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Fine-tuning the pore environment of ultramicroporous three-dimensional covalent organic frameworks for efficient one-step ethylene purification

Author

Listed:
  • Yang Xie

    (Wuhan University)

  • Wenjing Wang

    (Chinese Academy of Sciences)

  • Zeyue Zhang

    (Peking University)

  • Jian Li

    (Peking University
    Stockholm University)

  • Bo Gui

    (Wuhan University)

  • Junliang Sun

    (Peking University)

  • Daqiang Yuan

    (Chinese Academy of Sciences)

  • Cheng Wang

    (Wuhan University)

Abstract

The construction of functional three-dimensional covalent organic frameworks (3D COFs) for gas separation, specifically for the efficient removal of ethane (C2H6) from ethylene (C2H4), is significant but challenging due to their similar physicochemical properties. In this study, we demonstrate fine-tuning the pore environment of ultramicroporous 3D COFs to achieve efficient one-step C2H4 purification. By choosing our previously reported 3D-TPB-COF-H as a reference material, we rationally design and synthesize an isostructural 3D COF (3D-TPP-COF) containing pyridine units. Impressively, compared with 3D-TPB-COF-H, 3D-TPP-COF exhibits both high C2H6 adsorption capacity (110.4 cm3 g−1 at 293 K and 1 bar) and good C2H6/C2H4 selectivity (1.8), due to the formation of additional C-H···N interactions between pyridine groups and C2H6. To our knowledge, this performance surpasses all other reported COFs and is even comparable to some benchmark porous materials. In addition, dynamic breakthrough experiments reveal that 3D-TPP-COF can be used as a robust absorbent to produce high-purity C2H4 directly from a C2H6/C2H4 mixture. This study provides important guidance for the rational design of 3D COFs for efficient gas separation.

Suggested Citation

  • Yang Xie & Wenjing Wang & Zeyue Zhang & Jian Li & Bo Gui & Junliang Sun & Daqiang Yuan & Cheng Wang, 2024. "Fine-tuning the pore environment of ultramicroporous three-dimensional covalent organic frameworks for efficient one-step ethylene purification," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47377-3
    DOI: 10.1038/s41467-024-47377-3
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    1. Hongjian Wang & Yeming Zhai & Yang Li & Yu Cao & Benbing Shi & Runlai Li & Zingting Zhu & Haifei Jiang & Zheyuan Guo & Meidi Wang & Long Chen & Yawei Liu & Kai-Ge Zhou & Fusheng Pan & Zhongyi Jiang, 2022. "Covalent organic framework membranes for efficient separation of monovalent cations," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Xiaoyao Wang & Benbing Shi & Hao Yang & Jingyuan Guan & Xu Liang & Chunyang Fan & Xinda You & Yanan Wang & Zhe Zhang & Hong Wu & Tao Cheng & Runnan Zhang & Zhongyi Jiang, 2022. "Assembling covalent organic framework membranes with superior ion exchange capacity," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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