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Citation: ZHAO Ke, NIU Qing-xin, WANG Li, ZHANG Hua-wei. Effect of water vapor and α-Fe2O3 on elemental mercury removal performance over cerium oxide modified semi coke[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(3): 378-384. shu

Effect of water vapor and α-Fe2O3 on elemental mercury removal performance over cerium oxide modified semi coke

  • College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

  • Corresponding author: ZHANG Hua-wei, sdkdzhw@163.com
  • Received Date: 13 December 2016
    Revised Date: 10 January 2017

    Fund Project: the Natural Science Foundation of China 21276146the Natural Science Foundation of China 51406107Shandong Fund for Distinguished Young Scholars JQ201612

Figures(11)

  • Cerium modified semi coke adsorbent (Ce/SC) was prepared by impregnation method and a bench-scale fixed bed reactor was used to study the effect of H2O vapor and α-Fe2O3 on elemental mercury removal efficiency over Ce/SC. Characterizations of X-ray powder diffraction (XRD), Hydrogen temperature programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the mechanism of elemental mercury removal.The adsorption results showed that H2O had a negative effect on the oxidation activity of the adsorbent. H2O can be dissociated on the surface of CeO2 with partial lattice oxygen transformation into Ce-OH functional groups which led to the decrease of its oxidation activity and thus resulted in the inhibitory effect of mercury removal efficiency. The addition of α-Fe2O3 had no significant effect on mercury removal over Ce/SC. The mercury removal efficiency of Ce/SC was decreased when the water vapor and α-Fe2O3 existed simultaneously. However, the decrease rate was much lower than that of water vapor conditions alone mainly due to the interaction between water vapor and α-Fe2O3 increased the content of the surface chemical adsorbed oxygen and thus the oxidation activity and elemental mercury removal performance of Fe2O3were promoted.
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