Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Patent
1983-06-07
1984-10-09
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
502256, B01J 2106, B01J 2326
Patent
active
044762437
ABSTRACT:
Catalysts prepared from large pore volume zirconia-silica catalyst supports and a method of polymerizing olefins comprising contacting an olefin or mixture of olefins with the catalysts. 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 with an aqueous liquid. 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.
REFERENCES:
patent: 3120483 (1964-02-01), Hansford et al.
patent: 3950316 (1976-04-01), Witt
patent: 4279780 (1981-07-01), Dombro
Chemplex Company
Dees Carl F.
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