Exhaust Gas Aftertreatment Installation and Method

An exhaust gas aftertreatment method for purifying an exhaust gas of a diesel engine of a motor vehicle, said method comprising:

• temporarily storing nitrogen oxides contained in the exhaust in a nitrogen oxide storage catalytic converter during adsorption operating phases;
• releasing stored nitrogen oxides from the nitrogen oxide storage catalytic converter during regeneration operation phases, and thereby generating ammonia;
• temporarily storing generated ammonia in an SCR catalytic converter arranged downstream of the nitrogen oxide storage catalytic converter;
• using the stored for nitrogen oxide reduction in the SCR catalytic converter;
• operating the combustion device under lean-burn conditions of the engine during adsorption operating phases;
• during lean-burn conditions of the engine oxidizing carbon monoxide and hydrocarbons contained in the exhaust gas in an oxidizing catalytic converter arranged as a first exhaust gas aftertreatment component, as seen in the direction of flow of the exhaust gas;
• and
• operating the combustion device under rich-burn conditions during regeneration operating phases.