High specific surface/reducibility catalyst/catalyst support compositions comprising oxides of zirconium, cerium and lanthanum and of yttrium, gadolinium or samarium
US8728435B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2007 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Jul 7, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Catalyst/catalyst support composition essentially consist of oxides of zirconium, cerium and lanthanum and of another rare earth selected from among yttrium, gadolinium and samarium, having a proportion of the lanthanum oxide and the oxide of the other rare earth of at least 15% and specific surfaces of at least 40 m2/g and at least 15 m2/g after calcination respectively for 4 hours at 1,000° C. and 10 hours at 1,150° C.; after calcination for 10 hours at 1,200° C. these have a surface of at least 7 m2/g and such surface is at least 5 m2/g for an embodiment in which after 10 hours of calcination at 1,150° C. the composition is in the form of a pure solid solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.