192results about How to "Good catalytic effect" patented technology

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.

The invention discloses a preparation method for modification aluminoxane, comprising the following steps: a) preparing an inertia solvent solution of aluminium alkyl under the protection of an inert gas; b) mixing water, a modifier and an inertia solvent to prepare a hydrolysis agent under the protection of an inert gas; c) mixing the inertia solvent solution of aluminium alkyl and the hydrolysis agent in a T-type pipe reactor at a temperature of between -10 DEG C and -50 DEG C, flowing the mixture into a kettle reactor, heating the mixture to a temperature of between 10 to 100 DEG C and reacting for 1 to 10 hours; d) obtaining a reaction solution by filtering, reducing pressure to remove the solvent to obtain alkylauminoxane. According to the method of the invention, the interacting effect of the modifier and water is utilized to control the local concentration of water and the composition and concentration of the modifier are used to influence the composition of the generated aluminoxane so as to improve the storage stability and usage effect of the alkylauminoxane.

The invention relates to a single-component polyurethane adhesive and a preparation method thereof. The single-component polyurethane adhesive comprises an adhesive and a quick-drying agent. The adhesive is prepared from 0-3% of dibasic alcohol, 15-50% of polymer polylol, 30-70% of isocyanate, 0-0.3% of catalyst, 0-25% of solvent and 0-15% of plasticizer, totaling 100%. The quick-drying agent is prepared from 1-50% of catalyst, 0-80% of solvent, 0-80% of plasticizer, 0.1-15% of silane coupling agent, 0-10% of dibasic alcohol, 0-10% of polylol and 10-20% of polymer polylol, totaling 100%. The quick-drying agent accounts for 0-10% of the adhesive. The single-component polyurethane adhesive has the advantages of high storage stability and adjustable curing speed, and can adapt to different technological conditions and operating environment temperatures.

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.

The invention discloses a method for preparing active carbon with developed mesopores by using coal. The method comprises: preparing coal by using weakly caking coal and gas coal as raw materials, andcrushing to obtain raw material coal; carrying out briquetting molding on the raw material coal, and granulating to obtain coal particles; carrying out oxidization treatment and carbonization treatment on the coal particles to obtain a carbonized material; and immersing the carbonized material by using a nitrate solution, drying the immersed carbonized material, and carrying out activation treatment to obtain active carbon. According to the present invention, the active carbon is prepared by using a certain amount of the weakly caking coal and the gas coal, such that the properties and the matching effect of the raw materials are well combined; compared to the traditional coal-based briquetting active carbon, the active carbon product of the present invention has the effectively-improvedmesoporosity under the action of the immersing with the nitrate; and with the method, the problem that the mesoporosity is low due to the complete application of coal as the raw material in the production of the traditional coal-based briquetting active carbon is solved.