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<p>Efficient adsorptive separation of acetylene (C<sub>2</sub>H<sub>2</sub>) from carbon dioxide (CO<sub>2</sub>) at elevated temperatures, which signifies saved energy consumption, remains a formidable challenge due to the thermal instability of host–guest interactions in conventional adsorbents. Inspired by the stability of linear molecular assemblies observed in polymer systems, we report a microporous crystal, <b>NTU-103</b>, whose one-dimensional (1D) helical flow-channel shapes adsorbed C<sub>2</sub>H<sub>2</sub> molecules into a “nanowire”-like structure stabilized by synergistic host–guest and guest–guest interactions at 348 K, while isolating CO<sub>2</sub>. This unique confinement mechanism, confirmed by varied-temperature in-situ crystallographic, infrared spectroscopic analyses and modeling calculations, enables the robust <b>NTU-103</b> to achieve a high C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> selectivity (up to 96) and cyclable breakthrough separation performance at industrially preferred conditions (348 K). This work addresses a key challenge of high-temperature separation, and provides fundamental insights into shaped gas nanostructures for advancing porous materials targeting challenging separations with minimal energy input.</p>

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Nanowire-like C2H2 assembly in a flow-channel crystal boosts C2H2/CO2 separation at 348 K

  • 期刊论文

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  • 发表日期：

    2026年7月14日

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  • Tingting Liu,
  • Mingxing Zhang,
  • Wei Yang,
  • Kui Tan,
  • Jingui Duan

摘要

Efficient adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) at elevated temperatures, which signifies saved energy consumption, remains a formidable challenge due to the thermal instability of host–guest interactions in conventional adsorbents. Inspired by the stability of linear molecular assemblies observed in polymer systems, we report a microporous crystal, NTU-103, whose one-dimensional (1D) helical flow-channel shapes adsorbed C2H2 molecules into a “nanowire”-like structure stabilized by synergistic host–guest and guest–guest interactions at 348 K, while isolating CO2. This unique confinement mechanism, confirmed by varied-temperature in-situ crystallographic, infrared spectroscopic analyses and modeling calculations, enables the robust NTU-103 to achieve a high C2H2/CO2 selectivity (up to 96) and cyclable breakthrough separation performance at industrially preferred conditions (348 K). This work addresses a key challenge of high-temperature separation, and provides fundamental insights into shaped gas nanostructures for advancing porous materials targeting challenging separations with minimal energy input.