| 摘要 |
PROBLEM TO BE SOLVED: To improve the NOX purification capacity and heat resistance of an exhaust gas purification catalyst in which palladium, rhodium, and barium are supported on a porous carrier by a method in which rhodium and barium are supported with at least parts of them separated from each other. SOLUTION: In a ternary catalyst for purifying automobile exhaust gas, a coat layer 2 is formed on the base material 1 of a heat resistant carrier, catalyst metal selected from platinum group elements including platinum, rhodium, and palladium is supported. In consideration of the hindrance of the catalytic effect of rhodium by the contact with barium, they are supported on a porous carrier so that parts of them are separated from each other. In this way, the acceleration of oxygen poisoning of rhodium by barium is hindered, improving the NOX purification capacity and heat resistance of the catalyst. Besides, barium keeps the oxidization condition of palladium to prevent the sintering of palladium. |
