Construction of Multiple Nonpolar SF6 Nano-Traps by Highly Stable Pyrazole-Based MOFs for SF6 Recovery

2025-01-07

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DOI：10.1002/smll.202409215

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Sulfur hexafluoride (SF6), widely used in electric power systems, is one of the most potent greenhouse gases. Efficient separation of SF6/N-2 by adsorptive separation technology based on porous materials is of great significance in the industry yet remains a daunting challenge. Herein, a novel strategy is introduced to construct unique pore channels with multiple SF6 nano-traps by precisely selecting bipyrazole ligands to design the nonpolar surface of microporous metal-organic frameworks (MOFs), which significantly enhances the material's affinity for SF6. A series of ultra-stable bipyrazole-based MOFs, M(BPZ) (M=Co, Ni, Zn), are synthesized and investigated. Among these three materials, Co(BPZ) and Zn(BPZ) show excellent SF6 uptakes of 2.47 and 2.39 mmol g(-1) at 298 K and 0.1 bar while Co(BPZ) exhibits the highest SF6/N-2 (10/90, v/v) IAST selectivity of 748. Breakthrough experiments reveal that SF6/N-2 mixtures can be efficiently separated by Co(BPZ) with a high SF6 (>= 99.5 %) productivity of 46.1 L kg(-1). Theoretical calculations suggest that SF6 preferably adsorbs in the channels through multiple S-Fpi (pyrazole rings) van der Waals interactions. This work provides a straightforward approach for exploring adsorbents in efficient SF6/N-2 separation.

Keywords:

adsorptive separation

metal & horbar

organic frameworks

SF6/N-2 separation

sulfur hexafluoride

Construction of Multiple Nonpolar SF6 Nano-Traps by Highly Stable Pyrazole-Based MOFs for SF6 Recovery

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