Crystalline ceric oxide sol and process for producing the same
US6706082B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Feb 19, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/40
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Substantially monodisperse crystalline ceric oxide sols and processes for producing such sols are provided. Sols include crystalline ceric oxide particles having a particle size I (particle size converted from specific surface area by gas absorption method) ranging from 10 nm to 200 nm and a ratio of particle size II (particle size measured by dynamic light scattering method) to particle size I ranging from 2 to 6. Sols can be prepared by reacting a cerium (III) salt with an alkaline substance in an aqueous medium under an inert gas atmosphere to obtain a suspension of cerium (III) hydroxide, immediately blowing oxygen or a gas containing oxygen into the suspension to obtain a sol comprising crystalline ceric oxide particles, and wet grinding the resulting sol. Sols are also prepared by calcining cerium carbonate at a temperature of 300 to 1100° C. to give cerium oxide particles, and wet-grinding the resulting particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.