| 摘要 |
PURPOSE:To provide a catalyst composition generating no lowering catalytic activity even in a reducible atmosphere at high temp. of 200 deg.C or higher and excellent in durability. CONSTITUTION:A catalyst composition consists of a perovskite type multicomponent oxide wherein iron is contained in a part of the B-site of a chemical formula ABO3, rare earth metal oxide, at least one oxide among zirconium oxide and aluminum oxide and at least one noble metal and has excellent durability shown by Fig 1. |
