Two-stage crystallization of meso-and macroporous MFI and MEL zeolites using tributylamine-derived diquaternary ammonium cations as organic structure-directing agents

Sye Hoe Keoh, Watcharop Chaikittisilp, Akira Endo, Atsushi Shimojima, Tatsuya Okubo

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Nanoporous materials have been utilized in a wide range of applications, e.g., adsorption, catalysis, energy storage, and drug delivery. Meso- and macroporous MFI and MEL aluminosilicate zeolites were synthesized via a two-stage crystallization method using diquaternary ammonium cations (N,N,N,N',N',N"-hexabutylheptanediammonium, Bu6-diquat-7) as an organic structure-directing agent. In this two-stage process, both low- and high-temperature stages were found to be crucial for the formation of zeolites. Bu6-diquat-7 was more selective to the formation of MFI and MEL zeolites than its monoquaternary counterpart under the present synthesis conditions. Interestingly, the synthesis time of the first (low temperature) stage highly affected the particle sizes of the resulting zeolites, wherein zeolites with smaller sizes were obtained under prolonged synthesis time. Gas physisorption analyses and scanning transmission electron microscopy observation indicated that the obtained zeolites possessed ink-bottle-like pores consisting of meso- and macroporous internal cavities with very narrow pore necks.

    Original languageEnglish
    Pages (from-to)586-594
    Number of pages9
    JournalBulletin of the Chemical Society of Japan
    Volume90
    Issue number5
    DOIs
    Publication statusPublished - 2017

    Fingerprint

    Zeolites
    Crystallization
    Ammonium Compounds
    Cations
    Diquat
    Physisorption
    Bottles
    Drug delivery
    Ink
    Temperature
    Energy storage
    Catalysis
    tributylamine
    Gases
    Particle size
    Transmission electron microscopy
    Adsorption
    Scanning electron microscopy

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Two-stage crystallization of meso-and macroporous MFI and MEL zeolites using tributylamine-derived diquaternary ammonium cations as organic structure-directing agents. / Keoh, Sye Hoe; Chaikittisilp, Watcharop; Endo, Akira; Shimojima, Atsushi; Okubo, Tatsuya.

    In: Bulletin of the Chemical Society of Japan, Vol. 90, No. 5, 2017, p. 586-594.

    Research output: Contribution to journalArticle

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    abstract = "Nanoporous materials have been utilized in a wide range of applications, e.g., adsorption, catalysis, energy storage, and drug delivery. Meso- and macroporous MFI and MEL aluminosilicate zeolites were synthesized via a two-stage crystallization method using diquaternary ammonium cations (N,N,N,N',N',N{"}-hexabutylheptanediammonium, Bu6-diquat-7) as an organic structure-directing agent. In this two-stage process, both low- and high-temperature stages were found to be crucial for the formation of zeolites. Bu6-diquat-7 was more selective to the formation of MFI and MEL zeolites than its monoquaternary counterpart under the present synthesis conditions. Interestingly, the synthesis time of the first (low temperature) stage highly affected the particle sizes of the resulting zeolites, wherein zeolites with smaller sizes were obtained under prolonged synthesis time. Gas physisorption analyses and scanning transmission electron microscopy observation indicated that the obtained zeolites possessed ink-bottle-like pores consisting of meso- and macroporous internal cavities with very narrow pore necks.",
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