APPARATUS FOR TREATING EXHAUST GAS OF LEAN BURN INTERNAL COMBUSTION ENGINE COMPRISING OXIDATION CATALYST AND METHOD FOR RECOVERING THE OXIDATION ACTIVITY OF AN OXIDATION CATALYST

摘要

The apparatus includes a lean-burn internal combustion engine, an engine management means and an exhaust system for treating the exhaust gas of the engine, wherein the exhaust system comprises a first oxidation catalyst disposed on the first honeycomb monolith substrate, Wherein the catalyst comprises platinum supported on a first metal oxide support comprising at least one reducible oxide and wherein the first oxidation catalyst is substantially free of alkali and alkaline earth metals and the engine management means is intermittently And is arranged to control the lambda composition of the exhaust gas entering the oxidation catalyst by the rich lambda composition. Furthermore, a method of recovering the oxidative activity of an aged oxidation catalyst in the exhaust gas of a lean-burn internal combustion engine is described.