当前位置: X-MOL 学术J. Saudi Chem. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Product analysis and mechanism of toluene degradation by low temperature plasma with single dielectric barrier discharge
Journal of Saudi Chemical Society ( IF 5.6 ) Pub Date : 2020-07-12 , DOI: 10.1016/j.jscs.2020.07.004
Han Fenglei , Li Mengyu , Zhong Huangrong , Li Ting , Li Dandan , Zhou Shuo , Guo Wenwen , Liu Fang

A single dielectric barrier discharge (DBD) low-temperature plasma reactor was set up, and toluene was selected as the representative substance for volatile organic compounds (VOCs), to study the reaction products and degradation mechanism of VOCs degradation by low-temperature plasma. Different parameters effect on the concentration of O3 and NOx during the degradation of toluene were studied. The exhaust in the process of toluene degradation was continuously detected and analyzed, and the degradation mechanism of toluene was explored. The results showed that the concentration of O3 increased with the increase of the power density and discharge voltage of the plasma device. However, as the initial concentration of toluene increased, the concentration of O3 basically keep steady. The concentration of NOx in the by-products increased with the discharge voltage, power density, and initial concentration of toluene in the plasma device, and the concentration of NO2 was much higher than the concentration of NO. The degradation process of toluene was detected and analyzed. The results showed that the degradation mechanism of toluene by plasma includes high energy electron bombardment reaction, active radical reaction and ion molecule reaction. Among them, the effect of high-energy electrons on toluene degradation is the largest, followed by the effect of free radicals, in which oxygen radicals participated in the reaction mainly through the formation of C–O bond, Cdouble bondO bond, (CO)–O– bond and –OH radical, while nitrogen radicals participate in the reaction mainly through the formation of C–NH2, (Cdouble bondNH)- bond, Ctriple bondN bond and C–NO2 bond. The results can provide some data supports for the study of low-temperature plasma degradation of VOCs.



中文翻译:

单介质势垒放电低温等离子体降解甲苯的产物分析及机理

建立了单介质阻挡放电(DBD)低温等离子体反应器,选择甲苯作为挥发性有机化合物(VOCs)的代表物质,研究了低温等离子体降解VOCs的反应产物和降解机理。研究了甲苯降解过程中不同参数对O 3和NO x浓度的影响。对甲苯降解过程中的尾气进行了连续检测和分析,并探讨了甲苯的降解机理。结果表明,O 3的浓度随着等离子体装置功率密度和放电电压的增加而增加。但是,随着甲苯初始浓度的增加,O的浓度3基本保持稳定。副产物中NO x的浓度随等离子体装置中的放电电压,功率密度和甲苯的初始浓度而增加,并且NO 2的浓度远高于NO的浓度。检测并分析了甲苯的降解过程。结果表明,等离子体对甲苯的降解机理包括高能电子轰击反应,活性自由基反应和离子分子反应。其中,高能电子对甲苯降解的影响最大,其次是自由基的作用,其中氧自由基主要通过形成C–O键,C参与反应。双键O键,(CO)–O–键和–OH自由基,而氮自由基主要通过形成C–NH 2,(C 双键NH)–键,C 三键N键和C–NO 2键参与反应。研究结果可为VOCs的低温等离子体降解研究提供一些数据支持。

更新日期:2020-07-12
down
wechat
bug