Visualization of hierarchically structured zeolite bodies from macro to nano length scales
Visualization of hierarchically structured zeolite bodies from macro to nano length scales
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DOI：
10.1038/nchem.1403
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发表时间：
2012-10-01
期刊：
影响因子：
21.8
通讯作者：
Perez-Ramirez, Javier
中科院分区：
文献类型：
--
作者：
Mitchell, Sharon;Michels, Nina-Luisa;Perez-Ramirez, Javier
实施实验室设计的催化剂的一个主要挑战是将其扩大到技术相关的形式。先进的表征对于理解和优化工业反应器中催化剂的组装和功能至关重要。本文介绍了一种集成的方法来可视化毫米级mfi型沸石的挤出物和颗粒，显示微孔（0.56 nm），晶内介孔（类似于10 nm）和大孔（类似于200-300 nm）的三峰网络。作为甲醇转化为烯烃的例子，与传统的类似物相比，分级沸石产生了优越的性能。专门的标本制备与最先进的光学，x射线和基于电子的显微镜和层析技术相结合，证明了一种强大的方法，可以揭示整个长度范围内结构组织的其他不可访问的信息。预计这些工具将在催化剂开发的放大原则合理化方面发挥关键作用。
A major challenge in the implementation of laboratory-designed catalysts is the scale-up into technically relevant forms. Advanced characterization is essential to understand and optimize catalyst assembly and function in industrial reactors. This Article presents an integrated approach to visualizing millimetre-sized extrudates and granules of a hierarchical MFI-type zeolite, displaying trimodal networks of micropores (0.56 nm), intracrystalline mesopores (similar to 10 nm) and macropores (similar to 200-300 nm). As exemplified for the conversion of methanol to olefins, the hierarchical zeolite yields a superior performance compared to its conventional analogue. The combination of dedicated specimen preparation with state-of-the-art optical, X-ray and electron-based microscopic and tomographic techniques proves a powerful methodology to reveal otherwise inaccessible information regarding structural organization over the whole range of length scales. It is expected that these tools will play a crucial role in the rationalization of scale-up principles in catalyst development.