| Title: | Toluene degradation in air/H(2)O DBD plasma: A reaction mechanism investigation based on detailed kinetic modeling and emission spectrum analysis |
| Author(s): | Yue W; Lei W; Dong Y; Shi C; Lu Q; Cui X; Wang X; Chen Y; Zhang J; |
| Address: | "School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, PR China; Jiangsu Smart Energy Technology and Equipment Engineering Research Center, Xuzhou 221116, PR China. School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, PR China; Jiangsu Smart Energy Technology and Equipment Engineering Research Center, Xuzhou 221116, PR China. Electronic address: yuminchen@cumt.edu.cn. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, PR China" |
| DOI: | 10.1016/j.jhazmat.2023.130894 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Non-thermal plasma (NTP) is emerging as an attractive method for decomposing volatile organic compounds (VOCs). In this paper, to study toluene degradation mechanism in air/H(2)O dielectric barrier discharge (DBD) plasma, optical emission spectrometry (OES) was employed to in-situ monitor active species in plasma, with the permanent degradation products being detected by on-line mass spectrometry under various operations. A detailed kinetic model of NTP with incorporation of non-constant electron filed and thermal effects has also been established. A toluene degradation efficiency > 82% could be achieved at P = 115 W, C(in, toluene) = 1000 ppm. The relative spectrum intensity of excited OH, O, H and N(2) (A(3)Sigma(+)(u)) increased with increase of discharge power and was decreased at higher gas flowrates. Toluene degradation was mainly induced by oxidation of OH and O at afterglow stage, while part of toluene was decomposed by attack of electrons and reactive particles N(2) (A(3)Sigma(+)(u)) in discharge stage. A toluene degradation pathway has been proposed as: toluene-->benzyl-->benzaldehyde-->benzene-->phenoxy-->cyclopentadiene-->polycarbenes/alkynol-->CO(2)/H(2)O. Benzoquinone, benzaldehyde, cyclopentadiene and cyclopentadienyl are supposed to be important intermediates for the ring-opening of toluene. Clarification of toluene degradation behaviors at discharge and afterglowing stage could provide new insights for plasma-catalytic process in future" |
| Keywords: | "Emission spectroscopy Mechanism investigation, Kinetic modeling Non-thermal plasma Toluene degradation;" |
| Notes: | "PubMed-not-MEDLINEYue, Wenjing Lei, Wentao Dong, Yongheng Shi, Chengjing Lu, Qiancheng Cui, Xin Wang, Xinyu Chen, Yumin Zhang, Junying eng Netherlands 2023/02/06 J Hazard Mater. 2023 Apr 15; 448:130894. doi: 10.1016/j.jhazmat.2023.130894. Epub 2023 Feb 2" |
