HC-supported NO-oxidation in Marine Diesel Exhaust Gases for Subsequent Catalytic Treatment

M. Schmidt, R. Basner, and R. Brandenburg

Leibniz-Institute for Plasma Science and Technology, Germany

Abstract— The application of dielectric barrier discharge (DBD) treatment to oxidise nitrogen monoxide (NO) to nitrogen dioxide (NO2) in marine diesel engine exhaust has been investigated in laboratory scale experiments. Special attention was paid on a scalable reactor concept and a design realising a small pressure drop of 300 Pa under all test conditions. Different laboratory gas mixtures were used to model engine operation conditions of 10%, 50% and 100% load, respectively. The gas temperature was varied between 160ツーC and 400ツーC. The specific energy density (SED) of the DBD reactor was varied between ~10 J/L and ~130 J/L with a total gas flow of 200 L/h. Furthermore, the influence of the admixture of propene (C3H6) on the NO oxidation was investigated. The maximum NO removal increased from 20% without C3H6 admixture to 50-55% with 165 mL/h C3H6 added at 160ツーC. Under this conditions, the SED required to achieve NO removal >50% increased from 15 J/L at 10% load to 40 J/L at 100% load. At temperatures over 300ツーC significant decrease in NO removal and rapid consumption of C3H6 was found.

Keywords— Non-thermal plasma, NO, NO2, oxidation, hydrocarbon, marine, diesel, exhaust



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