Study on the removal of elemental mercury from simulated flue gas by Fe^sub 2^O3-CeO2/AC at low temperature

Fe^sub 2^O3 and CeO2 modified activated coke (AC) synthesized by the equivalent-volume impregnation were employed to remove elemental mercury (Hg^sup 0^) from simulated flue gas at a low temperature. Effects of the mass ratio of Fe^sub 2^O3 and CeO2, reaction temperature, and individual flue gas com...

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Bibliographic Details
Published in:Environmental science and pollution research international 2016-03, Vol.23 (6), p.5099
Main Authors: Wang, Yan, Li, Caiting, Zhao, Lingkui, Xie, Yin'e, Zhang, Xunan, Zeng, Guangming, Wu, Huiyu, Zhang, Jie
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Air pollution
Catalytic oxidation
Coal-fired power plants
Efficiency
Environmental science
Extraction processes
Flue gas
Gases
Industrial plant emissions
Limited liability companies
Low temperature
Mercury
Metal oxides
Oxidation
Oxygen
Pollutants
Pollution control
Studies
Sulfur dioxide
X-ray diffraction
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Summary:Fe^sub 2^O3 and CeO2 modified activated coke (AC) synthesized by the equivalent-volume impregnation were employed to remove elemental mercury (Hg^sup 0^) from simulated flue gas at a low temperature. Effects of the mass ratio of Fe^sub 2^O3 and CeO2, reaction temperature, and individual flue gas components including O2, NO, SO2, and H2O (g) on Hg^sup 0^ 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 % Fe^sub 2^O3 and 3 % CeO2 on Fe3Ce3/AC, the Hg^sup 0^ 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 Hg^sup 0^ 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 Hg^sup 0^ removal. Furthermore, the lattice oxygen, chemisorbed oxygen, and/or weakly bonded oxygen species made a contribution to Hg^sup 0^ oxidation.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-015-5717-7