Simultaneous removal of NO and SO2 in a plasma reactor packed with TiO2-coated glass beads

Abstract

We analyzed the dielectric pellet bed discharge-photocatalyst hybrid process for NO and SO2 removal. A cylindrical-wire type discharge reactor was packed with glass beads as dielectric pellets and the plasmas were generated by dielectric pellet bed discharge. The TiO2 photocatalysts were coated onto the glass beads by the dip-coating method and were activated by the light from discharge. Experiments were carried out for three cases: NO removal only, SO2 removal only, and simultaneous NO and SO2 removal. As the voltage applied to the plasma reactor increased, or as the residence time increased, the NO and SO2 removal efficiencies increased. With increasing initial NO and SO2 concentrations, the NO and SO2 removal efficiencies decrease. The removal efficiencies for simultaneous NO and SO2 removal are lower than those for NO only or SO2 only.