Patent ID: 6338244
Filing Date: 2002-01-15
Classification: B01D,F01N,F02D

Abstract:
An exhaust gas purification system for purifying the exhaust gas of several separately controllable internal-combustion sources, comprising:an ammonia generating catalyst for generating ammonia from nitrogen oxides contained in the exhaust gas to be purified; a nitrogen oxide adsorption catalyst for intermediate storage of nitrogen oxides contained in the exhaust gas to be purified; and a nitrogen oxide reducing catalyst arranged downstream of the ammonia generating catalyst, for reducing nitrogen oxides contained in the exhaust gas to be purified, while using the ammonia as the reducing agent which is generated in the ammonia generating catalyst, wherein the ammonia generating catalyst is arranged in an exhaust pipe branch pertaining to a first part of the internal-combustion sources and the nitrogen oxide adsorption catalyst is arranged upstream of the ammonia generating catalyst, which exhaust pipe branch leads to the nitrogen oxide reducing catalyst, and wherein at least one additional exhaust pipe branch is assigned to the other internal-combustion sources and leads to the nitrogen oxide reducing catalyst, while bypassing the ammonia generating catalyst and the nitrogen oxide adsorption catalyst.