BASE METAL EXHAUST GAS CONTROL APPARATUS AND BASE METAL EXHAUST GAS CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

A base metal exhaust gas control apparatus for an internal combustion engine includes a basic structure having a first-stage base metal catalyst that oxidizes HC and CO, and a second-stage base metal catalyst that reduces NOx. The first-stage base metal catalyst oxidizes HC more efficiently than it oxidizes CO.