EM3-2: Development of Diesel Soot Aftertreatment System using Barrier Discharge Plasma and Oxidation Catalyst(EM: Exhaust Emission Control and Measurement,General Session Papers)

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This study is concerned with an aftertreatment system of diesel soot. The system first causes a non-thermal barrier discharge plasma reaction. Exhaust NO is converted into NO_2 by O_3 and activated oxygen radicals in the atmosphere of the plasma reaction. The produced NO_2 gas is then introduced into soot filter and is used to improve soot oxidation. NO_2 gas has an effect to start soot oxidation at low temperature. Moreover, this study employs a cheap oxidation catalyst made from iron oxides to promote soot oxidation. This paper tries to improve NO conversion into NO_2 and soot oxidation so as to apply the system to an engine. Results show that exhaust gas flow caused by configuration of plasma reactor has a great effect on improving conversion efficiency of NO into NO_2. High turbulence flow activates chemical reaction between NO and plasma gases. Honeycomb filter with wall-flow structure is used for soot oxidation. The iron oxide catalyst is blended about 30% in weight in the structural materials of the honeycomb before manufacturing the filter. The filter with the oxidation catalyst has a great effect on soot oxidation free from CO production with keeping low temperature oxidation of soot.

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