Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.
J Am Chem Soc. 2011 Aug 17;133(32):12390-3. doi: 10.1021/ja2046815. Epub 2011 Jul 25.
Zeolites are microporous materials with pores and channels of molecular dimensions that find numerous applications in catalysis, separations, ion exchange, etc. However, whereas uniformity of micropore size is a most desirable and enabling characteristic for many of their uses, in certain cases, for example in reactions involving bulky molecules, it is a limitation. For this reason, synthesis of hierarchical zeolites with micro- and mesoporosity is of considerable interest as a way to control molecular traffic for improved catalytic and separation performance. Herein, we report a general synthesis route for the confined synthesis of zeolites within three-dimensionally ordered mesoporous carbon templates by conventional hydrothermal synthesis. Various zeolites, including BEA, LTA, FAU, and LTL, with three-dimensionally ordered mesoporous-imprinted structure have been synthesized by this approach. It is expected that these hierarchical zeolite materials will provide building blocks for thin-film and other syntheses and may provide a basis for quantitatively studying the mass-transfer limitation on the catalytic performance of zeolite catalysts.
沸石是具有微孔和通道的微孔材料，其分子尺寸在催化、分离、离子交换等方面有广泛的应用。然而，尽管微孔大小的均匀性是许多应用所期望和必需的特性，但在某些情况下，例如在涉及大体积分子的反应中，这是一个限制。因此，具有微孔和介孔的分级沸石的合成作为一种控制分子流量以提高催化和分离性能的方法，具有相当大的意义。本文报道了一种通过常规水热合成在三维有序介孔碳模板中限制合成沸石的通用方法。通过该方法合成了各种沸石，包括 BEA、LTA、FAU 和 LTL，具有三维有序介孔印迹结构。预计这些分级沸石材料将为薄膜和其他合成提供构建块，并可能为定量研究沸石催化剂的催化性能的传质限制提供基础。
