EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce both particulate and NOx, even in a vehicle of operation form in which an operational status of low exhaust temperature is continued for a long time.

SOLUTION: An oxidation catalyst 16 is installed in a front stage of a particulate filter 11 disposed along an exhaust pipe 9, and a NOxadsorption catalyst 17 is disposed in a front stage of the oxidation catalyst 16. The NOxadsorption catalyst simultaneously adsorbs NOxin exhaust gas 7 and carbon hydride under a low exhaust temperature condition, and reduces and cleans NO2in the adsorbed NOxby reacting the NO2with suboxide of hydrocarbon as oxidation product of hydrocarbon.

COPYRIGHT: (C)2008,JPO&INPIT