Comparison of the Plasma-Photocatalyst Synergy at Low and Atmospheric Pressure

Abstract- The decay rate of C2H2 in a plasma-photocatalyst coupling device is analyzed at atmospheric pressure and in a pulsed low pressure DC discharge. In the latter case, mid infrared laser absorption spectrocopy of the gas phase makes possible the dynamic measurement of the C2H2 density in a single plasma shot with a time resolution of 1 ms. Plasma-TiO2 combination for VOC is shown and an addition synergistic effect is evidenced when external ultraviolet radiation are added. At atmospheric pressure, gas phase and adsorbed phase analyses have been performed in order to evaluate the oxidation processes performances regarding to the polutant removal and the selectivity into CO and CO2