LAYERED CATALYST COMPOSITE

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PROBLEM TO BE SOLVED : To provide a three-way catalyst system of a layered catalyst composite having a capability of simultaneously oxidizing a hydrocarbon and carbon monoxide and reducing nitrogen oxides into nitrogen. SOLUTION : In a structural design of the layered catalyst composite, there are a first layer and a second layer made to coexist. The first layer comprises a first support; at least one first palladium component and an oxygen storage component in intimate contact with the palladium component; optionally another first platinum group metal component; a zirconium component; at least one first alkaline earth metal component and at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components. The second layer comprises a second support; at least one second palladium component; optionally another second platinum group metal component; at least one second alkaline earth metal component; at least one second rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components and a zirconium component may be contained.