Exhaust gas aftertreatment systems
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United States of America Patent
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Aug 16, 2005
Grant Date -
May 27, 2004
app pub date -
Nov 21, 2002
filing date -
Nov 21, 2002
priority date (Note) -
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Abstract
A system for effective NOx and particulate matter control in a diesel or other lean burn internal combustion engine is presented. The system includes a urea-based SCR catalyst having an oxidation catalyst coupled upstream of it and a particulate filter coupled downstream of the SCR catalyst. This system configuration results in improved NOx conversion due to fast SCR catalyst warm-up and higher operating temperatures. Additionally, placing the particulate filter last in this system configuration reduces tailpipe ammonia emissions as well as prevents any thermal damage to the SCR catalyst due to the particulate filter regeneration.
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