Direct Atomic-Level Imaging of Zeolites : Oxygen, Sodium in Na-LTA and Iron in Fe-MFI

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Alvaro Mayoral
  • Qing Zhang
  • Yi Zhou
  • Pengyu Chen
  • Yanhang Ma
  • Taro Monji
  • Pit Losch
  • Wolfgang Schmidt
  • Ferdi Schüth
  • Jihong Yu
  • Osamu Terasaki

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)19678-19685
Journal / PublicationAngewandte Chemie
Volume132
Issue number44
Online published16 Jun 2020
Publication statusPublished - 26 Oct 2020

Link(s)

Abstract

Zeolites are becoming more versatile in their chemical functions through rational design of their frameworks. Therefore, direct imaging of all atoms at the atomic scale, basic units (Si, Al, and O), heteroatoms in the framework, and extra-framework cations, is needed. TEM provides local information at the atomic level, but the serious problem of electron-beam damage needs to be overcome. Herein, all framework atoms, including oxygen and most of the extra-framework Na cations, are successfully observed in one of the most electron-beam-sensitive and lowest framework density zeolites, Na-LTA. Zeolite performance, for instance in catalysis, is highly dependent on the location of incorporated heteroatoms. Fe single atomic sites in the MFI framework have been imaged for the first time. The approach presented here, combining image analysis, electron diffraction, and DFT calculations, can provide essential structural keys for tuning catalytically active sites at the atomic level.

Research Area(s)

  • annular bright-field analysis, beam damage, electron diffraction, electron microscopy, Zeolites

Citation Format(s)

Direct Atomic-Level Imaging of Zeolites: Oxygen, Sodium in Na-LTA and Iron in Fe-MFI. / Mayoral, Alvaro; Zhang, Qing; Zhou, Yi et al.
In: Angewandte Chemie, Vol. 132, No. 44, 26.10.2020, p. 19678-19685.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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