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Negative electrostatic potentials in a Hofmann-type metal-organic framework for efficient acetylene separation

Author

Listed:
  • Yuan Liu

    (Nanchang University)

  • Junhui Liu

    (Nanchang University)

  • Hanting Xiong

    (Nanchang University)

  • Jingwen Chen

    (Nanchang University)

  • Shixia Chen

    (Nanchang University)

  • Zheling Zeng

    (Nanchang University)

  • Shuguang Deng

    (Transport and Energy, Arizona State University)

  • Jun Wang

    (Nanchang University)

Abstract

Efficient adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) or ethylene (C2H4) is industrially important but challenging due to the identical dynamic diameter or the trace amount. Here we show an electrostatic potential compatible strategy in a nitroprusside-based Hofmann-type metal-organic framework, Cu(bpy)NP (NP = nitroprusside, bpy = 4,4’-bipyridine), for efficient C2H2 separation. The intruding cyanide and nitrosyl groups in undulating one-dimensional channels induce negative electrostatic potentials for preferential C2H2 recognition instead of open metal sites in traditional Hofmann-type MOFs. As a result, Cu(bpy)NP exhibits a 50/50 C2H2/CO2 selectivity of 47.2, outperforming most rigid MOFs. The dynamic breakthrough experiment demonstrates a 99.9% purity C2H4 productivity of 20.57 mmol g−1 from C2H2/C2H4 (1/99, v/v) gas-mixture. Meanwhile, C2H2 can also be captured and recognized from ternary C2H2/CO2/C2H4 (25/25/50, v/v/v) gas-mixture. Furthermore, computational studies and in-situ infrared spectroscopy reveal that the selective C2H2 binding arises from the compatible pore electro-environment generated by the electron-rich N and O atoms from nitroprusside anions.

Suggested Citation

  • Yuan Liu & Junhui Liu & Hanting Xiong & Jingwen Chen & Shixia Chen & Zheling Zeng & Shuguang Deng & Jun Wang, 2022. "Negative electrostatic potentials in a Hofmann-type metal-organic framework for efficient acetylene separation," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33271-3
    DOI: 10.1038/s41467-022-33271-3
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    Cited by:

    1. Yong Peng & Hanting Xiong & Peixin Zhang & Zhiwei Zhao & Xing Liu & Shihui Tang & Yuan Liu & Zhenliang Zhu & Weizhen Zhou & Zhenning Deng & Junhui Liu & Yao Zhong & Zeliang Wu & Jingwen Chen & Zhenyu , 2024. "Interaction-selective molecular sieving adsorbent for direct separation of ethylene from senary C2-C4 olefin/paraffin mixture," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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