B.E.T. specific surface-stabilized ceria
US5529969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ceric oxide (ceria) particulates exhibiting a particularly small crystallite size, well suited for catalyst/catalyst carrier applications, include a specific surface-stabilizing amount of silicon values (preferably less than 1% by weight thereof, expressed as SiO.sub.2) and have a specific surface of at least 40 m.sup.2 /g after calcination at 800.degree. C. for 6 hours and of at least 20 m.sup.2 /g after calcination at 1,000.degree. C. for 6 hours; such CeO.sub.2 particulates are advantageously prepared by (a) suspending certain ceric hydroxides in a basic aqueous reaction medium containing a silicon compound, (b) autoclaving the resulting suspension, (c) cooling and depressurizing such medium of reaction, (d) separating a ceric hydroxide therefrom, and (e) calcining the ceric hydroxide thus separated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.