介质阻挡放电低温等离子体协同催化降解苯乙烯  

Degradation of styrene by dielectric barrier discharge low-temperature plasma synergistic catalysis technology

作　　者：胡志军 王志良 HU Zhijun;WANG Zhiliang(Jiangsu Qiqing Environmental Science and Technology Co.,Ltd.,Nanjing 210046,China)

机构地区：[1]江苏齐清环境科技有限公司,江苏南京210046

出　　处：《化工环保》2023年第5期627-632,共6页Environmental Protection of Chemical Industry

基　　金：江苏省科技支撑计划-社会发展项目(BE2011808);江苏省环保科研课题项目(201110)。

摘　　要：采用介质阻挡放电(DBD)低温等离子体协同催化降解苯乙烯,考察了输入功率、初始苯乙烯质量浓度、气体湿度、停留时间、脉冲频率等因素对苯乙烯降解率和能量效率的影响,建立了苯乙烯降解动力学模型,探讨了苯乙烯的降解机理。结果表明:在输入功率30 W、初始苯乙烯质量浓度464 mg/m^(3)、气体相对湿度30%、停留时间0.18 s、脉冲频率200 Hz的最佳工艺条件下,苯乙烯降解率为62.20%,能量效率为36.10 g/(kW·h);DBD等离子体降解苯乙烯的动力学过程符合准一级动力学模型,相应的反应速率常数为0.1094 m^(3)/(W·h)。DBD等离子体降解苯乙烯主要通过活性物种e^(-)、·O、·OH和NO_(2)·等对苯乙烯进行氧化。与单独DBD等离子体工艺相比,在相同输入功率下,DBD协同催化工艺能有效提高苯乙烯降解率和矿化率,降低反应器出口O3浓度。Styrene was degraded by the process of dielectric barrier discharge(DBD)plasma synergistic catalysis.The factors affecting styrene degradation rate and energy efficiency were investigated,such as input power,initial mass concentration of styrene,gas humidity,residence time and pulse frequency.A kinetic model for styrene degradation was established and the degradation mechanism of styrene was explored.The results show that the optimal process parameters for styrene degradation by DBD plasma synergistic catalysis are as follows:input power 20-40 W,gas humidity 30%-45%,residence time 0.18-0.44 s,and pulse frequency 200 Hz.Under these conditions,the degradation rate of styrene is 62.20%,and the energy efficiency is 36.10 g/(kW·h).The kinetic process of styrene degradation by DBD plasma conforms to the quasi first order reaction kinetic model,and the corresponding reaction rate constant is 0.1094 m^(3)/(W·h).The degradation of styrene by DBD plasma mainly involves the oxidation of styrene by active species such as e^(-),·O,·OH,and NO_(2)·.Compared with the single DBD plasma process at the same input power,the DBD Synergistic catalysis process can effectively improve the degradation rate and mineralization rate of styrene,and reduce the O3 concentration at the reactor outlet.

关 键 词：介质阻挡放电等离子体 降解 矿化 能量效率 苯乙烯 协同催化 

分 类 号：X51[环境科学与工程—环境工程]