Highly porous metal-organic framework glass design and application for gas separation membranes

Shichun Li (), Chao Ma, Jingwei Hou, Shuwen Yu, Aibing Chen, Juan Du, Philip A. Chater, Dean S. Keeble, Zhihua Qiao (), Chongli Zhong, David A. Keen, Yu Liu and Thomas D. Bennett ()
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Shichun Li: China Academy of Engineering Physics
Chao Ma: Tiangong University
Jingwei Hou: The University of Queensland
Shuwen Yu: The University of Queensland
Aibing Chen: Hebei University of Science and Technology
Juan Du: Hebei University of Science and Technology
Philip A. Chater: Didcot
Dean S. Keeble: Didcot
Zhihua Qiao: Tiangong University
Chongli Zhong: Tiangong University
David A. Keen: Didcot
Yu Liu: China Academy of Engineering Physics
Thomas D. Bennett: University of Cambridge

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Crystalline metal-organic frameworks (MOFs) exhibit enormous potential application in gas separation, thanks to their highly porous structures and precise pore size distributions. Nevertheless, the inherent limitations in mechanical stability of crystalline MOFs cause challenges in processing MOF powders into bulky structures, particularly for membrane filtrations. Melt-quenched MOF glasses boast excellent processability due to liquid-like properties. However, the melting process diminishes the inherent porosity, leading to reduced gas adsorption capacities and lower gas diffusion coefficients. In this work, we demonstrated that enhancing the porosity of MOF glasses is achievable through topological engineering on the crystalline precursors. Crystalline zeolitic imidazolate frameworks (ZIFs) with large 12-membered rings pores, including AFI and CAN topology, were synthesized by using both structure-directing agents and mixed organic ligands. The large pores are partially preserved in the melt-quenched glass as evidenced by high-pressure CO2 absorption at 3000 kPa. The agAFI-[Zn(Im)1.68(bIm)0.32] glass was then fabricated into self-supported membranes, which shows high gas separation performance, for example, CO2 permeance of 3.7 × 104 GPU with a CO2/N2 selectivity of 14.8.

Date: 2025
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DOI: 10.1038/s41467-025-56295-x

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