Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 2, Pages 819-825Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909834
Keywords
electron microscopy; heterogeneous catalysis; host-guest systems; zeolites
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Funding
- CCF grant from King Abdullah University of Science and Technology (KAUST) [FCC/1/1972-19]
- National Natural Science Foundation of China [21771161]
- Thousand Talents Program for Distinguished Young Scholars
- Fundamental Research Funds for the Central Universities [02200052020013]
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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.
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