Diesel engine exhaust gas purification method
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United States of America Patent
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-
Aug 31, 1999
Grant Date -
N/A
app pub date -
Nov 19, 1997
filing date -
Jun 6, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A process for the improved conversion of NO.sub.x in the exhaust gases from a light diesel engine using lean NO.sub.x catalyst converter in the exhaust system. The process is characterized in that unburned hydrocarbons are adsorbed into an adsorbent in the catalytic converter at temperatures below 190.degree. C. during cooler parts of the operating cycle, and are desorbed in the temperature range of 198.degree. to 200.degree. C. during hotter parts of the operating cycle. The desorbed hydrocarbons are combined with unburned hydrocarbons in the exhaust to form a composition stream having a higher amount of hydrocarbons than either constituent stream which are then oxidized at the same time as at least a portion of the NO.sub.x is catalytically reduced to form N.sub.2.
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