Composite oxide having oxygen absorbing and desorbing capability and method for preparing same
US5580536A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Oct 2, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/50
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite oxide having oxygen absorbing and desorbing capability contains 4.99-98.89% by weight of cerium oxide, 1-95% by weight of zirconium oxide, 0.01-20% by weight of hafnium oxide, and 0.1-10% by weight of an additional metal oxide selected from titanium oxide, tungsten oxide, nickel oxide, copper oxide, iron oxide, aluminum oxide, silicon oxide, beryllium oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide, oxides of rare earth metals other than cerium, and mixtures thereof. The composite oxide includes .PHI. phase as a crystal phase, and has oxygen absorbing and desorbing capability of at least 100 .mu.mol/g at 400.degree.-700.degree. C. The composite oxide is prepared by the wet method or by the dry method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.