Catalytic compositions comprising the oxides of zirconium, cerium, yttrium, lanthanum and other rare earths
US7964527B2 · kind B2 · utility
17Cited by
5References
24Claims
0Family size
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Key dates
| Filing date | Feb 13, 2007 |
| Grant date | Jun 21, 2011 |
| Priority date | — |
| Expiry date | Mar 14, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Catalytic compositions useful, e.g., for the treatment of internal combustion engine exhaust gases, are based on zirconium oxide in a weight proportion of at least 25%, from 15% to 60% of cerium oxide, from 10% to 25% of yttrium oxide, from 2% to 10% of lanthanum oxide and from 2% to 15% of another rare earth oxide, have a specific surface of at least 15 m2/g and a cubic phase, and are prepared from a mixture of zirconium, cerium, yttrium, lanthanum and the additional rare earth, by precipitating such mixture with a base, heating the precipitate in an aqueous medium, adding thereto a surfactant and calcining the precipitate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.