Waste gas purification facility with internal generate ammonia for the reduction of nitrogen oxide and method for the operation thereof

摘要

The present invention relates to a waste gas purification facility with a ammonia generation catalyst for the generation of ammonia from nitrogen oxides contained in the exhaust gas to be purified and a nitrogen oxide reduction catalytic converter arranged downstream of the same for the reduction of nitrogen oxides contained in the exhaust gas to be purified with the use of the ammonia produced as a reducing agent, and to a method for the operation thereof. Dollars a according to the invention, a is arranged upstream of the ammonia producing catalyst nitrogen oxide adsorption catalyst is provided, and / or the ammonia generation catalyst is arranged in an exhaust pipe branch, the only to a part of a plurality of separately controllable combustion sources, whereby the remaining combustion sources one or more further, by bypassing the ammonia producing catalyst for nitrogen oxide reduction catalytic converter are associated with the exhaust pipe branches leading. The exhaust pipe branch of the ammonia producing catalyst is associated with the part of the combustion sources is continuously or intermittently operated rich and / or the one or more, their exhaust gas of the nitrogen oxide adsorption catalyst incoming combustion sources are operated alternately lean and rich. Dollars a use, for example, for lean-burn otto - and diesel engines in motor vehicles.