Process for removing nitrogen oxides in exhaust gases to nitrogen
US5336476A · kind A · utility
24Cited by
11References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 27, 1992 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Oct 27, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for reducing nitrogen oxides to nitrogen from exhaust gases is disclosed, which involves bringing an exhaust gas containing nitrogen oxides into contact with at least one catalyst from proton-type zeolites, zeolites of an alkali metal exchanged form and acidic metal oxides, by reaction with a hydrocarbon or an oxygen-containing organic compound in an oxidizing atmosphere containing excess oxygen. A process which further involves bringing the exhaust gas into contact with an oxidizing catalyst subsequent to the above process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.