摘要：Non-thermal plasma technique (NTP) has a good efficiency in degradation of chlorinated volatile organic compounds. One of the reactors applied in NTP technology is dielectric barrier discharge (DBD). In this reactor, due to the dielectric barrier, the distance between the electrodes is low and led to increasing space velocity of the pollutant in the discharge zone. In this study, a dielectric barrier discharge (DBD) reactor with expanded graphite as the discharge electrode was used for gaseous chlorobenzene degradation. It was found that discharge occurred in the larger gap, and degradation efficiency was promoted by increasing voltage, initial concentration, and decreasing flow-rate. The selectivity of CO2 was improved by increasing the applied voltage but decreasing the initial flow-rate and vapour concentration. Furthermore, it was observed that the amount of the produced ozone was nearly constant and not affected by parameters such as applied voltage, flow-rate, and the concentration of pollutants. Increasing chlorobenzene degradation is due to the decrease in space velocity of the pollutant in the discharge gap region. Moreover, flow-rate increased when being affected lightly by the degradation owing to adsorption property of the expanded graphite as well as an increase in the discharge gap region. The rate of ozone production as a byproduct was approximately constant and did not change by increasing voltage, which is because of ozone degradation by increasing voltage through additional high-energy electrons and the catalytic role of the graphite.
