Purification of exhaust gases
US6775972B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Nov 27, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2240/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A system for treating exhaust gases including NO, nitrogen and particulate matter comprises: a catalyst for generating NO2 from the NO; a plasma generator for generating at least one of: (1) NO2 from the NO or nitrogen or both; and (2) ozone; and a filter for trapping a desired proportion of the particulate matter which is combusted with at least one of NO2 or ozone. Methods for increasing levels of NO2 in an exhaust system to combust trapped particulate matter involve oxidising NO to NO2 over an oxidation catalyst at an optimum temperature range and using a plasma generator to generate NO2 from NO or N2. Reducing exhaust gas emissions is achieved by trapping the particulate matter and combusting it by reaction with NO2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.