TY - JOUR
T1 - Direct Imaging of Atomically Dispersed Molybdenum that Enables Location of Aluminum in the Framework of Zeolite ZSM-5
AU - Liu, Lingmei
AU - Wang, Ning
AU - Zhu, Chongzhi
AU - Liu, Xiaona
AU - Zhu, Yihan
AU - Guo, Peng
AU - Alfilfil, Lujain
AU - Dong, Xinglong
AU - Zhang, Daliang
AU - Han, Yu
N1 - Funding Information:
This research was supported by CCF grant (FCC/1/1972-19) to Y.H. from King Abdullah University of Science and Technology (KAUST). This research used the resources of KAUST's Core Labs facilities. Y.Z. acknowledges financial support from National Natural Science Foundation of China (21771161) and the Thousand Talents Program for Distinguished Young Scholars. D.Z. acknowledges financial support from Fundamental Research Funds for the Central Universities (02200052020013).
Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/1/7
Y1 - 2020/1/7
N2 - 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.
AB - 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.
KW - electron microscopy
KW - heterogeneous catalysis
KW - host–guest systems
KW - zeolites
UR - http://www.scopus.com/inward/record.url?scp=85076103131&partnerID=8YFLogxK
U2 - 10.1002/anie.201909834
DO - 10.1002/anie.201909834
M3 - Article
C2 - 31688992
AN - SCOPUS:85076103131
SN - 1433-7851
VL - 59
SP - 819
EP - 825
JO - Angewandte Chemie International Edition in English
JF - Angewandte Chemie International Edition in English
IS - 2
ER -