The control of NOx (NO and NO2) emissions from marine engines remains a challenge. In recent years, there have been a number of reports show that plasma device combined with a catalyst can reduce as high as 90% of NOx in simulated diesel exhaust gas. In the case of real diesel exhaust, the beneficial role of a plasma treatment is now thought to be the oxidation of NO to NO2, and the formation of partially oxidized hydrocarbons that are more active for the catalytic reduction of NO2. This paper briefly describes research efforts aimed non-thermal plasma reactor development for ships use, and primary focused on NO oxidation conditions, functionally fitted to the engine mode of operation.
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