Application of dielectric barrier discharge in the removal of NO<inf>x</inf> from diesel exhaust

Abstract

Application of Non-thermal plasma for gas cleaning is gaining prominence in recent years, which can effectively remove NOx and other exhaust gases simultaneously. As the present researches are mostly adopting simulation gas for the investigation, this paper employed the NOx from the actual diesel exhaust as the investigated subject. Effects of the amplitude and frequency of voltage, the diameter of high-voltage electrode, the reactor volume and the discharge gap on NOx removal were studied based on dielectric barrier discharge. Obtained results indicate that, the removal rate of NOx increased first and then decreased with increasing the magnitude and frequency of the voltage. With decreasing discharge gap, the removal rate of NOx increased. With increasing the volume of reactor and the diameter of high-voltage electrode, the removal rate of NOx increased.

Augmenting NO x reduction in diesel exhaust by combined plasma/ozone injection technique: a laboratory investigation

“…It should be noted here that the exhaust which is entering into the plasma zone is laden with unreacted ozone from the previous mixing chamber (indirect plasma) and there will be the production of ozone inside the plasma chamber too (direct plasma). Together there will be a copious amount of ozone available in the plasma chamber which reacts with NO to form NO 3 (21) and NO 3 , in turn, may react with HNO 2 forming HNO 3 (30). As seen from Fig.…”