EXHAUST GAS PURIFICATION APPARATUS FOR INTERNAL COMBUSTION ENGINE AND CATALYST SUPPORTING METHOD FOR SUPPORTING CATALYST ON PARTICULATE FILTER OF EXHAUST GAS PURIFICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To remove fine particles collected by a particulate filter completely from the particulate filter.;SOLUTION: The exhaust gas purification apparatus for internal combustion engine is provided with the particulate filter 10 having an exhaust gas flow-in passage 20 and an exhaust gas flow-out passage 21 which are formed by being divided by a partition wall composed of a porous material and constituted so that an exhaust gas flowing-in to the exhaust gas flow-in passage is passed through fine pores 25 of the partition wall 24 and flows-out to the exhaust gas flow-in passage. A 1st catalytic layer 26 having a support composed of a porous material and a catalyst supported on the support is formed on the wall surface of the partition wall and wall surfaces with which the fine pores are formed to be divided. A 2nd catalytic layer 27 having a support which has fine pores each having a larger porosity than that of the partition wall and a larger average fine pore diameter than that of the fine pores of the partition wall and a catalyst supported on the support is formed on the 1st catalytic layer formed on the wall surface of the partition wall with which the exhaust gas flow-in passage is formed to be divided.;COPYRIGHT: (C)2003,JPO