Method of preparing catalyst supports

Details Method of preparing catalyst supports Method of preparing catalyst supports

1980-04-18

1981-07-21

Vertiz, O. R.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252454, 252458, 526 96, 526106, B01J 2900, B01J 3702

Patent

active

042797802

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, then residual water is removed by chemically reacting this water with a ketal of the formula RC(OR).sub.2 R where R is the same or different and is an alkyl group of 1-5 carbon atoms, and then calcining the resulting xerocogel.

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