Synthesis of thermally stable and 2-D hexagonal super-microporous silica from hydrated α-sodium disilicate

Munetaka Kato, Tetsuro Shigeno, Tatsuo Kimura, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    31 Citations (Scopus)

    Abstract

    Thermally stable and 2-D hexagonal super-microporous silicas were obtained utilizing hydrated α-sodium disilicate over a diverse range of surfactant/Si molar ratios. Silica-based mesostructured materials composed of hydrated α-sodium disilicate and hexadecyltrimethylammonium (C 16TMA) cations were acid-treated, resulting in the formation of 2-D hexagonal mesostructured silica(α)-n (n = C16TMA/Si molar ratio). Although the 2-D hexagonal structure of mesostructured silica(α)-0.2 collapsed at 900°C, those of mesostructured silicas(α)-0.5, -0.7, and -1.0 were retained even after calcination at 1000°C. The retention of the 2-D hexagonal structures was confirmed further by TEM. The higher thermal stability is ascribed to lower Na content in mesostructured silica(α)-n. Higher C16TMA/Si molar ratios lowered the pH values in the reaction suspensions, and then interlayer Na ions in the silicates were further exchanged with hydrated protons. Because of the higher thermal stability, ordered super-microporous silicas can be formed in the present system. The condensation of the silicate frameworks proceeded with the rise of the calcination temperature, leading to a further decrease in pore size. The pore sizes of the products calcined at 1000°C were 1.7-1.8 nm (BJH method), smaller than those reported for ordered mesoporous silicas prepared using C16TMA cations.

    Original languageEnglish
    Pages (from-to)6416-6421
    Number of pages6
    JournalChemistry of Materials
    Volume17
    Issue number25
    DOIs
    Publication statusPublished - 2005 Dec 13

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    Silicon Dioxide
    Sodium
    Silica
    Silicates
    Calcination
    Pore size
    Cations
    Thermodynamic stability
    Positive ions
    Surface-Active Agents
    Protons
    Condensation
    Suspensions
    Surface active agents
    Ions
    Transmission electron microscopy
    Acids

    ASJC Scopus subject areas

    • Materials Chemistry
    • Materials Science(all)

    Cite this

    Synthesis of thermally stable and 2-D hexagonal super-microporous silica from hydrated α-sodium disilicate. / Kato, Munetaka; Shigeno, Tetsuro; Kimura, Tatsuo; Kuroda, Kazuyuki.

    In: Chemistry of Materials, Vol. 17, No. 25, 13.12.2005, p. 6416-6421.

    Research output: Contribution to journalArticle

    Kato, Munetaka ; Shigeno, Tetsuro ; Kimura, Tatsuo ; Kuroda, Kazuyuki. / Synthesis of thermally stable and 2-D hexagonal super-microporous silica from hydrated α-sodium disilicate. In: Chemistry of Materials. 2005 ; Vol. 17, No. 25. pp. 6416-6421.
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    abstract = "Thermally stable and 2-D hexagonal super-microporous silicas were obtained utilizing hydrated α-sodium disilicate over a diverse range of surfactant/Si molar ratios. Silica-based mesostructured materials composed of hydrated α-sodium disilicate and hexadecyltrimethylammonium (C 16TMA) cations were acid-treated, resulting in the formation of 2-D hexagonal mesostructured silica(α)-n (n = C16TMA/Si molar ratio). Although the 2-D hexagonal structure of mesostructured silica(α)-0.2 collapsed at 900°C, those of mesostructured silicas(α)-0.5, -0.7, and -1.0 were retained even after calcination at 1000°C. The retention of the 2-D hexagonal structures was confirmed further by TEM. The higher thermal stability is ascribed to lower Na content in mesostructured silica(α)-n. Higher C16TMA/Si molar ratios lowered the pH values in the reaction suspensions, and then interlayer Na ions in the silicates were further exchanged with hydrated protons. Because of the higher thermal stability, ordered super-microporous silicas can be formed in the present system. The condensation of the silicate frameworks proceeded with the rise of the calcination temperature, leading to a further decrease in pore size. The pore sizes of the products calcined at 1000°C were 1.7-1.8 nm (BJH method), smaller than those reported for ordered mesoporous silicas prepared using C16TMA cations.",
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