Exhaust system comprising exotherm-generating catalyst

摘要

An apparatus comprising a compression ignition engine and an exhaust system therefor comprising at least one exhaust system component for treating exhaust gas and means for generating an exotherm for heating the at least one exhaust system component, which exotherm generating means consisting essentially of a catalyst and means for injecting hydrocarbon into exhaust gas for combustion on the catalyst, which catalyst consisting essentially of both a palladium (Pd) component and a platinum (Pt) component, and an optional support material, disposed on a substrate monolith.

主权项

1. A method of heating at least one component in an exhaust system of a diesel engine, which method comprising generating an exotherm for heating the at least one exhaust system component by contacting a catalyst with an exhaust gas comprising an increased concentration of hydrocarbon relative to the concentration of hydrocarbon present in the exhaust gas during normal operating conditions, wherein the catalyst consists essentially of a palladium (Pd) component and a platinum (Pt) component, a support material and a NOx absorber comprising an oxide of an alkaline-earth metal, disposed on a substrate monolith, wherein the palladium (Pd) component and the platinum (Pt) component are both supported on the same support material.