| Title: | Direct Imaging of Atomically Dispersed Molybdenum that Enables Location of Aluminum in the Framework of Zeolite ZSM-5 |
| Author(s): | Liu L; Wang N; Zhu C; Liu X; Zhu Y; Guo P; Alfilfil L; Dong X; Zhang D; Han Y; |
| Address: | "King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, 23955-6900, Saudi Arabia. Department of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China. National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China. University of Chinese Academy of Sciences, Beijing, 100049, China. Multi-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies & School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China" |
| ISSN/ISBN: | 1521-3773 (Electronic) 1433-7851 (Linking) |
| 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" |
| Keywords: | electron microscopy heterogeneous catalysis host-guest systems zeolites; |
| Notes: | "PubMed-not-MEDLINELiu, Lingmei Wang, Ning Zhu, Chongzhi Liu, Xiaona Zhu, Yihan Guo, Peng Alfilfil, Lujain Dong, Xinglong Zhang, Daliang Han, Yu eng FCC/1/1972-19/King Abdullah University of Science and Technology/ 21771161/National Natural Science Foundation of China/ 02200052020013/Fundamental Research Funds for the Central Universities/ Germany 2019/11/07 Angew Chem Int Ed Engl. 2020 Jan 7; 59(2):819-825. doi: 10.1002/anie.201909834. Epub 2019 Dec 2" |
