Method for purifying exhaust gas
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United States of America Patent
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Jan 17, 1995
Issued Date -
N/A
app pub date -
Mar 28, 1994
filing date -
Dec 18, 1990
priority date (Note) -
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Abstract
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons, comprising (i) a zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio of at least 15 and (ii) (a) cobalt, (b) an alkaline earth metal and (c) silver, or nickel and/or zinc, or platinum and/or manganese, or copper and/or rhodium, incorporated thereinto.
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