Synthesis of Mesoporous Zeolites and the Future Prospects for Controlling the Porous Structure

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  • Matsuno Takamichi
    Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology, Waseda University
  • Takaoka Kohei
    Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University
  • Kuroda Kazuyuki
    Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology, Waseda University
  • Shimojima Atsushi
    Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology, Waseda University

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Other Title
  • メソポーラスゼオライト合成研究における細孔構造制御の展望
  • メソポーラスゼオライト ゴウセイ ケンキュウ ニ オケル サイコウ コウゾウ セイギョ ノ テンボウ

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Abstract

In this paper, we focus on the conventional synthesis methods of mesoporous zeolites with precisely controlled nanopore structures, and the recent development and challenges are introduced. Then, our new synthetic method using a nanoporous metal oxide as a template is presented. The precise control of mesopore structures of zeolites is crucial to improve the catalytic performances. The importance of nanostructures has also been demonstrated very recently in zeolite–metal oxide mixed catalysts. Previous studies have shown that nanoporous carbon templates are useful for the control of pore size and structural regularity of mesoporous zeolites. However, hydrothermal synthesis of zeolites using hydrophobic carbon templates is often plagued by the zeolite formation outside the template. We attempted to solve this problem by using a relatively hydrophilic metal oxide as a template. When nanoporous cobalt oxide was used as a template, silicalite-1 was preferentially grown inside the template by the hydrothermal synthesis, giving ordered mesoporous zeolite by the template removal. In contrast, when carbon was used as a template, external precipitation and the formation of small nanoparticles occurred under the same conditions.

Journal

  • ゼオライト

    ゼオライト 40 (3), 103-108, 2023-07-15

    Japan Association of Zeolite

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