METHOD FOR CLEANING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning method by which exhaust gas can be purified by oxidizing methane even at low temperature and the lowering degree of methane oxidizing activity of a catalyst can be made small even at high temperature. SOLUTION: A catalyst obtained by depositing at least Pd on a carrier consisting of alumina-zirconia manufactured by a coprecipitation method is used for cleaning the exhaust gas the oxidizing component of which is more excessive than the reducing component and which is in a lean atmosphere. Through the reason is not clarified, hydrocarbon including methane can be oxidized efficiently even at a low temperature and the high temperature durability of the catalyst is enhanced remarkably.