Weakly acidic colloidal dispersions of cerium (IV) compounds
US5132048A · kind A · utility
13Cited by
8References
18Claims
0Family size
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Inventors
Key dates
| Filing date | Dec 17, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Dec 17, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Weakly acidic colloidal aqueous dispersions of particulates of a cerium (IV) compound, having a pH ranging from 1.5 to 5, well adapted for catalyst applications, are prepared by (a) acidulating a cerium (IV) hydroxide with an acid having a pKa ranging from 2.5 to 5.0, or with a salt or mixture thereof, (b) next separating the resulting cerium (IV) compound that precipitates from the medium of acidulation, and then (c) colloidally dispersing such cerium (IV) precipitate in an aqueous medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.