Magnetic γ-Fe2O3-Loaded Attapulgite Sorbent for Hg0 Removal in Coal-Fired Flue Gas

Dong, Lu; Huang, Yaji; Chen, Hao; Liu, Lingqin; Liu, Changqi; Xu, Ligang; Zha, Jianrui; Wang, Yongxing; Liu, Hao

Abstract

A magnetically recoverable composite mercury removal sorbent was produced by introducing magnetic γ-Fe2O3 into attapulgite (ATT) (xFe1ATT) via the co-precipitation method and used to remove Hg0 in the simulated coal-fired power plant flue gas. The as-prepared 0.5Fe1ATT sorbent was characterized by X-ray diffraction, Brunauer–Emmett–Teller, transmission electron microscopy, vibrating sample magnetometer, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy analyses. The results showed that the Hg0 removal performance of the composite of γ-Fe2O3 and ATT was significantly promoted in comparison to pure γ-Fe2O3 and ATT individually. A relatively high magnetization value and good Hg0 removal performance were obtained by the sample of 0.5Fe1ATT. O2 could enhance Hg0 removal activity via the Mars–Maessen mechanism. NO displayed a significant promotion effect on Hg0 removal as a result of the formation of active species, such as NO2 and NO+. SO2 inhibited the removal of Hg0 as a result of its competition adsorption against Hg0 for the active sites and the sulfation of the sorbent. However, the introduction of NO could obviously alleviate the adverse effect of SO2 on the Hg0 removal capability. H2O showed a prohibitive effect on Hg0 removal as a result of its competition with Hg0 for the active sites. The findings of this study are of fundamental importance to the development of efficient and economic magnetic mercury sorbents for Hg0 removal from coal-fired boiler flue gases.

Citation

Dong, L., Huang, Y., Chen, H., Liu, L., Liu, C., Xu, L., Zha, J., Wang, Y., & Liu, H. (2019). Magnetic γ-Fe2O3-Loaded Attapulgite Sorbent for Hg0 Removal in Coal-Fired Flue Gas. Energy and Fuels, 33(8), 7522-7533. https://doi.org/10.1021/acs.energyfuels.9b01136

• Journal Article Type: Article
• Acceptance Date: Jul 16, 2019
• Online Publication Date: Jul 16, 2019
• Publication Date: Jul 16, 2019
• Deposit Date: Aug 9, 2019
• Publicly Available Date: Jul 17, 2020
• Journal: Energy & Fuels
• Print ISSN: 0887-0624
• Electronic ISSN: 1520-5029
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 33
• Issue: 8
• Pages: 7522-7533
• DOI: https://doi.org/10.1021/acs.energyfuels.9b01136
• Keywords: Fuel Technology; Energy Engineering and Power Technology; General Chemical Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/2412202
• Publisher URL: https://pubs.acs.org/doi/10.1021/acs.energyfuels.9b01136
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy and Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.energyfuels.9b01136
• Contract Date: Aug 14, 2019