COMPOSITE OXIDE FOR CATALYST FOR EXHAUST GAS PURIFICATION, PROCESS FOR PRODUCING THE SAME, COATING COMPOSITION FOR CATALYST FOR EXHAUST GAS PURIFICATION, AND FILTER FOR DIESEL EXHAUST GAS PURIFICATION

摘要

An oxidation catalyst is provided with which PMs contained in the exhaust gas discharged from a diesel engine can be burned at low temperatures and which is less deteriorated by the heat generation caused by PM combustion (that is, has high heat resistance). A composite oxide for the catalyst for exhaust gas purification is provided which is constituted of Ce, Bi, R, R', and oxygen and which, when the molar ratio among Ce, Bi, R, and R' is expressed by Ce:Bi:R:R'=(1-x-y-z):x:y:z, then the following relationships are satisfied: 0