EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

In an internal combustion engine, an NO X selective reducing catalyst (15) is arranged inside an engine exhaust passage, an oxidation catalyst (13) is arranged upstream of the NO X selective reducing catalyst (15), and an NO X adsorption catalyst (12) is arranged upstream of the oxidation catalyst (13). The NO X adsorption catalyst (12) has a property of releasing NO X when the temperature rises and a property of trapping the SO X contained in the exhaust gas. The inflow of SO X into the oxidation catalyst (13) is suppressed by the NO X adsorption catalyst (12) to prevent the NO released from the NO X adsorption catalyst (12) being oxidized to NO 2 at the oxidation catalyst (13) from being obstructed by SO X .