| 摘要 |
PROBLEM TO BE SOLVED: To prevent the CO poisoning and sulfur poisoning of palladium used as an exhaust gas cleaning catalyst and to enhance the catalytic performance of the palladium. SOLUTION: The objective exhaust gas cleaning catalyst contains an oxide carrier, an inorganic oxide having a higher electronegativity than palladium oxide and palladium oxide. Preferably the inorganic oxide is tungsten trioxide, antimony tetroxide or molybdenum trioxide, the oxide carrier is coated with the inorganic oxide and the palladium oxide is present on the inorganic oxide. The catalyst is used as a promoter for an occlusion reduction type NOx removal catalyst containing a catalyst component such as platinum or gold and an occluding agent such as an alkali metal. |
