EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of satisfactorily restraining NOxfrom being produced from ammonia in a reversible fashion as well as sufficiently reducing an amount of discharged ammonia to the atmosphere, produced in an NOxocclusion reduction catalyst device by the passage of an exhaust gas with a rich air-fuel ratio.

SOLUTION: The exhaust emission control device is equipped with the NOxocclusion reduction catalyst device 2 arranged in an engine exhaust system and a downstream-side catalytic device 3 arranged on a downstream side of the NOxocclusion reduction catalyst device to carry an iron-based catalyst.

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