Particle Formation and Growth in Dielectric Barrier Discharge - Photocatalysts Hybrid Process for SO2 Removal

SO2 제거를 위한 유전체 장벽 방전 - 광촉매 복합 공정에서의 입자 형성과 성장

We analyzed the effects of several process variables on the SO2 removal and particle growth by the dielectric barrier discharge-photocatalysts hybrid process. In this process, SO2 was converted into the ammonium sulfate ((NH4)2SO4) particles. The size and crystallinity of ammonium sulfate particles were examined by using TEM and XRD analysis. The dielectric barrier discharge reactor consisted of two zones: the first is for plasma generation and the second is for ammonium sulfate particles formation and growth. The first zone of reactor was filled with glass beads as adielectric material. To enhance SO2 removal process, the TiO2 photocatalysts were coated on glass beads by dip-coating method. As the voltage applied to the plasma reactor or the pulse frequency of applied voltage increases, the SO2 removalefficiency increases. Also as the initial concentration of SO2 decreases or as the residence time increases, the SO2 removal efficiency increases. (NH4)2SO4 particles continue to grow by particle coagulation and surface reaction, moving inside the reactor. Larger particles in site are produced according to the increase of residence time or SO2 concentrations.