Regeneration mechanism of Pd/AC catalyst in dielectric barrier discharge plasma

Regeneration of deactivated Pd/AC catalyst was carried out in a dielectric barrier discharge(DBD)plasma reactor and activities of regenerated catalysts were assessed by catalytic ozonation reactions. The surface morphology, surface area and organic compounds were characterized by SEM, BET and TG respectively. In order to investigate regeneration mechanism of Pd/AC catalyst, concentration of O3 and plasma emission spectra during DBD process were detected. The results showed that regeneration efficiency could be by 95% after 30 min treatment. Nitrobenzene degradation efficiency was 87% using ozonation reaction catalyzed by Pd/AC catalyst regenerated under the optimized condition. The regeneration efficiency with ozone solely was only 25.6%, indicating that radicals with strong oxidation ability produced in DBD process was main factor for Pd/AC catalyst regeneration. © All Rights Reserved.