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Adsorption and oxidation of elemental mercury from coal-fired flue gas over activated coke loaded with Mn–Ni oxides

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Abstract

A series of Mn–Ni/AC (AC, activated coke) catalysts were synthesized by the impregnation method for the removal of elemental mercury (Hg0) from simulated flue gas. The samples were characterized by BET, ICP-OES, SEM, XRD, XPS, H2-TPR, FT-IR, and TGA. Mn6Ni0.75/AC exhibited optimal removal efficiency of 96.6% in the condition of 6% O2 and balanced in N2 at 150 °C. The experimental results showed that both O2 and NO facilitated Hg0 removal. SO2 could restrain the Hg0 removal in the absence of O2, while the inhibitory effect of SO2 was weakened with the aid of 6% O2. In addition, H2O exhibited a slightly negative influence on Hg0 removal. The characterization of the samples indicated that Mn6Ni0.75/AC possessed larger specific surface area, higher dispersion of metal oxides, and stronger redox ability. In the meantime, the results of XPS and FT-IR demonstrated that the lattice oxygen and chemisorbed oxygen made contributions to Hg0 removal and the consumed oxygen could be compensated by the redox cycle of metal oxides and gas-phase O2. Meanwhile, the mechanisms of Hg0 removal were proposed based on the above studies.

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Funding

This work was financially supported by the National Key Research and Development Program of China (2016YFC0204100).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People’s Republic of China

    Qiang Zeng, Caiting Li, Shanhong Li, Miao Liu, Xueyu Du, Lei Gao & Yunbo Zhai

  2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People’s Republic of China

    Qiang Zeng, Caiting Li, Shanhong Li, Miao Liu, Xueyu Du, Lei Gao & Yunbo Zhai

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  1. Qiang Zeng
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  2. Caiting Li
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  3. Shanhong Li
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  4. Miao Liu
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  5. Xueyu Du
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  6. Lei Gao
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  7. Yunbo Zhai
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Correspondence to Caiting Li or Shanhong Li.

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Zeng, Q., Li, C., Li, S. et al. Adsorption and oxidation of elemental mercury from coal-fired flue gas over activated coke loaded with Mn–Ni oxides. Environ Sci Pollut Res 26, 15420–15435 (2019). https://doi.org/10.1007/s11356-019-04864-1

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