wherein, the strong acid accounts for 75 percent or more of the total acid amount at the temperature larger than 250 DEG C, the pore volume of the Y type molecular sieve is 0.55cm<3>/g to 0.70cm<3>/g, and the specific surface area is 700m<2>/g to 1000m<2>/g. The molecular sieve has the advantages of large crystal particle, high crystalline, high silicon, more concentrated effective hole diameter distribution, favorable heat stability and hydrothermal stability and the like, and is suitable to be used for preparing a hydrogenation catalyst.

The invention provides an ultrafiltration membrane surface modifier. By mixing diatomaceous earth with titanium dioxide, a mixture is added to an yttrium sulfate solution and mixed with chlorinated paraffin, and then calcining is performed; modification of diatomaceous earth is performed by yttrium sulfatecan to increase internal channels of diatomaceous earth and increase the active center of diatomaceous earth; the decomposition of added chlorinated paraffin during calcining can further increase the channels of the diatomaceous earth, and the performance of the ultrafiltration membrane is enhanced; the surface modification of the ultrafiltration membrane is performed by the modifier to form a coating on the surface of the ultrafiltration membrane, direct contact between the pollutant andthe ultrafiltration membrane is reduced, the pollution of the ultrafiltration membrane is reduced, and anti-pollution ability of the ultrafiltration membrane is increased; and after the ultrafiltration membrane is modified by the ultrafiltration membrane surface modifier, the removal rate of chemical oxygen demand, total organic carbon and ammonia nitrogen in sewage is improved compared with an ultrafiltration membrane without modification, and meanwhile, the surface modifier further contains titanium dioxide, and can catalyze the decomposition and degradation of the pollutants.

The invention discloses a preparation method of a copper-zinc catalyst. The preparation method comprises the following steps: (1) carrying out a parallel flow gelling reaction on a mixed solution A and a sodium metaaluminate solution to obtain a slurry I, and aging; (2) adding a mixed solution B and a sodium carbonate solution into the aged slurry I obtained in the step (1) in a dropwise and parallel flow manner, carrying out a gelling reaction to obtain a slurry II, and aging; and (3) carrying out solid-liquid separation on the material obtained in the step (2), and drying, roasting and molding the solid phase to obtain the catalyst, wherein the mixed solution A is an aqueous solution containing a soluble copper salt, a soluble zinc salt and an organic auxiliary agent, and the mixed solution B is an aqueous solution containing a soluble copper salt and a soluble aluminum salt. The catalyst prepared by the method has the advantages of uniform distribution of active metal copper, good synergistic effect, large number of active metal active centers, improved activity, improved selectivity, improved thermal stability and prolonged service life.

The invention belongs to the technical field of preparation and application of nano materials, and particularly relates to a preparation method and application of a COF-300/PPy/Au (G) nano-enzyme catalyst. The preparation method comprises the following steps: firstly, adding terephthalaldehyde and tetra (4-aminophenyl) methane into 1, 4-dioxane, stirring for dissolving, adding acetic acid, standing, and preparing COF-300 by using a solvothermal method; then, by taking a pyrrole monomer as a raw material and water as a solvent, stirring at normal temperature by adopting an in-situ polymerization method to obtain a COF-300-coated PPy composite nano material; finally, using chloroauric acid as a raw material, using trisodium citrate as a reducing agent, and preparing the multilayer gold nanoparticle (AuNPs) modified COF-300/PPy/Au (G) nano-enzyme catalyst through a reduction and in-situ growth method. The COF-300/PPy/Au (G) nano-enzyme catalyst prepared by the preparation method shows anefficient broad-spectrum catalytic action, shows a relatively strong catalytic degradation removal effect on various organic matters, and is mild in preparation condition, simple in method, economicaland feasible.

The invention relates to the technical field of catalysts, in particular to a preparation method of a grafted catalyst for continuous catalytic synthesis of isobutyl isobutyrate. An active center of the grafted catalyst prepared by the method belongs to a molecular form uniformly grafted on a carrier and is higher. Isobutyraldehyde is used as a reactant and reacts under the action of a grafting catalyst to prepare isobutyl isobutyrate, the reaction steps are few, byproducts are avoided, the reaction temperature is low, and the defects that the catalyst is inactivated and is difficult to separate from the product are overcome; besides, no byproducts except water are generated in the reaction process, the influence of water on the product is eliminated, and large-scale production can be achieved. The content of isobutyl isobutyrate in the prepared product is greater than 90%, and the requirements of industrial products are met.

The invention discloses a preparation method of a copper-zinc catalyst, which comprises the following steps: (1) carrying out parallel flow gelatinization reaction on a mixed solution A and a sodium metaaluminate solution to obtain slurry I, and aging the slurry I; (2) dropwise adding the mixed solution B and a sodium carbonate solution into the aged slurry I obtained in the step (1) in a parallelflow manner, carrying out a gelling reaction to obtain slurry II, and aging the slurry II; (3) filtering and drying the material obtained in the step (2), and treating the material with a mixed aqueous solution containing aluminum salt and organic acid; and (4) preparing a catalyst product from the material obtained in the step (3), wherein the mixed solution A is an aqueous solution containing asoluble copper salt, a soluble zinc salt and an organic auxiliary agent, and the mixed solution B is an aqueous solution containing a soluble copper salt and a soluble aluminum salt. The catalyst prepared by the method disclosed by the invention is uniform in active metal distribution, has a good synergistic effect, has a large number of active metal active centers, improves the activity, selectivity and thermal stability of the catalyst, and has a good application prospect.