Catalytic oxidation and capture of elemental mercury from simulated flue gas using Mn-doped titanium dioxide

被引:0
|
作者
Jingtao Zhi
Xianqun Yu
Jingjing Bao
Xiaoxiang Jiang
Hongmin Yang
机构
[1] Nanjing Normal University,School of Energy & Mechanical Engineering
[2] Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,undefined
[3] Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province,undefined
来源
Korean Journal of Chemical Engineering | 2016年 / 33卷
关键词
Elemental Mercury; Mn-doped Titanium Dioxide; Catalytic Oxidation; Removal;
D O I
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中图分类号
学科分类号
摘要
Titanium dioxide (TiO2) and Mn-doped TiO2 (Mn(x)-TiO2) were synthesized in a sol-gel method and characterized by BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Gasphase elemental mercury (Hg0) oxidation and capture by the Mn-doped TiO2 catalyst was studied in the simulated flue gas in a fixed-bed reactor. The investigation of the influence of Mn loading, flue gas components (SO2, NO, O2, and H2O) showed that the Hg0 capture capability of Mn(x)-TiO2 was much higher than that of pure TiO2. The addition of Mn inhibits the grain growth of TiO2 and improves the porous structure parameters of Mn(x)-TiO2. Excellent Hg0 oxidation performance was observed with the catalyst with 10% of Mn loading ratio and 97% of Hg0 oxidation was achieved under the test condition (120 °C, N2/6%O2). The presence of O2 and NO had positive effect on the Hg0 removal efficiency, while mercury capture capacity was reduced in the presence of SO2 and H2O. XPS spectra results reveal that the mercury is mainly present in its oxidized form (HgO) in the spent catalyst and Mn4+ doped on the surface of TiO2 is partially converted into Mn3+ which indicates Mn and the lattice oxygen are involved in Hg0 oxidation reactions.
引用
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页码:1823 / 1830
页数:7
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