Zirconium/cerium mixed oxide catalyst/catalyst support compositions having high/stable specific surfaces
US5532198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Feb 10, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/0045
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Zirconium/cerium mixed oxides (optionally including thermally stabilizing dopant values), comprising solid solutions thereof, having contents of zirconium of up to 99% by weight, and having high specific surface areas, are well suited as catalysts and/or catalyst supports, notably for the treatment/conversion of vehicular exhaust gases; such ZrO.sub.2 /CeO.sub.2 mixed oxides are conveniently prepared by (i) intimately admixing a zirconium sol with a cerium sol, the ratio r of the mean diameter r.sub.1 of the particles of the zirconium sol to the diameter r.sub.2 of the particles of the cerium sol being at least 5, (ii) spray drying the admixture thus obtained, and (iii) calcining the dried material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.