Patent ID: 8449643

Claim:
An exhaust gas cleaner that purifies exhaust gas emitted from an internal combustion engine, the exhaust gas cleaner comprising: a gas channel in which exhaust gas flows; and a particulate filter that is provided in the gas channel and in which a plurality of pores are formed, wherein an inlet surface of the particulate filter, which the exhaust gas contacts, is covered over a substantial entirety thereof with a microporous body formed by micropores having a pore diameter smaller than the pores, wherein the microporous body has a porosity that is higher than the particulate filter and is at least 45%, at least 95% of the micropores of the microporous body have a pore diameter value measured by mercury porosimetry of less than 7 μm, and the thickness of the microporous body is at least 0.1 μm and no more than 50 μm, and wherein the microporous body includes a carrier composed of an oxide with an oxygen storage/release property containing at least one element selected from the group consisting of alkali earth metal elements, transition metal elements, periodic group 12 elements, and periodic group 13 elements, and a catalyst containing Ag and at least one transition metal element selected from the group consisting of Ru, Pd, and Pt, where the catalyst is supported on the carrier.