Twice-aged porous inorganic oxides, catalysts, and polymerization processes
US4981831A · kind A · utility
84Cited by
18References
41Claims
0Family size
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Key dates
| Filing date | Jul 25, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Jul 25, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F10/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A silica-titania cogel or silica-titania-chromium tergel is first aged at a substantially neutral pH, then aged at an alkaline pH, and then spray dried or azeotrope dried to form a xerogel. Optionally, a pore-preserving agent can be added prior to drying. The cogel can be impregnated with a chromium compound. The chromium-containing catalyst is activated by calcination. The activated catalyst can be used as a polymerization catalyst to polymerize mono-1-olefins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.