COMPOSITION FOR PURIFYING AN INTERNAL COMBUSTION ENGINE EXHAUST GASES

摘要

The invention concerns a composition for purifying exhaust gases of an internal engine capable of consuming fuel with lean air-fuel ratios, comprising means adsorbing 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 comprise at least a support and at least an active phase based on manganese and that furthermore, a reducing and/or a three-way catalyst function is incorporated in the NOx adsorbing composition.