Citation: Muzi Li, Xin Zhang, Xiang-Jing Kong, Qiancheng Chen, Xuefeng Bai, Tao He, Jian-Rong Li. Ion exchange for enhancing MOF adsorbents performance in humid C₂H₂/CO₂ separation[J]. Chinese Chemical Letters, ;2026, 37(3): 110709. doi: 10.1016/j.cclet.2024.110709 shu

Ion exchange for enhancing MOF adsorbents performance in humid C₂H₂/CO₂ separation

Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemical Engineering, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

hetao@bjut.edu.cn

Received Date: 1 October 2024
Revised Date: 22 November 2024
Accepted Date: 3 December 2024
Available Online: 4 December 2024

Figures(4)

The gas separation performance of metal-organic framework (MOF) adsorbents could be enhanced by tuning the pores, whereas the presence of moisture usually compromises the efficiency. Herein, two MOFs, Fe-BDC-TPT-BF₄, Ni-BDC-TPT-TMA (TMA⁺ = (CH₃)₄N⁺), were synthesized by exchanging countering ions in parent MOFs, Fe-BDC-TPT-Cl and Ni-BDC-TPT-Me₂NH₂, respectively. Fe-BDC-TPT-BF₄ and Ni-BDC-TPT-TMA exhibited a high C₂H₂ adsorption uptake of 203.1 cm³/g and 200.1 cm³/g at 298 K and 1 bar, and high C₂H₂/CO₂ selectivity of 4.6 and 4.4. Humid breakthrough experiments revealed that high C₂H₂ productivity of high C₂H₂ purity was achieved on Ni-BDC-TPT-TMA at 35% relative humidity. Cycling dynamic breakthrough experiments demonstrate good recyclability of Ni-BDC-TPT-TMA for humid C₂H₂/CO₂ separation. The alteration of countering ions changed the pore size and chemistry, leading to high C₂H₂ uptake, high C₂H₂ selectivity, and retained performance in the presence of moisture, making it a promising candidate for practical applications. This work highlights that ion exchange modification of MOFs has been developed as a facile and powerful strategy to optimize the inner pores for better performance in challenging separations.
- Metal-organic framework,
- Ion exchange,
- Acetylene purification,
- C₂H₂/CO₂ separation,
- Humid condition
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Ion exchange for enhancing MOF adsorbents performance in humid C₂H₂/CO₂ separation