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Zeolites are highly efficient industrial catalysts and sorbents with microporous
framework structures. Approximately 10% of the frameworks, but eventually
all in the long run, have produced both 3D crystals and 2D layers. The latter
can be intercalated and expanded like all 2D materials but proved difficult to
exfoliate directly into suspensions of monolayers in solution as precursors for
unique synthetic opportunities. Successful exfoliations have been reported
recently and are overviewed in this perspective article. The discussion
highlights 3 primary challenges in this field, namely finding suitable 2D zeolite
preparations that exfoliate directly in high yield, proving uniform layer
thickness in solution and identifying applications to exploit the unique
synthetic capabilities and properties of exfoliated zeolite monolayers. Four
zeolites have been confirmed to exfoliate directly into monolayers: 3 with
known structures—MWW, MFI, and RWR and one unknown, bifer with a unit
cell close to ferrierite. The exfoliation into monolayers is confirmed by the
combination of 5–6 characterization techniques including AFM, in situ and
in-plane XRD, and microscopies. The promising areas of development are
oriented films and membranes, intimately mixed zeolite phases, and
hierarchical nanoscale composites with other active species like nanoparticles
and clusters that are unfeasible by solid state processes.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: bifer, chemical exfoliation, ilerite, nanocomposites, ultrathin zeolite nanosheets, zeolite films, zeolites MFI and MWW

刊行年月日: 2023-11-28

出版者: Wiley-Blackwell

掲載誌:

• ADVANCED MATERIALS (ISSN: 15214095) vol. 36 issue. 4

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adma.202307341

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更新時刻: 2024-07-09 12:30:33 +0900

MDRでの公開時刻: 2024-07-09 12:30:33 +0900