Removal of elemental mercury from coal combustion flue gas using bentonite 
modified with Ce-Fe binary oxides

Zhou, Mengli; Xu, Yang; Luo, Guangqian; Zhang, Qingzhu; Du, Lin; Li, Zehua

doi:10.1016/j.apsusc.2022.153090

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Removal of elemental mercury from coal combustion flue gas using bentonite modified with Ce-Fe binary oxides

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Li, Zehua
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Zhou, M., Xu, Y., Luo, G., Zhang, Q., Du, L., & Li, Z. (2022). Removal of elemental mercury from coal combustion flue gas using bentonite modified with Ce-Fe binary oxides. Applied Surface Science, 590: 153090. doi:10.1016/j.apsusc.2022.153090.

Cite as: https://hdl.handle.net/21.11116/0000-000A-32EE-2

Abstract

Mercury removal from coal combustion flue gas remains a great challenge for environmental protection because of the lack of cost-effective sorbents. This study prepared a series of bentonites modified with Ce-Fe binary oxides (Ce_XFe_4-X/Ben) for elemental mercury (Hg⁰) capture from flue gas. The textural properties, crystal structure, magnetic properties, redox properties, and surface chemistry of Ce_XFe_4-X/Ben were characterized. The results testified that modification procedure had little effect on the pore shape and pore size of bentonite. During modification process, a synergistic effect occurred between iron oxide and cerium oxide and Ce-Fe binary oxides entered the interlayer of bentonite. The Ce_XFe_4-X/Ben samples presented far better Hg⁰ removal performance compared with raw, Fe-modified, and Ce-modified bentonite. The optimum Ce/Fe molar ratio and adsorption temperature were 2:2 and 150–200 °C, respectively. O₂, NO, and HCl promoted Hg⁰ removal whereas SO₂ and H₂O inhabited Hg⁰ removal. The Hg⁰ removal process was dominated by heterogeneous adsorption and Ce_XFe_4-X/Ben was used as a sorbent. Furthermore, the Hg⁰ removal mechanism was revealed, where CeO₂ and Fe₂O₃ served as active sites for Hg⁰ removal. Multiple adsorption-regeneration cycles demonstrated that the deactivated Ce_XFe_4-X/Ben could be effectively regenerated after thermal treatment at 400 °C for 1 h under air atmosphere.