Process for lowering nitrogen oxide levels in combustion engine exhaust gas
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United States of America Patent
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Dec 14, 1999
Grant Date -
N/A
app pub date -
Dec 22, 1997
filing date -
Dec 21, 1996
priority date (Note) -
Expired
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Abstract
A process is disclosed for lowering nitrogen oxide levels in combustion engine exhaust gas by a reduction catalyst and by controlling the exhaust gas temperature upstream from the catalyst to a constant value, at which the catalyst exhibits maximum conversion for nitrogen oxides. It is possible to maintain maximum conversion over a wide range of engine outlet temperatures of the exhaust gas.
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