Abstract:
The flow field effect on the decomposition of a volatile organic compound induced by plasma or plasma-catalytic system is
investigated by using a new developed ejection wire-cylinder reactor generating pulsed corona plasma. Toluene is chosen as the
test contamination and nano-TiO2 film is chosen as the photocatalyst. The flow field affects the toluene decomposition induced by
either single plasma or combination of plasma with catalyst, and it also affects the development of purification capability. Without
catalyst, the difference of decomposition efficiency resulting from different flow field is 14.4% at voltage of 34kV, while with
catalyst, it approaches to 15.6% at voltage of 30kV. The time to reach maximum purification capability under ejection condition is
longer than that under circumfluence condition, but the purification capability under ejection condition is stronger. The synergy of
plasma and catalyst on toluene decomposition is obviously, and the decomposition efficiency is as high as 94.74% when the inlet
toluene concentration increases to 400 ppm. With catalyst, the decomposition efficiencies with positive pulse and with larger
electrical capacitance are obviously higher than that with negative pulse and with smaller electrical capacitance, respectively. And
the differences all increase with the increase of voltage.

Zhihui Xie, Lingen Chen∗, Fengrui Sun, Qizheng Ye