Time-resolved characterization of non-thermal plasma-assisted photocatalytic removal of nitric oxide

Ming YANG, Kun LIU, Liuhao MA, Kin-Pang CHEONG, Zhen WANG, Wing Kei HO, Wei REN

Research output: Contribution to journalArticles

Abstract

We performed time-resolved characterization of plasma-photocatalytic removal of nitric oxide (NO) in a ceramic foam packing double dielectric barrier discharge reactor using mid-infrared laser absorption spectroscopy. Non-thermal plasma (NTP) was generated in the porous ceramic foam coated with mesoporous TiO₂ thin film. Real-time NO monitoring was performed using a quantum cascade laser at 5.26 µm combined with a custom-designed multipass gas cell, leading to a sub-ppm detection limit at 0.1 s measurement time. By analyzing the feed gas of 90 ppm NO/1% O₂ balanced in N₂, the plasma treatment without TiO₂ photocatalyst had no effect on NO removal when the discharge power was below 45 W. In comparison, the NTP-TiO₂ system achieved an efficiency of 49% for NO removal even at the relatively low discharge power of 18 W. The synergy between NTP and TiO₂ photocatalyst effectively promotes the NO removal at low plasma discharge powers. However, we also observed a negative effect of TiO₂ photocatalyst on NO removal at a relatively high discharge power of 135 W. Copyright © 2019 IOP Publishing Ltd.
Original languageEnglish
Article number01LT02
JournalJournal Physics D: Applied Physics
Volume53
Issue number1
Early online dateOct 2019
DOIs
Publication statusPublished - Jan 2020

Citation

Yang, M., Liu, K., Ma, L., Cheong, K.-P., Wang, Z., Ho, W., & Ren, W. (2019). Time-resolved characterization of non-thermal plasma-assisted photocatalytic removal of nitric oxide. Journal of Physics D: Applied Physics, 53(1). Retrieved from https://doi.org/10.1088/1361-6463/ab474b

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