Engine exhaust catalysts containing palladium-gold
US7534738B2 · kind B2 · utility
69Cited by
42References
20Claims
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Key dates
| Filing date | Nov 20, 2007 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Nov 20, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An emission control catalyst that exhibits improved CO and HC reduction performance includes a supported platinum-based catalyst, and a supported palladium-gold catalyst. The two catalysts are coated onto different layers, zones, or monoliths of the substrate for the emission control catalyst such that the platinum-based catalyst encounters the exhaust stream before the palladium-gold catalyst. Zeolite may be added to the emission control catalyst as a hydrocarbon absorbing component to boost the oxidation activity of the palladium-gold catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.