Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas internal combustion engine
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United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
Dec 10, 1998
filing date -
Jun 10, 1996
priority date (Note) -
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Abstract
An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which exhaust gas containing NO.sub.x gas passes, and a catalyst disposed in the exhaust gas duct such that it contacts the exhaust gas. The catalyst chemically adsorbs NO.sub.x when a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NO.sub.x, adsorbed NO.sub.x is catalytically reduced in the presence of a reducing agent when the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent.
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