Composition based on zirconium oxide and cerium oxide, preparation method therefor and use thereof
US6214306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a composition based on zirconium oxide and comprising cerium oxide which has a specific surface of at least 30 m.sup.2 /g after calcination for 6 hours at 900.degree. C. and which is provided in the form of a pure solid solution of cerium oxide in zirconium oxide. According to another embodiment, this composition can additionally comprise a doping element and can exhibit a specific surface of at least 25 m.sup.2 g after calcination for 6 hours at 1000.degree. C. A process for the preparation of these compositions comprises the following stages: PA1 a mixture is prepared, in liquid medium, containing a zirconium compound and a cerium(IV) compound; PA1 the said mixture is heated at a temperature greater than 100.degree. C.; PA1 the reaction mixture obtained on conclusion of the heating is brought to a basic pH; PA1 the precipitate thus obtained is recovered; PA1 the said precipitate is calcined; the doping element being, if appropriate, added either to the starting mixture in liquid medium or to the reaction mixture obtained on conclusion of the heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.