Review on adsorbents in elemental mercury removal in coal combustion flue gas, smelting flue gas and natural gas

[Display omitted] •The discrepancy of the application environment demands different characteristics of adsorbents.•The demercuration barriers, stabilization of mercury-containing compounds and regeneration are summarized.•Structure, hydrophobic groups and modification could purposefully overcome the...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-02, Vol.454, p.140095, Article 140095
Hauptverfasser: Liu, Ting, Xiong, Zhuo, Ni, Peng, Ma, Zizhen, Tan, Yan, Li, Zishun, Deng, Shengnan, Li, Yincui, Yang, Qirong, Zhang, Huawei
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Sprache:eng
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Zusammenfassung:[Display omitted] •The discrepancy of the application environment demands different characteristics of adsorbents.•The demercuration barriers, stabilization of mercury-containing compounds and regeneration are summarized.•Structure, hydrophobic groups and modification could purposefully overcome the bottleneck of H2O and SO2.•The thermal treatment accompanied by different components has been widely adopted as an efficient approach for regeneration. Gaseous elemental mercury (Hg0) is a hazardous global pollutant and difficult to curb. Adsorbent is now attracting great attention in capturing Hg0 because of its recovery and system flexibility. However, the discrepancy of the application environment and competitive gas demand differential treatments on the adsorbents. In this review the current situation of Hg0 removal on different kinds of adsorbents in coal combustion flue gas, smelting flue gas and natural gas are focused. Hydrophobic groups, hydrophobic materials and modification of sulfur/selenium pretreatment and metals loading could purposefully and effectively overcome the problem of H2O and SO2. Stabilization of the mercury-laden compounds, toxicity tests of mercury-containing compounds and leaching characteristics could provide a practical perspective to the safe disposal of mercury-containing waste, reducing the risk of mercury contamination. Additionally, separation, regeneration, and recovery, are explored and summarized, in which the thermal treatment accompanied by different components has been widely adopted as an efficient approach to recover the adsorption ability. Finally, a basic understanding and outlook on demercurationis put forward.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2022.140095