COMPOSITE OXIDE FOR EXHAUST GAS CLEAN-UP CATALYST, EXHAUST GAS CLEAN-UP CATALYST, AND DIESEL EXHAUST GAS CLEAN-UP FILTER

摘要

To provide an oxidation catalyst capable of burning PM of diesel engine exhausts gas at a low temperature, and hardly subjected to poisoning due to sulfur oxide. A composite oxide contains Ce, Bi, and M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba) and oxygen, and is manufactured, with a molar ratio of Ce, Bi, M expressed by Ce:Bi:M = (1 - x - y):x:y, satisfying 0 x ≤ 0.4, and 0 y ≤ 0.4. This composite oxide is suitable as a PM combustion catalyst, and is hardly subjected to poisoning due to sulfur oxide.