Patent ID: 8220251

Claim:
An apparatus comprising a diesel 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 in one of the following arrangements: (i) the Pt component is disposed in a zone on an upstream end of the substrate monolith and the Pd component is disposed in a zone on a downstream end of the substrate monolith; and (ii) the Pt component and the Pd component are disposed on a downstream end of the substrate monolith and an upstream end of the substrate monolith comprises a further Pt component which is substantially free from Pd.