Highly dispersed substantially uniform mixed-metal-oxide composite supports for exhaust conversion catalysts
US6326329A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1997 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Feb 20, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved catalysts for conversion of exhaust from internal combustion engines are produced by providing a unique, promoted support consisting of a mixed-metal-oxide promoter substantially uniformly dispersed as homogeneous crystallites of less than about 100 .ANG. on a high surface area refractory oxide support substrate. The promoted support is made by a process that involves dissolving a combination of a primary metal oxide precursor with the oxide precursor of at least one additional metal and a compatible organic depositing agent, slowly heating to transform the depositing agent into a gel-like matrix coating the substrate in which the mixed-metal-oxide precursor compounds are uniformly distributed and thereafter calcining to burn off the organic matrix and form the appropriate oxide morphology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.