| 摘要 |
The subject of the present invention is to provide a novel exhaust purification catalyst. The catalyst has the following composition: a catalystic layer which is composed of at least two layers enables a Pd to be loaded on a lower-layer side, and can further improve the oxidative activity of Co. The solution of the invention is to provide an exhaust purification catalyst. The exhaust purification catalyst is composed of a catalytic layer A and a catalytic layer B on the substrate. The catalytic layer A contains Pd and OSC materials and an inorganic porous body. The catalytic layer B contains Pt and/or Rh and an inorganic porous body, and is arranged on the upper-layer side of the catalytic layer A. the exhaust purification catalyst is characterized in that the catalytic layer A contains one or two more transition metals selected from a group of Co, Ni, Mn, Cu and Fe. |
