Synergistic effect in one-stage dielectric barrier discharge plasma and Ag/Al2O3 catalytic systems on C2H2-SCR of NOx

C2H2-SCR of NOx over one-stage dielectric barrier discharge (DBD) plasma system combined with Ag modified alumina catalyst at excess oxygen was carried out. NOx and C2H2 conversions and COx selectivity dependence on reaction temperature and discharge voltage were investigated systematically. At low temperatures, a synergistic effect of HC-SCR of NOx in one-stage DBD plasma and 2 wt% Ag/Al2O3 catalyst was clearly observed. The improvement on the NO + O-2 co-adsorption and formation of more active nitrate species adsorbed on 2 wt% Ag/Al2O3 catalyst by plasma was analyzed by MS-TPD and TPSR methods.