| 摘要 |
PURPOSE:To obtain a catalyst composition not lowered in its catalytic activity even in a reductive atmosphere at high temp. of 500 deg.C or higher and excellent in durability. CONSTITUTION:A catalyst composition excellent in durability is obtained from a composition consisting of perovskite multicomponent oxide containing a rare- earth element, rare earth oxide, aluminum oxide, vanadium oxide, iron oxide and one or more kind of noble metals. |
