Automobile exhaust gas cleaning catalyst - having palladium-rich region in catalyst layer near gas inlet end

摘要

A novel exhaust gas cleaning catalyst comprises a porous monolithic support (10) having a gas cleaning catalyst layer (11,12) formed on its surface and a Pd-bearing layer (13) formed in the catalyst layer at a region near the exhaust gas inlet end of the support, the Pd catalytic material being distributed in high concn. in the Pd-bearing layer (13). An exhaust gas cleaning system comprises, downstream of an exhaust gas manifold, a first converter contg. a catalyst for pretreating the exhaust gases, followed by a second converter contg. at least one catalyst.