Fengke Wang1, Chaofan Li1, Weizhen Kong1,2, Shucan Qin1,2, Qianqian Peng1,2, Lihua Zang1, Yunqian Ma This email address is being protected from spambots. You need JavaScript enabled to view it.1,2,3, Yi Nie2,3, Guihuan Yan4 

1 College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
2 Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Henan University, Zhengzhou 450000, China
3 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
4 Ecology Institute of Shandong Academy of Science (China-Japan Friendly Biotechnology Research Center, Shandong Academy of Sciences), Jinan 250000, China


Received: November 12, 2023
Revised: January 13, 2024
Accepted: January 20, 2024

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.230264  


Cite this article:

Wang, F., Li, C., Kong, W., Qin, S., Peng, Q., Zang, L., Ma, Y., Nie, Y., Yan, G. (2024). Flexible Dual Fe-based Catalyst: MIL-53(Fe) Loaded with Deep Eutectic Solvent for Discontinuous Selective Oxidation of H2S. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.230264


HIGHLIGHTS

  • Flexible dual Fe-based DES@MOF efficiently removed H2S in discontinuous process.
  • DES could effectively improve oxidation of H2S as the guest molecular in catalyst.
  • Flexible MOF could effectively relieve passivation of catalyst as the supporting material.
  • Fe components of DES and MOF in catalysts do not play the same role.
 

ABSTRACT


Deep eutectic solvent (DES) as the guest molecule and flexible Metal-organic framework (MOF) as the supporting material can be used to provide an efficient catalyst: flexible dual Fe-based DES@MOF, which can efficiently remove H2S in discontinuous removal process (100-180°C). The materials were characterized by XRD SEM, FT-IR, BET, XPS, TG, CV and Py-FTIR. According to the result, MOF (MIL-53(Fe)) incorporating 30 wt% DES (ChCl/FeCl3) exhibited the best H2S removal performance at 180°C, with the H2S removal capacity of 2527 mg mL-1 (3744 mg g-1). And the H2S removal capacity reduced by 9% after two cycles of thermal regeneration. The process of desulfurization includes two stages: catalytic oxidation and adsorption, which are determined by the Fe3+ in DES and the structural characteristics, such as the aggregation of mesopores, respectively. For MIL-53(Fe), FeOOH as an intermediate and Lewis acid sites also played a catalytic role. Elemental sulfur was the predominant product with a small amount of sulfate. Both elemental sulfur and DES can induce the flexible deformation of MOF as the guest molecule to relieve the passivation of catalyst.


Keywords: Deep eutectic solvent, Metal-organic framework, Catalytic oxidation, H2S removal, Flexible deformation




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