等离子体引发CeO_2低温催化活性协同脱除空气中苯  

Synergistic removal of benzene from air by plasma triggering CeO_2 catalyst's low-temperature activity

作　　者：丁慧贤[1] 赵宇杰[2] 张增凤[1] 

机构地区：[1]黑龙江科技大学环境与化工学院,哈尔滨150022 [2]大庆油田有限责任公司第六采油厂试验大队,黑龙江大庆163000

出　　处：《黑龙江科技学院学报》2014年第2期132-135,140,共5页Journal of Heilongjiang Institute of Science and Technology

基　　金：黑龙江省自然科学基金项目(A201203)

摘　　要：苯是一种典型的室内空气污染物,可引起一系列健康问题。采用介质阻挡放电等离子体与二氧化鈰催化剂相结合的方法,在大气压及35℃下,进行脱除空气中苯研究。考察了放电电压、苯的初始浓度以及水量等因素对苯脱除率的影响,分析了等离子体与催化剂的协同效应。当气体中C6H6的体积分数为102×10-6、H2O的体积分数为1.2%、空气为平衡气、输入的放电电压为18 kV、空速为13 650 h-1时,苯的脱除率可达98.7%。而在同样实验条件下,单纯等离子体脱除苯和单纯催化氧化脱除苯的脱除率分别为69.5%和10.0%。实验结果表明,等离子体与CeO2催化剂催化氧化空气中苯的过程中产生了显著的协同效应,等离子体产生的活性自由基,如O和HO2等,是实现CeO2催化氧化苯的氧化-还原转化循环过程的关键。This paper is motivated by the realization that benzene is a typical indoor air pollutant contributing to a range of health problems. The paper discusses the efforts to study the removal of benzene in air by combining the dielectric barrier discharge plasma with CeO2catalyst at atmospheric pressure and 35 ℃,investigate the effect of discharge voltage,initial concentration of benzene and water content on benzene removal rate,and analyze the synergistic effect between plasma and catalyst. A feed gas mixture of 102 × 10^- 6C6H6,1. 2% H2O in air,GHSV of 13 650 h^- 1,and input discharge voltage of 18 kV lead to the benzene removal rate of 98. 7%. But the same experimental conditions yield the benzene removal rate of 69. 5% and 10. 0% respectively for pure plasma-induced oxidation and for pure catalytic oxidation over CeO2（ without discharges）. The results suggest that the plasma and CeO2catalyst produce a significant synergistic effect in C6H6oxidation,and the plasma-generated active radicals,such as O and HO2, hold the key to enabling the catalytic redox circles of CeO2to oxidize C6H6.

关 键 词：苯 等离子体 催化 CEO2 

分 类 号：X511[环境科学与工程—环境工程]