Patent ID: 6503862
Filing Date: 2003-01-07
Classification: B01D,B01J,F01N,Y02T

Abstract:
An exhaust gas purifying catalyst, comprising:a monolithic support having plurality of cells each of which has a polygonal sectional shape; a first layer containing heat resisting inorganic material formed on the monolithic support, the first layer being configured to form inner wall sectional shapes of the cells into substantially circular shapes; a second layer containing hydrocarbon adsorbent formed on the first layer, wherein the first layer and the second layer are configured to obtain a ratio Lmax/Lmin of a thickest portion (Lmax) of the second layer at corner portions of the cells to a thinnest portion (Lmin) at flat portions of the cells being in a range of 1 to 10, and the second layer having a thickness of 10 to 650 &mgr;m; and a third layer containing a metal-based catalyst formed on the second layer.