Method of cleaning exhaust gas
US5665322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1995 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | Dec 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas cleaner having a heat-resistant, porous foam-type filter as a carrier, the filter being constituted by two portions consisting of a portion having a relatively low density and a high-density, thin layer portion formed on one side of the low density portion, the low-density portion supporting a base metal catalyst consisting essentially of (a) at least one of alkali metal elements, and (b) one or more elements selected from the group consisting of transition elements (excluding platinum-group elements) and Sn, and the high-density, thin layer portion supporting a platinum-group element catalyst. The base metal catalyst may further contain at least one of rare earth earth elements. The exhaust gas cleaning method is conducted by using this cleaner with its low-density portion on the exhaust gas inlet or outlet side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.