Abstract
Fe2O3 and CeO2 modified activated coke (AC) synthesized by the equivalent-volume impregnation were employed to remove elemental mercury (Hg0) from simulated flue gas at a low temperature. Effects of the mass ratio of Fe2O3 and CeO2, reaction temperature, and individual flue gas components including O2, NO, SO2, and H2O (g) on Hg0 removal efficiency of impregnated AC were investigated. The samples were characterized by Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Results showed that with optimal mass percentage of 3 % Fe2O3 and 3 % CeO2 on Fe3Ce3/AC, the Hg0 removal efficiency could reach an average of 88.29 % at 110 °C. Besides, it was observed that O2 and NO exhibited a promotional effect on Hg0 removal, H2O (g) exerted a suppressive effect, and SO2 showed an insignificant inhibition without O2 to some extent. The analysis of XPS indicated that the main species of mercury on used Fe3Ce3/AC was HgO, which implied that adsorption and catalytic oxidation were both included in Hg0 removal. Furthermore, the lattice oxygen, chemisorbed oxygen, and/or weakly bonded oxygen species made a contribution to Hg0 oxidation.
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The project is supported by the National Natural Science Foundation of China (51278177, 51478173) and the National High Technology Research and Development Program of China (863 Program, No. 2011AA060803).
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Wang, Y., Li, C., Zhao, L. et al. Study on the removal of elemental mercury from simulated flue gas by Fe2O3-CeO2/AC at low temperature. Environ Sci Pollut Res 23, 5099–5110 (2016). https://doi.org/10.1007/s11356-015-5717-7
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DOI: https://doi.org/10.1007/s11356-015-5717-7