Patent ID: 6444610
Filing Date: 2002-09-03
Classification: B01D,B01J,F01N

Abstract:
An exhaust gas purifying catalyst, comprising:a monolithic support including a plurality of cells whose sectional shape is a substantially regular N-polygon, wherein N is a natural number of more than or equal to 3; a hydrocarbon adsorbent layer being formed on the cells of the monolithic support and containing zeolite as a main component, a ratio Rc/Rf in a cell sectional shape being set to Rc/Rf&lE;1.7, where Rc is a distance from a center of gravity to an inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity of the regular N-polygon in the cell sectional shape to a corner of the N-polygon, and Rf is a distance from the center of gravity to the inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity perpendicularly to respective sides of the regular N-polygon; a metal-based catalyst layer being formed on the hydrocarbon adsorbent layer and containing at least one noble metal selected from the group consisting of platinum, palladium, and rhodium.