Alloyed metal catalysts for the 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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Nov 2, 1999
Issued Date -
N/A
app pub date -
Jun 5, 1998
filing date -
Jun 1, 1994
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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 oxygen in substantial excess of stoichiometric is provided by catalysts containing platinum alloyed with cobalt, nickel, copper, rhodium, palladium, silver or gold. Alloying is accomplished by thermal treatment or by colloidal methods. The catalysts are capable of reducing nitrogen oxides (NO.sub.x) within a predetermined range of engine operating temperatures.
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