| abstract |
The invention relates to a device and a method for purifying exhaust gases for an internal combustion engine, with a multi-flow exhaust gas system having, at least in individual regions, several partial exhaust gas lines, and in which a NO x storage catalytic converter device and a SCR catalytic converter device are located. According to the invention, the NO x storage catalytic converter device ( 7 ) and the SCR catalytic converter device ( 9 ) are arranged distributed on different partial exhaust gas lines ( 6, 8 ) such that for a nitrogen oxide-Filled nitrogen oxide store of the NO x storage catalytic converter device ( 7 ) for a specified time interval a defined amount of the exhaust gas flow ( 16 ) produced by substoichiometric rich operation of the internal combustion engine ( 2 ) for production of a reducing agent, in particular for producing ammonia, flows via the NO x storage catalytic converter device ( 7 ) to the SCR catalytic converter device ( 9 ), in which the produced reducing agent, in particular ammonia, can be stored. |