System for NOx reduction in exhaust gases
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United States of America Patent
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-
Oct 19, 2004
Grant Date -
N/A
app pub date -
Jan 9, 2001
filing date -
Feb 6, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Selective catalytic reduction of NO.sub.x in combustion gases, especially from diesel engines, utilizes a system incorporating an oxidation catalyst to convert at least a portion of NO to NO.sub.2, a particulate filter downstream of the oxidation catalyst, a source of reductant such as NH.sub.3 or urea for injection downstream of the particulate filter, and an SCR catalyst located downstream of the point of injection of the reductant. Considerable improvements in NO.sub.x conversion are observed.
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