Patent ID: 7210288

Claim:
An installation for aftertreatment of exhaust gas generated by a combustion device, said installation comprising the following components: a nitrogen oxide storage catalytic converter configured for temporarily storing nitrogen oxides contained in the exhaust gas during adsorption operating phases with a lean exhaust gas air ratio, and releasing and reducing stored nitrogen oxides, during regeneration operating phases with a rich exhaust gas air ratio; an SCR catalytic converter arranged downstream of the nitrogen oxide storage catalytic converter, said SCR catalytic converter being configured to receive and store ammonia generated by the nitrogen oxide storage catalytic converter, and to reduce nitrogen oxides in the exhaust gas with the stored ammonia; a particulate filter arranged upstream of the SCR catalytic converter and downstream of the nitrogen oxide storage catalytic converter; and a reducing agent supplying device coupled to feed reducing agent into the exhaust gas downstream of the combustion device and upstream of the nitrogen oxide storage catalytic converter such that during lean-burn operation of the combustion engine, an exhaust gas air ratio upstream of the nitrogen oxide storage catalytic converter is lowered into a rich range, for performing regeneration of the nitrogen oxide storage catalytic converter.