EXHAUST GAS PURIFICATION CATALYST

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas purification catalyst capable of exhibiting sufficient purification performance even under a high Ga condition.SOLUTION: There is provided an exhaust gas purification catalyst having a substrate and a catalyst coating layer formed on the substrate in which the catalyst coating layer contains catalyst particles having different compositions between an exhaust gas-upstream region occupying a range from the end on the exhaust gas-upstream side of the catalyst to 40-60% of the entire length of the substrate and a downstream-side region, which is the remaining region of the catalyst coating layer, wherein the exhaust gas-downstream side region includes many voids and further a certain portion or more of all the voids is composed of pores having a high aspect ratio of 5 or more, thereby improving the purification performance of the catalyst.SELECTED DRAWING: Figure 17