Urea pyrolysis chamber and process for reducing lean-burn engine NO.sub.x emissions by selective catalytic reduction
US5968464A · kind A · utility
71Cited by
1References
13Claims
0Family size
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Key dates
| Filing date | May 12, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | May 12, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Urea is pyrolyzed in a chamber designed to facilitate gasification of the urea by pyrolysis with conversion of urea to ammonia and isocyanic acid (HNCO) with water vapor and carbon dioxide. The product gases are introduced into exhaust gases from a lean-burn engine, preferably upstream of a turbocharger. The exhaust gases are then contacted with an SCR catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.