沸石
钼
材料科学
吸附
扫描透射电子显微镜
丝光沸石
ZSM-5型
催化作用
分子
铝
微型多孔材料
透射电子显微镜
纳米技术
化学工程
化学
物理化学
有机化学
冶金
复合材料
工程类
作者
Lingmei Liu,Ning Wang,Chongzhi Zhu,Xiaona Liu,Yihan Zhu,Peng Guo,Lujain Alfilfil,Xinglong Dong,Daliang Zhang,Yu Han
标识
DOI:10.1002/anie.201909834
摘要
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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