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<p>Helium is a finite but essential resource with important applications in medicine, research, and aerospace. Conventional He-upgrading from natural methane gas (CH<sub>4</sub>) is done by cryogenic distillation. This study presents energy-efficient He-upgrading by membrane separation using the “dense” metal-organic framework (MOF) MIL-116(Ga), which enables high precision molecular sieving of non-adsorptive gases. MIL-116(Ga) membranes were synthesized on alumina disks after developing a method to homogeneously intergrow the MOF into a polycrystalline film. Single gas permeation experiments reveal exceptional ideal selectivity of α<sub>ideal</sub>(H<sub>2</sub>/CH<sub>4</sub>) = 122 and α<sub>ideal</sub>(He/CH<sub>4</sub>) = 87. In mixed gas permeation, the separation selectivity surpasses α<sub>ideal</sub>(He/CH<sub>4</sub>) = 207 GPU. Mixed-gas tests at realistic 4:96 He/CH<sub>4</sub> feed gas composition reached a selectivity of α(He/CH<sub>4</sub>) = 31.9 and permeance for He of P(He) = 227 GPU despite the low chemical potential. Electron microscopy uncovered a complex, grain-boundary microstructure, which limits perfect molecular sieving but still enables superior separation performance. This work demonstrates that dense MOFs, at the example of MIL-116(Ga) enables high performance He-upgrading, setting a new benchmark amongst reported MOF-based membranes. We highlight the potential of dense MOFs for the separations of small, non-adsorptive gases and the need to address grain boundary diffusion in polycrystalline MOF membranes.</p>

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Synthesis and helium separation performance of polycrystalline membranes of the high precision molecular sieve MIL-116(Ga)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Ayisha Komal,
  • Laura Calderón Rodríguez,
  • Franziska Scheffler,
  • Eren Grossmann,
  • Roman Sajzew,
  • Ralf Wyrwa,
  • Thomas Hoyer,
  • Felix H. Schacher,
  • Alexander Knebel

摘要

Helium is a finite but essential resource with important applications in medicine, research, and aerospace. Conventional He-upgrading from natural methane gas (CH4) is done by cryogenic distillation. This study presents energy-efficient He-upgrading by membrane separation using the “dense” metal-organic framework (MOF) MIL-116(Ga), which enables high precision molecular sieving of non-adsorptive gases. MIL-116(Ga) membranes were synthesized on alumina disks after developing a method to homogeneously intergrow the MOF into a polycrystalline film. Single gas permeation experiments reveal exceptional ideal selectivity of αideal(H2/CH4) = 122 and αideal(He/CH4) = 87. In mixed gas permeation, the separation selectivity surpasses αideal(He/CH4) = 207 GPU. Mixed-gas tests at realistic 4:96 He/CH4 feed gas composition reached a selectivity of α(He/CH4) = 31.9 and permeance for He of P(He) = 227 GPU despite the low chemical potential. Electron microscopy uncovered a complex, grain-boundary microstructure, which limits perfect molecular sieving but still enables superior separation performance. This work demonstrates that dense MOFs, at the example of MIL-116(Ga) enables high performance He-upgrading, setting a new benchmark amongst reported MOF-based membranes. We highlight the potential of dense MOFs for the separations of small, non-adsorptive gases and the need to address grain boundary diffusion in polycrystalline MOF membranes.