DEVICE FOR PURIFYING EXHAUST GASES FOR AN INTERNAL COMBUSTION ENGINE

摘要

The invention concerns a device for purifying an internal combustion engine exhaust gases comprising an internal combustion engine capable of consuming fuel with lean air-fuel mixture ratios, means for adsorbing NOx arranged in the engine exhaust line, said means being of the type which adsorb the NOx present in the exhaust gases in the presence of excess oxygen and which release the adsorbed NOx when the oxygen concentration of the exhaust gases decreases. The invention is characterised in that the NOx adsorbing means do not contain any composition capable of acting as NOx reducing catalyst and in particular no precious metal and a three-way catalyst is installed in the exhaust line downstream of the NOx adsorbing means.