Exhaust gas purifying apparatus for internal combustion engine

摘要

An exhaust gas purifying apparatus for an internal combustion engine (1) including an ammonia generating device (3) and a NOx removing device (4). The ammonia generating device (3) is provided in an exhaust system of the engine, and generates ammonia by a reaction of NOx and reducing components in exhaust gases when the exhaust gases are in a reducing state. The NOx removing device (4) is provided downstream of the ammonia generating device (3), and adsorbs NOx in the exhaust gases when the exhaust gases are in an oxidizing state. The NOx removing device (4) reduces the adsorbed NOx to generate ammonia and retains the generated ammonia when the exhaust gases are in the reducing state.