Method for purifying exhaust gas from internal combustion engines
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United States of America Patent
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Jul 22, 2003
Issued Date -
N/A
app pub date -
Jul 7, 1999
filing date -
Oct 25, 1996
priority date (Note) -
Expired
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Abstract
A catalyst being formed of a porous supporter supporting alkali metals, Ti and noble metal, or further supporting at least one of rare earth metal and magnesium, being disposed in a flow passage of the internal combustion engine, and being used to purify NOx contained in the exaust gas. The above catalyst has excellent NO.sub.x resistance not only to the exaust gas burnt with the stoichiometric air-to-fuel ratio or rich condition, but to the exhaust gas burnt with the lean condition, and furthermore has a high resistivity to poisoning of SOx slightly contained in the fuel.
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