Device for the treatment of the exhaust gases of a compression-ignition engine comprising a catalyst and a nitrogen oxide adsorber placed in the exhaust manifold

摘要

The device comprises in a cylindrical case ( 3 ) of an exhaust manifold ( 2 ) of an engine, a catalyst body ( 12 ) in a centre position, and means ( 14, 15 ) for adsorbing nitrogen oxides contained in the exhaust gases of the engine in a peripheral disposition around the catalyst body ( 12 ). Preferably, the catalyst body is disposed in a pipe ( 8 ) constituting an end part of an exhaust line ( 8 a) and the adsorbing means ( 14, 15 ) is disposed in an annular space provided between the exhaust pipe ( 8 ) surrounding the catalyst body ( 12 ) and the case ( 3 ) of the manifold ( 2 ). The device permits limiting the discharges of nitrogen oxides of the exhaust gases in all the phases of operation of the engine.