Composition precursor and mixed cerium and zirconium oxide-based composition, and procedure for preparation and use thereof
US5908800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1996 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Oct 3, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a procedure for preparation of a precursor of a mixed cerium and zirconium oxide-based composition, characterized by the following steps: PA1 a liquid mixture is prepared containing cerium and zirconium compounds; PA1 the preceding mixture is placed in contact with carbonate or bicarbonate, thus forming a reactive medium exhibiting a neutral or basic pH during the reaction; PA1 the precipitate obtained is collected. A mixed cerium and zirconium oxide-based composition is obtained by calcining this precursor. This composition is characterized by the fact that it has a total pore volume of at least 0.6 cm.sup.3 /g, and that at least 40%, and more particularly at least 50%, of the total pore volume is composed of pores having a diameter of at most 1 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.