High efficiency conversion of nitrogen oxides in an exhaust aftertreatment device at low temperature
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United States of America Patent
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Jun 1, 2004
Grant Date -
Feb 27, 2003
app pub date -
Aug 9, 2001
filing date -
Aug 9, 2001
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Abstract
A system and method for providing operating conditions that provide higher efficiency NOx reduction in a lean NOx catalyst coupled to a lean-burning internal combustion engine. A catalyst containing reductant is caused to attain a temperature greater than 300.degree. C. After a duration of about 10 seconds at the elevated temperature, the NOx conversion efficiency of the catalyst is increased in the 140-250.degree. C. temperature range.
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