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Flexible Soft-Solid Metal-Organic Framework Composite Membranes for H2 /CO2 Separation.

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  • 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.

Angewandte Chemie (International Ed. in English)
|February 1, 2022
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Summary

Researchers developed flexible metal-organic framework (MOF)-based membranes for gas separation. These novel MOF membranes achieve record-breaking H₂/CO₂ selectivity, demonstrating potential for practical applications.

Keywords:
FlexibilityGas SeparationMembraneMetal-Organic FrameworksPolyamide

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Developing high-performance membranes for gas separation is crucial.
  • Metal-organic frameworks (MOFs) offer tunable porosity for molecular sieving.
  • Scalable fabrication of defect-free MOF membranes remains a challenge.

Purpose of the Study:

  • To create a facile strategy for defect-free, flexible MOF-based composite membranes.
  • To achieve high selectivity and good scalability in MOF membranes.
  • To demonstrate the application of these membranes in gas separation.

Main Methods:

  • Fabrication of soft-solid MOF composite membranes on polyvinylidene fluoride substrates.
  • Utilizing quasi-vertically grown lamellar Zn₂(Bim)₄ MOF with lateral ultrathin polyamide film.
  • Testing separation performance under mechanical stress (rolling, folding).

Main Results:

  • A representative membrane achieved a record H₂/CO₂ selectivity of 1084.
  • The composite structure with MOF galleries and polyamide defect elimination synergistically enhanced selectivity.
  • Membrane performance remained stable after repeated mechanical deformation.
  • ZIF-67 and ZIF-8 composite membranes also showed high H₂/CO₂ separation accuracy.

Conclusions:

  • The developed strategy enables the construction of high-performance, flexible MOF-based membranes.
  • The intrinsic molecular sieving capability of MOFs is demonstrated for practical separations.
  • This work promotes the advancement of MOF membranes for industrial gas separation applications.