Catalytic method for selectively reducing nitrogen oxides
US5811067A · kind A · utility
3Cited by
10References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 14, 1997 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Mar 14, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for the catalytic removal of nitrogen oxides, methane and carbon monoxide out of oxygen-rich exhaust gases emitted from motors that may combust natural gas by contacting the exhaust gas with a zeolite of the NFI structure that contains palladium. The palladium containing zeolite has been activated under oxygen prior to use by calcining the palladium containing zeolite at about 300.degree. C. for about one hour, then calcining the palladium containing zeolite at about 500.degree. C. for about one hour, and cooling the palladium containing zeolite to about 300.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.