Composition containing oxides of zirconium, cerium and at least one other rare earth and having a specific porosity, method for preparing same and use thereof in catalysis
US8956994B2 · kind B2 · utility
16Cited by
3References
22Claims
0Family size
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Key dates
| Filing date | May 2, 2011 |
| Grant date | Feb 17, 2015 |
| Priority date | — |
| Expiry date | Nov 10, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/17
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composition is described that includes zirconium oxide, cerium oxide and yttrium oxide, or zirconium oxide, cerium oxide and at least two oxides of two rare earths different from cerium in a mass proportion of at least 20% of zirconium oxide and of at most 70% of cerium oxide, wherein the composition further includes, after calcination at 900° C. for 4 hours, two populations of pores having respective diameters centered, for the first population, about a value of 20 nm to 40 nm and, for the second, about a value of 80 nm to 200 nm. The composition can be used for processing exhaust gases of internal combustion engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.