EXHAUST EMISSION CONTROL DEVICE FOR ENGINE

摘要

PURPOSE:To reduce the generated quantity of smoke and SOx noxious to the durability of an engine and reduce the rate without reducing the EGR effect in an exhaust emission control device provided with an EGR passage for circulating part of the exhaust air from the exhaust passage of the engine to the intake passage. CONSTITUTION:The exhaust emission control device for an engine is provided with an oxidation catalyst 6 processing the unburnt constituent in the exhaust gas in an EGR passage 4, a reduction catalyst 7 processing the NOx in the exhaust gas in the upstream, and a device 8 adding a reducing agent in the upstream of the reduction catalyst 7.