Removal of NOx by DC corona reactor with water

Corona plasma over water surface is effective for NOx treatment, i.e., oxidization of NO and dissolving of NO2 into water. We proposed a new type of reactor with DC corona discharge over water surface, and carried out NOx treatment tests under various concentrations with diesel exhaust gas and blended NO test gas. Removal of 90% of NOx could be achieved in the reactor with and without water for diesel exhaust gas. It showed more than 95% of NOx removal rate with water but very low removal rate without water in the treatment test for dry NO gas. Ions and conductivity in the water of the reactor after NOx removal test were measured and discussed on the effective radicals and reactions for NOx treatment processes of this reactor. It has been confirmed that the presence of water with DC corona discharge provides excellent conditions for NOx removal processes.