System for exhaust gas purification and method for exhaust gas purification using said system

A system for exhaust gas purification disposed in an exhaust pipe of an internal combustion engine, comprising:

• a catalyst giving an excellent light-off performance at low temperatures, comprising a carrier and a catalyst layer supported thereon, the catalyst layer comprising a precious metal and a substance having at least one of an electron donatability and a nitrogen dioxide absorbability and releasability, and
• optionally an adsorbent comprising a carrier and an adsorbent layer having a hydrocarbon adsorbability, supported on the carrier.

A system for exhaust gas purification disposed in an exhaust pipe of an internal combustion engine, comprising:

• a catalyst giving an excellent light-off performance at low temperatures, comprising a carrier and a catalyst layer supported thereon, the catalyst layer comprising a precious metal and a substance having at least one of an electron donatability and a nitrogen dioxide absorbability and releasability, and
• optionally an adsorbent-catalyst comprising a monolithic carrier, an adsorbent layer having a hydrocarbon adsorbability and a catalyst layer having at least one of a three-way catalytic activity and an oxidizing ability, the adsorbent layer and the catalyst layer being separately supported on the monolithic carrier in at least part of the cross sections of the adsorbent-catalyst perpendicular to the flow direction of exhaust gas.