Zhang Qing, Mayoral Alvaro, Li Junyan, Ruan Juanfang, Alfredsson Viveka, Ma Yanhang, Yu Jihong, Terasaki Osamu
Center for High-Resolution Electron Microscopy (CħEM), School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai, 201210, China.
Institute of Nanoscience and Materials of Aragon (INMA), CSIC-University of Zaragoza, 12, Calle de Pedro Cerbuna, 50009, Zaragoza, Spain.
Angew Chem Int Ed Engl. 2020 Oct 26;59(44):19403-19413. doi: 10.1002/anie.202007490. Epub 2020 Aug 7.
Zeolites are widely used in catalysis, gas separation, ion exchange, etc. due to their superior physicochemical properties, which are closely related to specific features of their framework structures. Although more than two hundred different framework types have been recognized, it is of great interest to explore from a crystallographic perspective, the atomic positions, surface terminations, pore connectivity and structural defects that deviate from the ideal framework structures, namely local structural modulation. In this article, we review different types of local modulations in zeolite frameworks using various techniques, especially electron microscopy (EM). The most recent advances in resolving structural information at the atomic level with aberration corrected EM are also presented, commencing a new era of gaining atomic structural information, not only for all tetrahedral atoms including point vacancies in framework but also for extra-framework cations and surface terminations.
沸石因其优异的物理化学性质而广泛应用于催化、气体分离、离子交换等领域，这些性质与它们骨架结构的特定特征密切相关。尽管已经识别出两百多种不同的骨架类型，但从晶体学角度探索偏离理想骨架结构的原子位置、表面终止、孔连通性和结构缺陷，即局部结构调制，仍具有极大的研究价值。在本文中，我们综述了使用各种技术，特别是电子显微镜（EM）对沸石骨架中不同类型的局部调制。还介绍了利用像差校正电子显微镜在原子水平解析结构信息方面的最新进展，开启了一个获取原子结构信息的新时代，不仅适用于包括骨架中点空位在内的所有四面体原子，也适用于骨架外阳离子和表面终止。
