EXHAUST GAS PURIFICATION APPARATUS FOR DIESEL ENGINE
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United States of America Patent
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app pub date -
Mar 7, 2011
filing date -
Sep 9, 2008
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Abstract
A DPF disposed in an exhaust passage of a diesel engine is coated with a selective reducing catalyst, for selectively reducing and purifying NOx by using a reducing agent, and a thin film, having fine pores of size for allowing passage of the NOx and preventing passage of PM, in this order. In regeneration treatment of a DPF, the thin film prevents direct transmission of combustion heat of the PM to the selective reducing catalyst and suppresses a temperature rise of the selective reducing catalyst to thereby suppress deterioration of an active component.
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