Composition based on zirconium oxide and on at least one oxide of a rare earth other than cerium, having a specific porosity, processes for preparing same and use thereof in catalysis
US10189010B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Nov 21, 2011 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Nov 21, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composition of zirconium oxide and at least one oxide of a rare earth other than cerium is described. The zirconium oxide has a weight proportion of at least 50% and, after calcination at a temperature of 900° C. for 4 hours, the composition exhibits two populations of pores of which their respective diameters are centered. The diameter of the first pore has a value of from 20 nm to 40 nm and in the second pore has a value of from 80 nm to 200 nm. Further described is how the composition can be used for treating the exhaust gases of internal combustion engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.