Schmidt Joel E, Hendriks Frank C, Lutz Martin, Post L Christiaan, Fu Donglong, Weckhuysen Bert M
Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.
Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands.
Chemphyschem. 2018 Feb 19;19(4):367-372. doi: 10.1002/cphc.201700583. Epub 2017 Aug 15.
Large crystals of zeolite ferrierite (FER) are important model systems for spatially resolved catalysis and diffusion studies, though there is considerable variation in crystal habit depending on the chemical composition and employed synthesis conditions. A synergistic combination of techniques has been applied, including single crystal X-ray diffraction, high-temperature in situ confocal fluorescence microscopy, fluorescent probe molecules, wide-field microscopy and atomic force microscopy to unravel the internal architecture of three distinct FER zeolites. Pyrolyzed template species can be used as markers for the 8-membered ring direction as they are trapped in the terraced roof of the FER crystals. This happens as the materials grow in a layer-by-layer, defect-free manner normal to the large crystal surface, and leads to a facile method to diagnose the pore system orientation, which avoids tedious single crystal X-ray diffraction experiments.
尽管根据化学成分和所采用的合成条件，沸石镁碱沸石（FER）的晶体习性存在相当大的差异，但大晶体的沸石镁碱沸石（FER）是用于空间分辨催化和扩散研究的重要模型体系。已应用了多种技术的协同组合，包括单晶X射线衍射、高温原位共聚焦荧光显微镜、荧光探针分子、宽场显微镜和原子力显微镜，以揭示三种不同FER沸石的内部结构。热解的模板物种可作为八元环方向的标记，因为它们被困在FER晶体的阶梯状顶部。这种情况发生在材料以垂直于大晶体表面的逐层、无缺陷方式生长时，从而产生了一种诊断孔系统取向的简便方法，避免了繁琐的单晶X射线衍射实验。
