Method of preparing zirconia-silica xerogels, the xerogels,...

Details Method of preparing zirconia-silica xerogels, the xerogels,... Method of preparing zirconia-silica xerogels, the xerogels,...

C - Chemistry, Metallurgy

08

F

252/39, 402/631

C08F 4/76 (2006.01) B01J 21/06 (2006.01) B01J 37/03 (2006.01) C08F 10/00 (2006.01) C08F 110/00 (2006.01) C08F 110/02 (2006.01)

Patent

CA 1134340

Abstract of the Disclosure A method of preparing large pore volume zirconia-silica catalyst supports, the resulting supports and a method of poly- merizing olefins comprising contacting an olefin or mixture of olefins with a catalyst prepared with these supports. The supports are prepared by reacting a zirconium compound of the formula M4Zr(C2O4)4?nH2O , where M is an alkali metal or ammo- nium ion and n equals 0 to 10, with a silicon compound of the type A2SiO3 , where A is an alkali metal, in an aqueous solution at a pH equal to at least 11, then adding an acidic solution to a pH of about 5-9 to produce a hydrocogel. The hydrocogel is then aged and washed free of soluble by-products first with water, then with aqueous ammonium nitrate and again with water. The water is removed from the washed hydrocogel by azeotropic dis- tillation or by washing with a water miscible solvent and then calcining the resulting xerocogel.

347744

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