TREATMENT OF EXHAUST GAS FROM DIESEL ENGINE

PURPOSE:To simultaneously treat gaseous hydrocarbon and particulate hydrocarbon, and also denitrate NOx without being obstructed by spraying ammonia, aqueous ammonia or a ammonium bicarbonate aqueous solution to exhaust gas in a high temp. state to pass said gas through a reactive decomposition bed having an oxidizing catalyst and a denitrating catalyst simultaneously supported thereon. CONSTITUTION:Ammonia, aqueous ammonia or an ammonium bicarbonate aqueous solution is sprayed to exhaust gas in a high temp. state from an injection port to pass the exhaust gas through a reactive decomposition bed 4 having an oxidizing catalyst and a denitrating catalyst simultaneously supported thereon (1), or the exhaust gag is passed through the oxidizing catalyst bed in a high temp. state at first and ammonia, aqueous ammonia or the ammonium bicarbonate aqueous solution is subsequently sprayed to the exhaust gas to pass said gas through the denitrating catalyst bed (2). As a result, not only gaseous hydrocarbon but also particulate hydrocarbon exerting poisoning action on the denitrating catalyst in the exhaust gas are decomposed and, therefore, NOx is also denitrated without being obstructed to enable simultaneous treatment.