NOX DEGRADATION ENHANCEMENT IN A DIELECTRIC BARRIER DISCHARGE CELL WITH A SERRATED ELECTRODE

Abstract

In this study, the electrode surface of NOx removal treatment reactor was modified in order to lower the operation voltage, to reduce its electric potential level and, at the same time, to increase its removal capacity by generating a cold plasma using a non-homogenous electric field on the electrode surface. This electric fields was achieved by means of a serrated electrode profile (Reactor 1). Concentrations of 30-60 ppm of NOx in nitrogen was used with 1 L/min flow. The exhaust gases were analyzed as well as characterised by gas chromatography and mass spectrometry. Additional experiments were also carried out in a reactor of the same reaction volume but where two conventional flat electrodes (Reactor 2), in order to compare the results. The NOx removal efficiency as in the two flat electrodes as in the serrated DBD cell were close to 98% with the lower power in this last one both experimentals removal of NOx were carried out in a 22,4 cm3 volumen reactor.