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Fast Gas-Adsorption Kinetics in Supraparticle-Based MOF Packings with Hierarchical Porosity.

Atsushi Fujiwara1, Junwei Wang2, Shotaro Hiraide1

  • 1Department of Chemical Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.

Advanced Materials (Deerfield Beach, Fla.)
|September 15, 2023
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Summary

Creating hierarchical metal-organic frameworks (MOFs) using supraparticles significantly enhances gas adsorption. This structural approach overcomes mass-transport limitations in compacted MOF pellets, boosting performance.

Keywords:
adsorption kineticshierarchical porositymetal-organic frameworksself-assemblysupraparticles

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are effective microporous adsorbents for gas separation.
  • Nanoparticle MOFs have unique adsorption properties compared to bulk crystals.
  • Compacting MOFs into pellets for applications creates mass-transport limitations.

Purpose of the Study:

  • To address mass-transport limitations in compacted MOF materials.
  • To develop a hierarchical material structure using a supraparticle-based approach.
  • To enhance gas-adsorption kinetics in MOF pellets.

Main Methods:

  • Fabrication of spherical supraparticles composed of nanosized MOF particles via emulsion templating.
  • Use of Zeolitic Imidazolate Framework-8 (ZIF-8) as a model system.
  • Comparison of gas-adsorption kinetics between hierarchical and conventional ZIF-8 pellets.

Main Results:

  • A pellet packed with supraparticles demonstrated a 30-fold increase in adsorption rate compared to unstructured ZIF-8 powder pellets.
  • Hierarchical MOFs exhibit efficient mass transport due to interconnected pores.
  • The combination of macropores and micropores enhances surface area and adsorption sites.

Conclusions:

  • Controlling structural hierarchy is crucial for maximizing MOF material performance.
  • The supraparticle approach effectively overcomes mass-transport limitations in MOF pellets.
  • Hierarchical MOFs offer a promising strategy for high-throughput gas separation applications.