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

Author

Listed:
  • Jin-Sheng Zou

    (China University of Petroleum-Beijing)

  • Zhi-Peng Wang

    (Lanzhou University)

  • Yassin H. Andaloussi

    (University of Limerick)

  • Jiapeng Xue

    (Lanzhou University)

  • Wanli Zhang

    (London)

  • Bryan E. G. Lucier

    (London)

  • Zeyang Zhang

    (China University of Petroleum-Beijing)

  • Yanan Jia

    (China University of Petroleum-Beijing)

  • Xue-Cui Wu

    (China University of Petroleum-Beijing)

  • Jiahan Li

    (China University of Petroleum-Beijing)

  • Yining Huang

    (London)

  • Michael J. Zaworotko

    (University of Limerick)

  • Guangjin Chen

    (China University of Petroleum-Beijing)

  • Shoushun Chen

    (Lanzhou University)

  • Yun-Lei Peng

    (China University of Petroleum-Beijing)

Abstract

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.

Suggested Citation

  • 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 & Guangj, 2025. "Benchmarking selective capture of trace CO2 from C2H2 using an amine-functionalized adsorbent," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57972-7
    DOI: 10.1038/s41467-025-57972-7
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