| abstract |
A catalyst for efficiently purifying exhaust gas generated mainly in a rich environment from stoichiometry is provided. An exhaust gas purification catalyst for an internal combustion engine that purifies exhaust gas generated by stoichiometric combustion or rich combustion, comprising two or more elements selected from the group consisting of cerium and zirconium, and having a pyrochlore structure A catalyst for purifying exhaust gas of an internal combustion engine, characterized by containing one or more base metals selected from the group consisting of a metal oxide partially or entirely and copper or the like. [Selection] Figure 2 |