Staged reductant injection for improved NO.sub.x reduction
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United States of America Patent
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Oct 3, 2000
Grant Date -
N/A
app pub date -
Nov 13, 1998
filing date -
Nov 13, 1998
priority date (Note) -
Expired
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Abstract
An external reductant for an SCR vehicular NO.sub.x emission control system is selectively injected to SCR catalysts which are only at catalytically active temperatures thereby avoiding reductant absorption in catalytically unactive catalysts and improving conversion response time.
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