ADSORPTIVE/CATALYTIC ELEMENT FOR EXHAUST GAS PURIFICATION, ADSORPTIVE ELEMENT, EXHAUST GAS PURIFICATION SYSTEM AND EXHAUST GAS PURIFICATION

摘要

PURPOSE:To make it possible to purify an organic substance contained in an exhaust gas efficiently by separating a hydrocarbon adsorptive layer from a catalytic layer having three-dimensional function or oxidation function in a direction at right angles with a gas flowing direction and in a certain cross-section, and causing these layers to be borne on a honeycomb structure partitioned by a diaphragm and with through holes arranged parallel to a gas flowing direction. CONSTITUTION:An exhaust gas purification adsorptive/catalytic element consists of an adsorptive layer 17 with a hydrocarbon adsorptive function and a catalytic layer 16 with three-dimensional function or oxidation function borne on a honeycomb structure 15 partitioned by a diaphragm and with through holes arranged substantially parallel to a gas flowing direction. The adsorptive layer 17 and the catalytic layer 16 are borne by a structure, being separated in a certain cross-section, in a direction at right angles with the gas flowing direction. Consequently, it is possible to purify a harmful substance contained in an exhaust gas blown out of an internal combustion engine, especially, HC generated in large quantities at the time of cold start.