Combustion catalyst for treating diesel exhaust gas and method for treating diesel exhaust gas
US7875572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2005 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Jan 29, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2510/065
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a catalyst for combustion treatment of suspended particulate matter in diesel exhaust gases, and a combustion catalyst for treating diesel exhaust gases in which a precious metal or an oxide thereof as the catalytic component is loaded on a carrier composed of oxide ceramic particles comprising ceria-zirconia or ceria-praseodymium oxide. In the present invention, depending on the carried precious metal, the carrier is preferably composed of oxide ceramic particles further comprising yttria or lanthanum oxide. The present invention provides a sufficient activity to combust suspended particulate matter in exhaust gases, and can cause combustion at a low temperature of about 300° C. It operates stably for a long period, and can burn suspended particulate matter, especially carbon microparticles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.