| 摘要 |
PROBLEM TO BE SOLVED: To produce an exhaust gas cleaning catalyst capable of being produced advantageously from an aspect of cost with high work efficiency, excellent in high temp. durability and capable of also acting effectively even at relatively low temp. SOLUTION: In an exhaust gas cleaning catalyst wherein a coating layer having a two-layered structure consisting of first and second coating layers is formed on a heat-resistant support carrier so that the first coating layer is directly carried and formed on the support carrier, Pd and alumina are added to the first coating layer and Pd is carried on a part or all or alumina and at least one of Pt and Rh and a Zr-Ce composite oxide represented by the general formula Zr1-(x+y)CexMyO2-z (wherein M is an alkaline earth metal element or a rare earth element excepting Zr and Ce, Zr is 0.5<=Zr<=0.9 and Ce is O<Ce<0.3) are added to the second coating layer and at least one of Pt and Rh is carried on a part or all of the Zr-Ce composite oxide. |
