Urea pyrolysis chamber and process for reducing lean-burn engine NOx emissions by selective catalytic reduction
US6203770A · kind A · utility
72Cited by
12References
3Claims
0Family size
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Key dates
| Filing date | Aug 20, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Aug 20, 2019 |
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.