41results about How to "Many active centers" patented technology

The invention relates to an alkali-modified alumina material having a high specific surface area, a preparing method thereof and applications of the material. The specific surface area of the alumina material is not less than 350 m<2> / g and the pore volume of the alumina material is not less than 0.5 cm<3> / g. The method includes (1) weighing active alumina powder and pseudoboehmite dry gel powder according to preset mass percentages and fully mixing the active alumina powder and the pseudoboehmite dry gel powder, (2) preparing an aqueous solution of EDTA or a sodium salt of EDTA, adjusting the pH value of the aqueous solution by using an alkali metal salt to achieve full dissolution, and performing particle molding through adopting the aqueous solution as an adhesive, and (3) subjected molded particles to hydration curing, drying and calcination to obtain the alumina material. Compared with the prior art, the prepared alumina material has the high specific surface area, a specific pore structure and surface properties, can be adopted as an adsorbent for a plurality of fields, especially the environment protection field, and can be used for treatment of complexing metal waste water.

The invention relates to a preparation method for a catalyst used for preparing 1,2-epoxybutane through epoxidation of 1-butene. The preparation method comprises adding a template into a solvent, stirring at 20-100 DEG C, and adding proper amount of an acid to adjust pH to 2-9; mixing a silicon source and a titanium source according to a prescribed ratio, adding into the above solution, and crystallizing the solution with stirring, so as to obtain a gel mixed solution; standing the gel mixed solution at 40-100 DEG C for 12 h-48 h; and separating the gel product to obtain a white solid precipitate, performing washing and drying to obtain a catalyst raw powder, then roasting in muffle furnace, so as to obtain the catalyst applied to epoxidation of 1-butene. The method solves the disadvantages that a conventional butene epoxidation catalyst is relatively low in activity, low in titanium-source utilization rate, low in selectivity and not high in epoxybutane product yield. The method avoids the disadvantage that active compositions in the formed silicon-titanium molecular sieve lose due to hydrolysis of the titanium source, and is effectively applied to prepare 1,2-epoxybutane through epoxidation of 1-butene.

The invention discloses a hollow microsphere core-shell catalyst and a preparation method and application thereof, belonging to the field of organic chemical synthesis, including the preparation of ZSM-5 hollow microspheres, the preparation of ZSM-5 hollow microspheres, pseudo-boehmite and succulent powder get ZSM‑5@γ‑Al 2 O 3 Hollow microsphere carrier; then immersed in NaCl solution and AlCl respectively 3 After the solution, the crystallization reaction gives NaAlCl 4 / ZSM‑5@γ‑Al 2 O 3 Hollow microsphere core-shell catalyst. The catalyst of the invention has good catalytic effect on the preparation of dimethyldichlorosilane by disproportionation of monomethyltrichlorosilane and trimethylmonochlorosilane, and the yield of dimethyldichlorosilane can reach 73 under the condition of 200° C. %above.

The invention discloses a polypyrrolone / polyimide composite porous catalytic film and a preparation method thereof. The preparation method includes following steps: 1), dissolving tetracid monomer and tetramine monomer in a solvent to obtain a polypyrrolone prepolymer solution; 2), sequentially adding a polyamic acid solution, metal components and pore former into the polypyrrolone prepolymer solution to obtain a mixed spinning solution, and forming a composite nano fiber precursor through electrostatic spinning; 3), subjecting the composite nano fiber precursor to vacuum drying and thermal treatment to obtain the polypyrrolone / polyimide composite porous catalytic film. The polypyrrolone / polyimide composite porous catalytic film obtained by the method has high heat resistance and mechanical performance when being applied in the field of petroleum catalysis, and expense needed for separating reaction liquid from a catalyst is reduced.