| abstract |
A method for operating an exhaust aftertreatment device of an internal combustion engine, wherein the exhaust aftertreatment device comprises a nitrogen oxide storage catalyst and at least one arranged downstream of the nitrogen oxide storage catalytic converter SCR catalyst. In an oxidizing composition of an exhaust gas of the internal combustion engine, nitrogen oxides and sulfur oxides are removed from the exhaust gas in the nitrogen oxide storage catalyst and stored therein. A desulfation of the nitrogen oxide storage catalyst is carried out by adjusting a reducing composition of the exhaust gas and increasing an exhaust gas temperature, so that sulfur oxides stored in the nitrogen oxide storage catalyst are released with formation of hydrogen sulfide. Control unit for an internal combustion engine, wherein the control unit is adapted to perform a desulfation of the nitrogen oxide storage catalyst from time to time, and internal combustion engine with an exhaust aftertreatment device, wherein the exhaust aftertreatment device comprises a nitrogen oxide storage catalyst and at least one downstream of the nitrogen oxide storage catalytic converter arranged SCR catalyst , wherein a control unit is further provided. |