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<p>Purifying C<sub>2</sub>H<sub>2</sub> by removing trace CO<sub>2</sub> is critically needed yet challenged by their analogous physical properties. Herein, we report a commercial resin adsorbent HP20 (Diaion® HP-20 Resin) loaded with polyethyleneimine (PEI@HP20) which selectively captures trace CO<sub>2</sub> and excludes C<sub>2</sub>H<sub>2</sub>. PEI@HP20 possesses a high CO<sub>2</sub> adsorption capacity (4.35 mmol/g) at 100 kPa and 298 K and a record CO<sub>2</sub>/C<sub>2</sub>H<sub>2</sub> uptake ratio compared with all reported CO<sub>2</sub>-selective adsorbents. The ideal adsorbed solution theory selectivity reaches 1.33×10<sup>7</sup>. The pilot-scale pressure-temperature swing adsorption on 2 kg PEI@HP20 further validated that it can obtain &gt;99.99% purity C<sub>2</sub>H<sub>2</sub> from CO<sub>2</sub>/C<sub>2</sub>H<sub>2</sub>(1/99, v/v) mixtures with a high yield of 344.7 g per cycle. The combination of multinuclear solid-state Nuclear Magnetic Resonance, Fourier Transform infrared spectroscopy and density functional theory calculations reveal that the performance of PEI@HP20 relies on a dual chemisorption/physisorption mechanism. This work highlights a promising method to develop green, low cost, high efficiency, and readily scalable CO<sub>2</sub>-selective adsorbent.</p>

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Benchmarking selective capture of trace CO2 from C2H2 using an amine-functionalized adsorbent

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月16日

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  • Jin-Sheng Zou,
  • Zhi-Peng Wang,
  • Yassin H. Andaloussi,
  • Jiapeng Xue,
  • Wanli Zhang,
  • Bryan E. G. Lucier,
  • Zeyang Zhang,
  • Yanan Jia,
  • Xue-Cui Wu,
  • Jiahan Li,
  • Yining Huang,
  • Michael J. Zaworotko,
  • Guangjin Chen,
  • Shoushun Chen,
  • Yun-Lei Peng

摘要

Purifying C2H2 by removing trace CO2 is critically needed yet challenged by their analogous physical properties. Herein, we report a commercial resin adsorbent HP20 (Diaion® HP-20 Resin) loaded with polyethyleneimine (PEI@HP20) which selectively captures trace CO2 and excludes C2H2. PEI@HP20 possesses a high CO2 adsorption capacity (4.35 mmol/g) at 100 kPa and 298 K and a record CO2/C2H2 uptake ratio compared with all reported CO2-selective adsorbents. The ideal adsorbed solution theory selectivity reaches 1.33×107. The pilot-scale pressure-temperature swing adsorption on 2 kg PEI@HP20 further validated that it can obtain >99.99% purity C2H2 from CO2/C2H2(1/99, v/v) mixtures with a high yield of 344.7 g per cycle. The combination of multinuclear solid-state Nuclear Magnetic Resonance, Fourier Transform infrared spectroscopy and density functional theory calculations reveal that the performance of PEI@HP20 relies on a dual chemisorption/physisorption mechanism. This work highlights a promising method to develop green, low cost, high efficiency, and readily scalable CO2-selective adsorbent.