Influence of flue gas components on the mercury adsorption/oxidation by mechanochemical S2Cl2-modified sawdust coke. (15th March 2023)

• Record Type: Journal Article
• Authors: Luo, Hui; Zhao, Shilin; Ma, Anjun; Sun, Kang; Zhu, Yanqun; Sun, Zhiqiang
• Is Part Of: Fuel. Volume 336(2023)
• Publication Date: 2023-03-15
• Subjects: Flue gas component -- Sawdust coke -- Mechanochemical method -- Mercury adsorption -- Mercury oxidation; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.127154
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Effects of O2, CO2, SO2 and NO on the Hg 0 removal characteristics of S2 Cl2 -MC were revealed. Hg 0 removal characteristics were discussed by Hg 0 removal efficiency, Hg 2+ escape ratio, and Hg 0 adsorption amount. O2 + CO2, 1200 ppm SO2, NO promote Hg 0 removal while O2 and low-concentration SO2 have little effect. Adsorbent surface structure plays an important role in the Hg 0 adsorption. Abstract: The effects of flue gas components (O2, CO2, SO2 and NO) on the Hg 0 removal of mechanochemical S2 Cl2 -modified BC (S2 Cl2 -MC) were explored based on the Hg 0 removal efficiency/amount, Hg 0 adsorption amount and Hg 2+ escape amount/ratio. The BET, FTIR, XPS, and Hg-TPD were used to obtain relevant physicochemical properties. It shows O2 and CO2 promote the Hg 2+ escape but inhibit Hg 0 adsorption. O2 slightly affects Hg 0 removal, while CO2 promotes it. 400 ∼ 800 ppm SO2 slightly affect Hg 0 removal, while 1200 ppm SO2 facilitates Hg 2+ escape and Hg 0 adsorption. SO2 affects Hg 2+ escape ratio little. As NO concentration increases, the Hg 2+ escape is promoted while Hg 0 adsorption is inhibited. O2 and CO2 do not change the mercury forms. SO2 and NO promote the production of HgSO4 and Hg(NO3 )2, respectively. The Hg 0 adsorption might mainly depend on the physical properties of adsorbents.