Hg0 removal performance and mechanisms of FeOCl regulated by CuCl2. Issue 6 (December 2022)

• Record Type: Journal Article
• Authors: Xu, Bo; Shi, Wan-Yuan; Sun, Wan; Pan, Liang-Ming
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 6(2022)
• Publication Date: 2022-12
• Subjects: Hg0 removal -- SO2 resistance -- O2 adsorption -- CuCl2 doping -- FeOCl-based sorbents; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108896
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Pure FeOCl has a low Hg 0 adsorption capacity and the complex flue gas environment further hinders its practical application to mercury removal. This paper proposes that CuCl2 is used to regulate the Hg 0 chemisorption capacity of FeOCl. The experimental results found that when the CuCl2 to FeCl3 mass ratio was 2:1, the efficiency of Hg 0 removal reached 100% at 140–160 °C. In addition, the sulfur resistance and O2 adsorption capacity of FeOCl are enhanced by doping with CuCl2 . The adaptability of FeOCl-based sorbents to complex flue gas environments was significantly improved. The regulation mechanisms of CuCl2 were clarified by density functional theory. This work addresses the low sulfur resistance and low chemisorption capacity of FeOCl-based sorbents and provides an effective solution for mercury removal in complex flue gas environments. Highlights: CuCl2 dopant improved Hg 0 chemisorption capacity of FeOCl by reducing energy barrier of HgCl formation. The doping of CuCl2 significantly improves the sulfur resistance of FeOCl. FeOCl based adsorbent was synthesized by a one-step solution evaporation method. CuCl2 dopant regulated O2, SO2 and Hg 0 adsorption capacities of FeOCl by increasing adsorption site electronegativity.