| abstract |
An exhaust gas purification catalyst having an exhaust gas purification performance superior to that of a conventional exhaust gas purification catalyst, and a method for producing the same are provided. An exhaust gas purifying catalyst used for purifying HC, CO, and NOx contained in exhaust gas discharged from an internal combustion engine, comprising a noble metal element, an alkali metal element, an alkaline earth metal element, and a rare earth element And a composite oxide particle containing at least one element selected from the group consisting of an element and a transition metal element. The composite oxide particle has a content of the noble metal element gradually from the center to the surface. It is characterized by having an increasing slope structure. [Selection figure] None |