Direct Imaging of Atomically Dispersed Molybdenum that Enables Location of Aluminum in the Framework of Zeolite ZSM-5

Lingmei Liu, Ning Wang, Chongzhi Zhu, Xiaona Liu, Yihan Zhu, Peng Guo, Lujain Alfilfil, Xinglong Dong, Daliang Zhang, Yu Han*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

126 Scopus citations

Abstract

Integrated differential phase-contrast scanning transmission electron microscopy (iDPC-STEM) is capable of directly probing guest molecules in zeolites, owing to its sufficient and interpretable image contrast for both heavy and light elements under low-dose conditions. This unique ability is demonstrated by imaging volatile organic compounds adsorbed in zeolite Silicalite-1; iDPC-STEM was then used to investigate molybdenum supported on various zeolites including Silicalite-1, ZSM-5, and mordenite. Isolated single-Mo clusters were observed in the micropores of ZSM-5, demonstrating the crucial role of framework Al in driving Mo atomically dispersed into the micropores. Importantly, the specific one-to-one Mo-Al interaction makes it possible to locate Al atoms, that is, catalytic active sites, in the ZSM-5 framework from the images, according to the positions of Mo atoms in the micropores.

Original languageEnglish (US)
Pages (from-to)819-825
Number of pages7
JournalAngewandte Chemie - International Edition
Volume59
Issue number2
DOIs
StatePublished - Jan 7 2020

Bibliographical note

Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • electron microscopy
  • heterogeneous catalysis
  • host–guest systems
  • zeolites

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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