Degradation of Benzene by Using a Silent-Packed Bed Hybrid Discharge Plasma Reactor  

作　　者：姜楠 鲁娜 李杰 吴彦 

机构地区：[1]Key Laboratory of Industrial Ecology and Environmental Engineering(MOE),School of Environmental Science and Technology,Dalian University of Technology [2]Institute of Electrostatics and Special Power,Dalian University of Technology

出　　处：《Plasma Science and Technology》2012年第2期140-146,共7页等离子体科学和技术（英文版）

基　　金：supported by the Program for National Natural Science Foundation of China (No.51177007);Liaoning Excellent Talents in University of China (Project No.2009R09);863 Program of China (No.2009AA064101-4)

摘　　要：In this work, a novel gas phase silent-packed bed hybrid discharge plasma reactor has been proposed, and its ability to control a simulative gas stream containing 240 ppm benzene is experimentally investigated. In order to optimize the geometry of the reactor, the benzene conversion rate and energy yield （EY） were compared for various inner electrode diameters and quartz tube shapes and sizes. In addition, benzene removal efficiency in different discharge regions was qualitatively analyzed and the gas parameter （space velocity） was systematically studied. It has been found that silent-packed bed hybrid discharge plasma reactor can effectively decompose benzene. Benzene removal proved to achieve an optimum value of 60% with a characteristic energy density of 255 J/L in this paper with a 6 mm bolt high-voltage electrode and a 13 mm quartz tube. The optimal space velocity was 188.1 h^-1, which resulted in moderate energy yield and removal efficiency. Reaction by-products such as hydroquinone, heptanoic acid, 4-nitrocatechol, phenol and 4-phenoxy-phenol were identified by mean of GC-MS. In addition, based on these organic by-products, a benzene destruction pathway was proposed.In this work, a novel gas phase silent-packed bed hybrid discharge plasma reactor has been proposed, and its ability to control a simulative gas stream containing 240 ppm benzene is experimentally investigated. In order to optimize the geometry of the reactor, the benzene conversion rate and energy yield （EY） were compared for various inner electrode diameters and quartz tube shapes and sizes. In addition, benzene removal efficiency in different discharge regions was qualitatively analyzed and the gas parameter （space velocity） was systematically studied. It has been found that silent-packed bed hybrid discharge plasma reactor can effectively decompose benzene. Benzene removal proved to achieve an optimum value of 60% with a characteristic energy density of 255 J/L in this paper with a 6 mm bolt high-voltage electrode and a 13 mm quartz tube. The optimal space velocity was 188.1 h^-1, which resulted in moderate energy yield and removal efficiency. Reaction by-products such as hydroquinone, heptanoic acid, 4-nitrocatechol, phenol and 4-phenoxy-phenol were identified by mean of GC-MS. In addition, based on these organic by-products, a benzene destruction pathway was proposed.

关 键 词：silent-packed bed hybrid discharge BENZENE DEGRADATION MECHANISMS 

分 类 号：X511[环境科学与工程—环境工程] O643.32[理学—物理化学]