US Patent 10159935 Exhaust gas purification catalyst

An exhaust gas purification catalyst having an excellent exhaust gas purification ability while reducing the increase in pressure loss. Exhaust gas purification catalyst includes entrance cell, exit cell, and a wall-flow substrate having partition wall to separate these cell, a catalytic layer formed from exhaust inlet-side ends in the extending direction in sections of the interior of partition wall facing entrance cell, and a catalytic layer formed on the surface of partition wall facing exit cell from exhaust outlet-side ends in the extending direction of partition wall, having a length shorter than the entire partition wall length.