Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites

Masaru Ogura, Shin Ya Shinomiya, Junko Tateno, Yasuto Nara, Mikihiro Nomura, Eiichi Kikuchi, Masahiko Matsukata

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    ZSM-5 zeolite having a SiO2/Al2O3 molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores.

    Original languageEnglish
    Pages (from-to)33-43
    Number of pages11
    JournalApplied Catalysis A: General
    Issue number1-2
    Publication statusPublished - 2001 Oct 5



    • Acidity
    • Alkali-treatment
    • Mesopore
    • ZSM-5

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology

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