In Situ Three-Dimensional Visualization of Guest Adsorption in MOF-74-Co Crystalline Particles

DOI Web Site
  • Matsui Hirosuke
    School of Science, Kwansei Gakuin University Graduate School of Science, Research Center for Materials Science, Nagoya University
  • Tada Mizuki
    Graduate School of Science, Research Center for Materials Science, Nagoya University RIKEN SPring-8 Center
  • Sakamoto Hirotoshi
    RIKEN SPring-8 Center Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University

Bibliographic Information

Other Title
  • MOF-74-Co結晶一粒子のゲスト吸着分布のその場3次元可視化
  • MOF-74-Co ケッショウ イチ リュウシ ノ ゲスト キュウチャク ブンプ ノ ソノ バ 3ジゲン カシカ
Published
2026-01-30
DOI
  • 10.20731/zeoraito.43.1.1
Publisher
Japan Association of Zeolite

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Description

Metal–organic frameworks (MOFs), recognized by the 2025 Nobel Prize in Chemistry, are porous crystalline materials with promising applications in adsorption, separation, and catalysis. However, adsorption behavior at the level of individual crystal particles remains insufficiently understood. In this study, we visualized the coordination adsorption process of water molecules in MOF-74-Co crystals by combining X-ray absorption fine structure (XAFS) spectroscopy with three-dimensional X-ray computed tomography (XAFS-CT) imaging. In situ 3D-XANES data obtained under controlled relative pressures for the first time revealed a heterogeneous distribution in which coordination adsorption on Co sites proceeds preferentially in the crystal core while being delayed at the edges. Furthermore, microbeam X-ray diffraction measurements demonstrated that this adsorption heterogeneity originates from local variations in crystallinity. These findings elucidate the competitive behavior between coordination and physisorption within the pores and the spatial dependence of adsorption inside the crystal, providing a new methodology for understanding the adsorption properties of MOFs.

Journal

  • ゼオライト

    ゼオライト 43 (1), 1-9, 2026-01-30

    Japan Association of Zeolite

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