Simultaneous Removal of Elemental Mercury and Arsine from a Reducing Atmosphere Using Chloride and Cerium Modified Activated Carbon

  • Yingjie Zhang
    Yingjie Zhang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
  • Ping Ning
    Ping Ning
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    More by Ping Ning
  • Xueqian Wang*
    Xueqian Wang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    *E-mail: [email protected]
    More by Xueqian Wang
  • Langlang Wang
    Langlang Wang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
  • Yibing Xie
    Yibing Xie
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    More by Yibing Xie
  • Qiang Ma
    Qiang Ma
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    More by Qiang Ma
  • Rui Cao
    Rui Cao
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    More by Rui Cao
  • , and 
  • Hang Zhang
    Hang Zhang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    More by Hang Zhang
Cite this: Ind. Eng. Chem. Res. 2019, 58, 51, 23529–23539
Publication Date (Web):November 25, 2019
https://doi.org/10.1021/acs.iecr.9b04999
Copyright © 2019 American Chemical Society
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Abstract

With the goal of simultaneous removal of elemental mercury and arsine from simulated yellow phosphorus off-gas, a series of Cl–Ce modified activated carbon samples were prepared via an impregnation method and investigated. The Cl3–Ce10/AC exhibited the best performance at 150 °C, with an Hg0 removal efficiency of 92.2%, and the reaction time of AsH3 removal efficiency greater than 90% was 15.5 h. The presence of Hg0 had little impact on AsH3 removal, but conversely AsH3 significantly reduced Hg0 removal efficiency. The effects of individual flue gas components on the simultaneous removal of Hg0 and AsH3 were also studied. O2 clearly promoted the simultaneous removal of Hg0 and AsH3 and CO had almost no influence, while H2S and water vapor inhibited the removal process. The physicochemical properties of the samples were characterized using BET, FESEM-EDS, XRD, and XPS. By combining experimental results with physical and chemical characterization, a mechanism for simultaneous removal of Hg0 and AsH3 was proposed. It was found that chemical adsorption and catalytic oxidation occurred on the surface of the samples, due to the presence of chlorine covalent bonds and cerium oxides, and that the presence of cerium makes it easier for mercury to combine with chlorine. The main products in the used samples were found to be HgCl2, HgO, and As2O3.

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