Multi-zoned catalyst and trap
US7189376B2 · kind B2 · utility
33Cited by
18References
92Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2003 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Jul 1, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Provided are coated, multi-zoned catalyst substrates that trap and combust hydrocarbon and nitrogen oxides pollutants in a single monolith substrate. In some embodiments, the multi-zoned catalysts contain both radial and axial zones. The zones can be formed by deposition of segregated coating compositions (or washcoats) containing platinum group metals and pollutant adsorbent materials to form layers along the length and radius of the honeycomb substrate. The invention also relates to exhaust gas treating systems that incorporate the multi-zoned catalysts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.