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

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 () and Yun-Lei Peng ()
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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

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-57972-7

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