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

ZHAO Ke; NIU Qing-xin; WANG Li; ZHANG Hua-wei

Volume 45 Issue 3

Mar. 2017

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Article Navigation > Journal of Fuel Chemistry and Technology > 2017 > 45(3): 378-384

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.

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.

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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

Funds:

the Natural Science Foundation of China 51406107

the Natural Science Foundation of China 21276146

Shandong Fund for Distinguished Young Scholars JQ201612

Received Date: 2016-12-13
Rev Recd Date: 2017-01-10

Available Online: 2021-01-23

Publish Date: 2017-03-10

Abstract

Abstract

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.
- water vapor,
- Fe₂O₃,
- modified semi coke,
- elemental mercury

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References(34)

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