System for treating a gas stream
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United States of America Patent
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Jan 31, 2012
Grant Date -
Aug 4, 2011
app pub date -
May 29, 2009
filing date -
May 30, 2008
priority date (Note) -
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Abstract
A system for treating a gas stream containing nitrogen oxides (NO.sub.x) and particulates flowing in the system comprises means for injecting a source of ammonia (NH.sub.3) or urea (CO(NH.sub.2).sub.2) into a flowing exhaust gas upstream of a precious metal-free particulate trap, a selective catalytic reduction catalyst disposed downstream of the particulate trap and a source of ammonia or urea.
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