Catalytic oxidation of gas-phase elemental mercury by nano-Fe_2 O_3

查看全文 作　　者：Fanhai [1]Kong;Jianrong [1]Qiu;Hao [1]Liu;Ran [1]Zhao;Zhihui [2]Ai

机构地区：[1]State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.;[2]Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China

出　　处：《Journal of Environmental Sciences》索引2011年第23卷第4期,共6页

基　　金：supported by the Scientific Funds for Outstanding Young Scientists of China(No.50525619);the National Natural Science Foundation of China(No.51078163,50706014);the National High Technology Research and Development Program(863)of China(No.2006AA05Z304) 摘　　要：Heterogeneous oxidation of gas-phase Hg 0 by nano-Fe 2 O 3 was investigated on a fixed bed reactor, and the effects of oxygen concentration, bed temperature, water vapour concentration and particle size have been discussed. The results showed that Hg 0 could be oxidized by active oxygen atom on the surface of nano-Fe 2 O 3 as well as lattice oxygen in nano-Fe 2 O 3 . Among the factors that affect Hg 0 oxidation by nano-Fe 2 O 3 , bed temperature plays an important role. More than 40% of total mercury was oxidized at 300°C, however, the test temperature at 400°C could cause sintering of nano-catalyst, which led to a lower efficiency of Hg 0 oxidation. The increase of oxygen concentration could promote mercury oxidation and led to higher Hg 0 oxidation efficiency. No obvious mercury oxidation was detected in the pure N 2 atmosphere, which indicates that oxygen is required in the gas stream for mercury oxidation. The presence of water vapour showed different effects on mercury oxidation depending on its concentration. The lower content of water vapour could promote mercury oxidation, while the higher content of water vapour inhibits mercury oxidation. 关键词：催化氧化汞元素纳米铁气相水蒸汽含量固定床反应器床层温度氧化效率

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Catalytic oxidation of gas-phase elemental mercury by nano-Fe_2 O_3

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