Reduction of NO.sub.x in the exhaust gases from internal combustion engines containing excess oxygen
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Dec 14, 1992
filing date -
Dec 14, 1992
priority date (Note) -
Expired
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Abstract
Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is provided by at least two catalysts in sequence, each capable of reducing nitrogen oxides within a particular range of engine operating temperatures. Oxidation of the remaining reducing gases is also accomplished.
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