Patent ID: 6667018
Filing Date: 2003-12-23
Classification: B01D,B01J,Y02T

Abstract:
A catalyst-adsorbent for purification of exhaust gases, comprising a monolithic carrier and a catalyst-adsorbent layer formed thereon, said catalyst-adsorbent layer comprising a catalyst for reduction of carbon monoxide, hydrocarbons and nitrogen oxides emitted from an internal combustion engine and an adsorbent for reduction of hydrocarbons emitted during cold start of the engine, said catalyst comprising catalyst particles each including a heat-resistant inorganic oxide and at least one noble metal selected from the group consisting of Pt, Pd and Rh, loaded thereon, said catalyst at least containing catalyst particles each comprising a heat-resistant inorganic oxide and 2-30% by weight, based on said oxide, of only Pd loaded thereon, wherein at least part of said Pd-loaded catalyst particles are in the vicinity of the outer surface of said catalyst-adsorbent layer and the content of Pd in the catalyst is 50 to 300 g/ft3 of the catalyst-adsorbent, and said adsorbent comprising zeolite adsorbent particles.