介质阻挡放电-催化降解空气中甲苯的研究  

Study on toluene destruction in air stream by dielectric barrier discharge combined with catalytic system

作　　者：关绣娟[1] 叶代启[1] 黄海保[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006

出　　处：《环境工程学报》2008年第7期977-982,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20577011)

摘　　要：着重考察了催化剂分解O3对介质阻挡放电-催化降解甲苯效果的影响,对比不同催化剂在3种催化剂结合方式下对O3分解能力及甲苯降解效果。同时研究了影响O3产生及分解的条件——放电电压、水汽和氧含量对甲苯降解的影响。结果表明,催化剂的O3分解能力越强,对甲苯的降解效果越好,O3的催化分解在甲苯降解过程中起重要作用。当放电电压为10 kV时,在余辉区和等离子体区加入催化剂,甲苯的去除率分别由无催化剂时候的33.8%提高到55.6%～66.2%和65.2%～74.2%。气流中的水汽对O3的产生和分解都产生不利影响,可降低甲苯的去除率。氧气含量高时,一方面增加O3的产生,另一方面降低催化剂对O3的分解,在O2含量为5%时,甲苯去除效果较佳。To study the performance of O3 decomposition by catalyst on the toluene destruction in dielectric barrier discharge（DBD） catalytic system, the toluene conversion and O3 decomposition by beterogeneous catalyst in three different combinations were researched. Meanwhile the effects of applied voltage, water and oxygen on toluene destruction were studied, which originally have effects on the production and decomposition of O3. Resuits show that catalysts decomposing O3 more effectively lead to better toluene destruction. It is comcluded that O3 decomposition plays an important part in the toluene destruction. When applied voltage is 10 kV, toluene conversion increases to 55.6% - 66.2% with catalyst placed downstream, and to 65.2% -74.2% with catalyst placed in situ. Water vapor inhibits the production and decomposition of ozone, resulting in lower toluene conversion. The preferably contention of oxygen is determined to be 5% for its contribution in O3 production and decomposition.

关 键 词：介质阻挡放电 等离子体 催化 臭氧 

分 类 号：X701[环境科学与工程—环境工程]