Exhaust purification device and exhaust purification method of internal combustion engine
US8104271B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2007 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Apr 22, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An SOX trap catalyst (11) in which at least one of an alkali metal and alkali earth metal is carried diffused is arranged in an exhaust passage of an internal combustion engine. By holding the temperature of the SOX trap catalyst (11) during engine operation at the temperature where a nitrate of the at least one of the alkali metal and alkali earth metal becomes the melted state, a nitrate movement and coagulation action where the nitrate in the SOX trap catalyst (11) moves to and coagulates at the surface of the SOX trap catalyst (11) is promoted. Due to this nitrate movement and coagulation action, SOX is removed while restoring the SOX trap rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.