Relationship between TCE nonthermal decomposition and OH radical behavior observed by LIF

In order to solve air pollution problem, atmospheric plasma application is desirable. In this study, we realized the real-time OH density measurement in trichloroethylene (TCE) decomposition by coaxial cylinder pulsed barrier discharge. Laser-induced fluorescence measurement indicated that OH density is about 30 ppm at 3 μs after discharge when +28 kV is applied. As for the negative discharge, OH measurement revealed that OH production is almost the same but OH density is about a half compared to those in positive discharge, due to the difference in streamer radius. The TeE addition in background accelerated OH decay, and by chemical reaction simulation, OH-TeE reaction coefficient was estimated to be about 2.3 × 10^-12 [cm³/s]. Humidity effect on TeE decomposition efficiency in N₂ pulsed barrier discharge is also investigated using the same reactor. The increasing humidity resulted in enhancement of TeE decomposition efficiency, indicating that OH plays important role in TeE decomposition.