Advanced Aberration-corrected STEM Techniques for Atomic Imaging of Zeolites-confined Single Molecules:From Exsituto Insitu  

作　　者：WANG Guowei XIONG Hao WEI Fei CHEN Xiao 

机构地区：[1]Ordos Laboratory,Ordos 017000,P.R.China [2]Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,P.R.China

出　　处：《Chemical Research in Chinese Universities》2025年第2期196-210,共15页高等学校化学研究(英文版)

基　　金：supported by the National Key Research and Development Program of China(Nos.2020YFB0606401 and 2018YFB0604801);the National Natural Science Foundation of China(Nos.22238004,22275110,22322203,223B2205);the Tsinghua-Toyota Joint Research Fund,the National Postdoctoral Program for Innovative Talent and Shuimu Scholar from Tsinghua University,and the Key Research and Development Program of Inner Mongolia and Ordos,China.

摘　　要：Zeolites are a class of inorganic microporous crystalline materials with ordered pore channels, unique shape selectivity, adjustable acidity and alkalinity, and high stability and have been widely used in gas adsorption and heterogeneous catalysis. The size of the zeolite pore structure determines its molecular sieving properties. Therefore, flexibly adjusting the zeolite pore structure and the host-guest interactions with guest molecules to control diffusion or reaction pathways is crucial for designing novel zeolites. Observing the real movement behavior of small molecules and changes in the local structure of the zeolite framework at the micro-nano scale is of great significance. Recently, emerging scanning transmission electron microscopy (STEM) imaging techniques, such as integrated differential phase contrast/optimum bright-field STEM (iDPC/OBF-STEM) and 4D-STEM ptychography have shown great potential for atomic resolution characterization of zeolites, since these are greatly advantageous for imaging electron beam-sensitive materials and light elements. This review first introduces the structural characteristics and applications of zeolites. Secondly, we discuss the application of three emerging imaging techniques in atomic imaging of zeolites. Thirdly, we focus on using iDPC-STEM imaging technology to observe the host-guest interactions between zeolites and single molecules (e.g., benzene, p-xylene, and pyridine). Furthermore, we explore the adsorption-desorption behavior of single molecules in zeolites using in situ iDPC-STEM imaging technology. Finally, we discuss the current challenges and future prospects of advanced TEM characterization techniques in the imaging of zeolite-confined single molecule.

关 键 词：ZEOLITE Integrated differential phase contrast/optimum bright-field STEM 4D-STEM ptychography Single-molecule imaging In situ TEM 

分 类 号：O6[理学—化学]