EXHAUST GAS CLEANING CATALYST AND EXHAUST GAS CLEANING DEVICE FOR VEHICLE PROVIDED WITH THE SAME

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PROBLEM TO BE SOLVED : To provide an exhaust gas cleaning catalyst exhibiting a sufficient performance even during low-temperature (400°C or lower) operation at starting of an automobile or idling by enhancing activity of a noble metal itself and preventing a reduction in activity at high temperature. SOLUTION : A composite oxide of a rational formula, i.e., Ln1-aXaAl1-bZbO3 (Ln : a rare-earth element, X : an alkaline earth metal, Z : a 2-5 group element or a 12-14 group element, 0.02≤a≤0.30, and 0.02≤b≤0.30) carries Pd. COPYRIGHT : (C)2006, JPO&NCIPI