Abstract
Membrane-based approaches can offer energy-efficient and cost-effective methods for various separation processes. Practical membranes must have high permselectivity at industrially relevant high pressures and under aggressive conditions, and be manufacturable in a scalable and robust fashion. We report a versatile electrochemical directed-assembly strategy to fabricate polycrystalline metal–organic framework membranes for separation of hydrocarbons. We fabricate a series of face-centred cubic metal–organic framework membranes based on 12-connected rare-earth or zirconium hexanuclear clusters with distinct ligands. In particular, the resultant fumarate-based membranes containing contracted triangular apertures as sole entrances to the pore system enable molecular-sieving separation of propylene/propane and butane/isobutane mixtures. Prominently, increasing the feed pressure to the industrially practical value of 7 atm promoted a desired enhancement in both the total flux and separation selectivity. Process design analysis demonstrates that, for propylene/propane separation, the deployment of such face-centred cubic Zr-fumarate-based metal–organic framework membranes in a hybrid membrane–distillation system offers the potential to decrease the energy input by nearly 90% relative to a conventional single distillation process.
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Acknowledgements
The authors thank King Abdullah University of Science and Technology (KAUST) for financial support.
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M.E. conceived, designed and guided the whole project. S.Z. fabricated the polycrystalline membranes and performed the permeation tests. S.Z. and J.J. proposed the membrane synthesis routes. S.Z. calculated the two guidelines for membrane preparations. O.S., J.C.-J. and P.M.B. assisted with instrument development. S.Z., O.S., J.J. and M.E. discussed the presented findings. A.R., P.M.B. and J.G. contributed to the process simulations. S.Z., O.S. and M.E. coordinated the writing of the paper, and all authors contributed to revising the paper.
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Zhou, S., Shekhah, O., Jia, J. et al. Electrochemical synthesis of continuous metal–organic framework membranes for separation of hydrocarbons. Nat Energy 6, 882–891 (2021). https://doi.org/10.1038/s41560-021-00881-y
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DOI: https://doi.org/10.1038/s41560-021-00881-y
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