Crystallization behavior of zeolite beta during steam-assited crystallization of dry gel

Masahiko Matsukata, T. Osaki, M. Ogura, E. Kikuchi

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    Abstract

    Zeolite beta with SiO2/Al2O3 ratios from 30 to 730 was synthesized by a steam-assisted crystallization method, and the crystallized products obtained within 24 h were characterized by means of chemical analyses, XRD, FE-SEM, 29Si-MAS NMR, N2 adsorption, and temperature-programmed decomposition of tetraethylammonium cation occluded in the micropores of zeolite beta. Based on these results, the crystallization mechanism is discussed herein. It was found that agglomerates of nano-particles were formed from a dry gel before the development of a periodical structure in a long-range order, which can be detected by XRD. After several hours of crystallization, morphological changes in nano-particle agglomerates proceeded to give highly crystalline zeolite beta.

    Original languageEnglish
    Pages (from-to)1-10
    Number of pages10
    JournalMicroporous and Mesoporous Materials
    Volume56
    Issue number1
    DOIs
    Publication statusPublished - 2002 Oct

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    Keywords

    • Crystallization mechanism
    • SiO/AlO ratio
    • Steam-assisted crystallization
    • Zeolite beta

    ASJC Scopus subject areas

    • Catalysis
    • Materials Science(all)

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