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

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

1979-05-31

1981-01-20

Gantz, Delbert E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252438, 252450, B01J 2702, B01J 2724, B01J 2900

Patent

active

042461375

ABSTRACT:
A method of preparing large pore volume zirconia-silica catalyst supports, the resulting supports and a method of polymerizing 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 M.sub.4 Zr(C.sub.2 O.sub.4).sub.4.nH.sub.2 O, where M is an alkali metal or ammonium ion and n equals 0 to 10, with a silicon compound of the type A.sub.2 SiO.sub.3, 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 distillation or by washing with a water miscible solvent and then calcining the resulting xerocogel.

REFERENCES:
patent: 2289919 (1942-07-01), Lee et al.
patent: 2444913 (1948-07-01), Bond
patent: 3801705 (1974-04-01), Krekeler et al.
patent: 3862104 (1975-01-01), Witt
patent: 3950316 (1976-04-01), Witt
patent: 3953413 (1976-04-01), Hwang et al.
patent: 4054511 (1977-10-01), Miole et al.

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