Mitsui Minings & Melting Co., Ltd.

Yu Sakurada

Yoshinori Endo

Hiroki Kurihara

Yusuke Nagai

Shingo Akita

Takeshi Nabemoto

A substrate () of an exhaust gas purification catalyst () includes inflow-side cells (), outflow-side cells (), and porous partition walls (), each porous partition wall separating the cells () from each other. A first catalyst portions () is provided at least on a portion of a side of the partition wall () that faces the inflow-side cell (), the portion being located on an upstream side in an exhaust gas flow direction, and a second catalyst portion () is provided at least on a portion of a side of the partition wall that faces the outflow-side cell, the portion being located on a downstream side in the exhaust gas flow direction. A first pore volume is greater than a second pore volume, where the first pore volume is a pore volume of pores with a pore size of 10 &#x3bc;m to 18 &#x3bc;m, as measured on the first catalyst portions () and the partition walls () within a region where the first catalyst portions () are provided, and the second pore volume is a pore volume of pores with a pore size of 10 &#x3bc;m to 18 &#x3bc;m, as measured on the second catalyst portions () and the partition walls () within a region where the second catalyst portions () are provided. The first catalyst portion () exhibits the peak top of the pore size at between 20 nm and 500 nm.

Exhaust gas purification catalyst

A substrate () includes an inflow-side cell (), an outflow-side cell (), and a porous, gas-permeable partition wall () that separates the inflow-side cell () and the outflow-side cell () from each other, and also includes a first catalyst portion () that is provided on a side of the partition wall () that faces the inflow-side cell () at least at a portion in upstream side in an exhaust gas flow direction, and a second catalyst portion () that is provided on a side of the partition wall that faces the outflow-side cell at least at a portion in downstream side. With respect to a pore volume of pores with a pore size of 10 to 18 &#x3bc;m, when a measured value of the pore volume in the first catalyst portion () and the partition wall () within a region where the first catalyst portion () is provided is defined as a first pore volume, and a measured value of the pore volume in the second catalyst portion () and the partition wall () within a region where the second catalyst portion () is provided is defined as a second pore volume, the first pore volume is greater than the second pore volume. A catalytically active component contained in the first catalyst portion () and a catalytically active component contained in the second catalyst portion () are of different types.

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Saitama, Japan

Yu Sakurada