Catalytic Oxidation and Desulfurization of Calcium-Hydroxide Gypsum Wet Flue Gas Using Modified MIL-53(Fe)

Yong Yao, Shizhu Li, Chuangting Chen, Dongchen Zheng, Zhichao Wu, Chi Yu, Shuying Pu and Fa-Qian Liu ()
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Yong Yao: Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
Shizhu Li: Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
Chuangting Chen: Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
Dongchen Zheng: School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
Zhichao Wu: Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
Chi Yu: Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
Shuying Pu: School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
Fa-Qian Liu: School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

Energies, 2022, vol. 15, issue 16, 1-14

Abstract: MIL-53(Fe) was prepared and modified with benzoic acid to prepare MIL-53(Fe)-BA additive, which was used to improve the catalytic oxidation rate of sulfite, prevent the scaling of the desulfurization tower, and improve the desulfurization efficiency during the wet flue gas desulfurization (WFGD) process of power plants. MIL-53(Fe)-BA exhibits abundant Lewis acid sites because of the appearance of coordination unsaturated Fe atoms. Due to the excellent sorption capacity, Ca(OH) 2 was used as the main SO 2 desulfurizer. The composite desulfurizers were prepared by mixing MIL-53(Fe)-based additives and Ca(OH) 2 , and were characterized by SEM, XRD, and FT-IR. A desulfurization unit was set up at laboratory scale to study the effect of catalytic oxidation additives on sulfite oxidation and desulfurization efficiency. The results showed that the addition of MIL-53(Fe)-BA can increase the oxidation capacity of sulfite by 159%, and greatly improve the desulfurization efficiency. These composite desulfurizers broaden the adaptability of the desulfurizing system to high-sulfur coals, and provide support for improving the desulfurizing efficiency of power plants.

Keywords: catalytic oxidation; oxidative desulfurization; wet flue gas desulfurization; calcium hydroxide; MIL-53(Fe); Lewis acid sites (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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