GASEOUS ELEMENTAL MERCURY CAPTURE BY NOVEL COPPER-DOPED (Fe2.2Mn0.8)1−δO4 ADSORBENTS

Ping He, Zhongzhi Zhang, Xianbing Zhang, Jiang Wu and Naichao Chen
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Ping He: School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China
Zhongzhi Zhang: School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China
Xianbing Zhang: School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China
Jiang Wu: School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China
Naichao Chen: School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 05, 1-13

Abstract: A series of (Fe2.2Mn0.8Cux)1−δO4 (x=0, 0.2, 0.5, and 0.8) was synthesized for elemental mercury capture. The as-synthesized adsorbents were characterized by Brunauer–Emmett–Teller (BET), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The experimental results show that (Fe2.2Mn0.8Cu0.5)1−δO4 catalyst adsorbent exhibits the best elemental mercury capture capacity with the increase in mercury removal efficiency by 20% as compared to the (Fe2.2Mn0.8)1−δO4 adsorbent. The XPS results indicate Cu dopant can provide the lattice oxygen on the adsorbent surface due to the transformation from Cu2+ cations to Cu+ cations, which increases the active sites for elemental mercury adsorption. The Mn4+ cations on the adsorbent surface may oxidize the adsorbed mercury to mercury oxidization. Meanwhile, the Mn3+ cations formed are also oxidized to the Mn4+ cations by the gaseous oxygen phase in the reactor gas. However, the large Cu content may block the collision between Mn4+ cations and adsorbed mercury, and thus decrease the oxidization capability of adsorbent surface for mercury. Therefore, the Cu dopant with the suitable content may be a potential modified method for the adsorbent to further increase the elemental mercury capture.

Keywords: (Fe2.2Mn0.8Cux)1−δO4 adsorbent; mercury; copper; manganese; oxidization (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501950

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