Patent ID: 7655064

Claim:
A filter for purifying an exhaust gas containing particulate matter and nitrogen monoxide, comprising: a molding formed by stacking up pairs of a porous corrugated plate and a porous flat plate such that the ridge lines of the porous corrugated plates alternately cross perpendicularly, and either one side surface or two mutually-adjoining surfaces of the molding are sealed, and perpendicularly-crossing said porous corrugated plate ridge lines so that exhaust gas in-flow passages and exhaust gas out-flow passages are respectively formed between said porous corrugated plates via the porous flat plates; and wherein an exhaust gas purifying catalyst is supported on the porous corrugated plates and the porous flat plates to form said exhaust gas in-flow passages, said catalyst being an oxidizing catalyst which oxidizes nitrogen monoxide in the exhaust gas to nitrogen dioxide which then oxidizes the particulate matter deposited on the porous flat plates to carbon dioxide and nitrogen monoxide, wherein the nitrogen monoxide further reacts with nitrogen dioxide and ammonia to produce nitrogen gas and water.