摘要
苯排放到大气中会影响空气质量和人体健康,其排放需要得到控制。为此,利用装有微量贵金属(Au、Ag和Pt,负载量(质量分数)0.1×10–6~10×10–6)催化剂的介质阻挡放电(DBD)反应器分解模拟空气中的苯,研究了苯在不同贵金属负载量、不同反应温度和不同能量密度条件下的分解特性,并对苯的分解机理做了探讨。实验结果表明:1)和无催化剂的DBD反应器相比,载有贵金属催化剂的DBD反应器能显著增加苯的去除率。2)在反应温度为25℃和能量密度为400 J/L的条件下,各催化剂对苯的最大去除率按从高到低排序为:Au(93.8%)>Pt(81.1%)>Ag(81.0%)>无催化剂(55%)。3)苯分解的气相产物为CO和CO2,在催化剂负载量和反应温度一定的条件下,苯的去除率随能量密度的增加而增加。4)在催化剂负载量、能量密度一定的条件下,苯的去除率随反应温度的增加而增加。
Asbenzene emitted into the atmosphere impairs the atmosphere quality and health of human being ,thus its emission must be controlled. We used micro level noble catalysts （Au,Ag and Pt, weight loadings 0.1 ×10^-6-10×10^-6） installed in a dielectric barrier discharge （DBD） reactor to decompose benzene in stimulated air.Moreover, we characterized the benzene composition under different noble catalyst loadings, various reaction temperatures, and various energy densities ,and discussed the mechanism of benzene decomposition. Experimental results show that： 1） Benzene removal rates in the DBD reactors with noble metal catalysts will significantly increase compared with the DBD reactor in the absence of a catalyst. 2） At a fixed reaction temperature of 25 ℃ and energy density of 400 J/L, the maximum removal rates of benzene with different catalysts have the order of Au （93.8%）〉Pt（81.1%）〉Ag（81%）〉 non-catalyst （55%）. 3） When using the same catalyst loadings and at the same reaction temperature, the benzene removal rates will increase with the increase in the energy density. 4） When using the same catalyst loadings and certain energy density, benzene removal rates will in- crease with the increase in reaction temperature.
作者
姚水良
毛灵爱
张霞
唐秀娟
YAO Shuiliang;MAO Ling＇ai;ZHANG Xia;TANG Xiujuan(School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第12期3973-3980,共8页
High Voltage Engineering
基金
国家自然科学基金(11575159)
浙江省重点科技创新团队建设项目(2013TD07)
浙江省公益性技术应用研究计划(2015C31018)~~
