Catalyzed soot filter and method(s) to make these
US7928032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2008 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Nov 11, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved soot catalyst is comprised of an alkali compound at least partially coated by a ceramic coating comprised of C bonded to a metal, semimetallic element or combination thereof. The improved soot catalyst may be employed in catalyzed Diesel particulate filters. In one method to make a catalyzed Diesel particulate filter, the improved filter is made by contacting a porous ceramic body having an alkali catalyst thereon, coating the alkali catalyst with an organic ceramic precursor, heating the ceramic body to a temperature in an atmosphere sufficient to decompose the organic ceramic precursor to form the soot catalyst on the porous ceramic body without volatilizing substantial amount of the alkali catalyst away.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.