Treatment of NOx in exhaust gas by corona plasma over water surface

For developing NOx treatment engineering of exhaust gas in lower construction and operating cost, we propose a new type of corona reactor with some experimental results. The reactor is madeup of multi needles' electrode placed over water and to make use of corona plasma over water surface for plasma chemical reactions. Typical corona characteristics of the reactor with positive and negative DC high voltage are alike to discharge of normal air gap, and not so much changed by different water conductivity and electrode arrangements. The result of NOx treatment test using the exhaust gas of diesel engine shows 100% of NO removal and 95% removal rate of NOx under suitable conditions. (C) 2000 Elsevier Science Ltd. All rights reserved.