초록 ▼

An exhaust purification catalyst for a compression ignition engine comprises a carrier substrate and a metal-carrying layer which carries catalytic metal formed on the surface of the carrier substrate, and is characterized in that a diffusion restriction layer having a thickness smaller than 170 .mu

An exhaust purification catalyst for a compression ignition engine comprises a carrier substrate and a metal-carrying layer which carries catalytic metal formed on the surface of the carrier substrate, and is characterized in that a diffusion restriction layer having a thickness smaller than 170 .mu.m is provided on the surface of the metal-carrying layer opposite to the

대표청구항 ▼

1. An exhaust purification catalyst for a compression ignition engine comprising a carrier substrate, a porous metal-carrying layer which carries catalytic metal formed on the surface of said carrier substrate, and a porous diffusion restriction layer which has a thickness smaller than 170 .mu.m and

1. An exhaust purification catalyst for a compression ignition engine comprising a carrier substrate, a porous metal-carrying layer which carries catalytic metal formed on the surface of said carrier substrate, and a porous diffusion restriction layer which has a thickness smaller than 170 .mu.m and includes pores having sizes smaller than those of said metal-carrying layer provided on the surface of said metal-carrying layer opposite to said carrier substrate, and wherein a catalytic metal selected from the group consisting of alkali metals and alkaline earth metals which traps SO2 and has an oxidation power lower than that of said catalytic metal carried on said metal-carrying layer, is carried on said diffusion restriction layer.