The novel magnetic adsorbent derived from MIL-100 (Fe) loading with bimetallic Cu and Mn oxides for efficient Hg0 removal from flue gas. (1st December 2022)

• Record Type: Journal Article
• Authors: Wang, Dapeng; Jing, Zhenqi; Wang, Yaqin; Liu, Tianyu; Zhang, Bohan; Wen, Chang
• Is Part Of: Journal of cleaner production. Volume 377(2022)
• Publication Date: 2022-12-01
• Subjects: Mercury removal -- MIL-100(Fe) -- Bimetallic oxide copper−manganese -- Flue gas compositions -- Removal mechanisms; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.134384
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: A novel magnetic adsorbent derived from MIL-100(Fe) loading with bimetallic Cu and Mn oxides, namely CuMnOx/MIL-100(Fe), was easily synthesized and used to remove elemental mercury (Hg 0 ) from flue gas. Different mass loadings of CuMnOx (3%, 6%, and 9%) were impregnated on MIL-100(Fe) and calcinated at 200–500 °C to form CuMnOx/MIL-100(Fe), which was used to inspect Hg 0 removal efficiencies at different reaction temperatures (40–200 °C). The Hg 0 removal performance was studied through a variety of characterizations, including XRD, BET, SEM-EDS, TGA, XPS, VSM, H2 -TPR, and Hg-TPD. 6%CuMnOx/MIL-100(Fe) calcined at 500 °C had a superior Hg 0 removal efficiency of 92.4% and capacity of 1.16 mg/g at 120 °C, indicating that high-temperature calcination and bimetal loading were capable of improving the catalytic activity of MIL-100(Fe) and thereby improving the removal efficiency of Hg 0 at a relatively low operating temperature of 120 °C. Under different flue conditions, the increase in O2 and NO concentrations can obviously promote the removal efficiency of Hg 0, while SO2 and H2 O had an opposite trend. The Hg 0 removal efficiency remained above 90% after 8 cycles, which exhibits potential for industrial application. Furthermore, the Hg 0 removal mechanism was attributed to the reaction with chemisorbed oxygen or lattice oxygen to form HgO on CuMnOx/MIL-100(Fe), which follows the Langmuir-Hinshelwood and Mars-Maessen mechanism. Graphical abstract: Image 1 Highlights: Composites are synthesized by the calcination of CuMnOx and MIL-100(Fe) template. The collaboration of Cu-Mn-Fe sites promote Hg 0 removal. Composites have low temperature activity of 120 °C. Composites are magnetism and shows great regeneration.