Preparation and properties of layered silica and layered alumino-silica hydrate from natural apophyllite

Yu Sogo, Fumiaki Iizuka, Atsushi Yamazaki

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    Abstract

    Crystalline layered silica hydrates were prepared from a natural apophyllite pretreated with 0.1 mol·dm -3 hydrochloric acid at 5° or 25°C. In these treatments, a product with higher crystallinity was obtained by acidic treatment at a lower temperature. The two silica hydrates had the different local silica structure, and were found to correspond to the silicas reported as an H-apophyllite and a Silica-AP, respectively. The silica hydrates have a fundamental silica sheet structure of apophyllite, and the structure is destroyed by heating above 200°C due to condensation of silanol groups in the interlayer spaces. On the other hand, a crystalline layered alumino-silica hydrate was also obtained from a natural apophyllite pretreated with an aluminum chloride solution. Formation of four different hydrate phases depended mainly upon pH of the reacting solution and/or temperature in the drying process. The introduced aluminum ion was coordinated tetrahedrally and occupied mainly at the interlayer of the silica sheets. On heating, these alumino-silicates maintained their crystal structures up to ca. 400°C. These results suggested that the introduced aluminum ion should prevent the basal silica sheet distance from narrowing and the silanol groups from condensing. In consequence, the sheet structure of these alumino-silicates were more stabilized thermally than that of the silica hydrate.

    Original languageEnglish
    Pages (from-to)160-168
    Number of pages9
    JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
    Volume106
    Issue number2
    Publication statusPublished - 1998

    Fingerprint

    Silicic Acid
    Hydrates
    Silicon Dioxide
    hydrates
    Silica
    silicon dioxide
    preparation
    Silicates
    Aluminum
    Ions
    Crystalline materials
    Heating
    Hydrochloric Acid
    interlayers
    silicates
    Condensation
    Drying
    Crystal structure
    aluminum
    aluminum chlorides

    Keywords

    • Layered alumino-silica hydrate
    • Layered silica hydrate
    • Phase change

    ASJC Scopus subject areas

    • Ceramics and Composites

    Cite this

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    abstract = "Crystalline layered silica hydrates were prepared from a natural apophyllite pretreated with 0.1 mol·dm -3 hydrochloric acid at 5° or 25°C. In these treatments, a product with higher crystallinity was obtained by acidic treatment at a lower temperature. The two silica hydrates had the different local silica structure, and were found to correspond to the silicas reported as an H-apophyllite and a Silica-AP, respectively. The silica hydrates have a fundamental silica sheet structure of apophyllite, and the structure is destroyed by heating above 200°C due to condensation of silanol groups in the interlayer spaces. On the other hand, a crystalline layered alumino-silica hydrate was also obtained from a natural apophyllite pretreated with an aluminum chloride solution. Formation of four different hydrate phases depended mainly upon pH of the reacting solution and/or temperature in the drying process. The introduced aluminum ion was coordinated tetrahedrally and occupied mainly at the interlayer of the silica sheets. On heating, these alumino-silicates maintained their crystal structures up to ca. 400°C. These results suggested that the introduced aluminum ion should prevent the basal silica sheet distance from narrowing and the silanol groups from condensing. In consequence, the sheet structure of these alumino-silicates were more stabilized thermally than that of the silica hydrate.",
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    author = "Yu Sogo and Fumiaki Iizuka and Atsushi Yamazaki",
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    T1 - Preparation and properties of layered silica and layered alumino-silica hydrate from natural apophyllite

    AU - Sogo, Yu

    AU - Iizuka, Fumiaki

    AU - Yamazaki, Atsushi

    PY - 1998

    Y1 - 1998

    N2 - Crystalline layered silica hydrates were prepared from a natural apophyllite pretreated with 0.1 mol·dm -3 hydrochloric acid at 5° or 25°C. In these treatments, a product with higher crystallinity was obtained by acidic treatment at a lower temperature. The two silica hydrates had the different local silica structure, and were found to correspond to the silicas reported as an H-apophyllite and a Silica-AP, respectively. The silica hydrates have a fundamental silica sheet structure of apophyllite, and the structure is destroyed by heating above 200°C due to condensation of silanol groups in the interlayer spaces. On the other hand, a crystalline layered alumino-silica hydrate was also obtained from a natural apophyllite pretreated with an aluminum chloride solution. Formation of four different hydrate phases depended mainly upon pH of the reacting solution and/or temperature in the drying process. The introduced aluminum ion was coordinated tetrahedrally and occupied mainly at the interlayer of the silica sheets. On heating, these alumino-silicates maintained their crystal structures up to ca. 400°C. These results suggested that the introduced aluminum ion should prevent the basal silica sheet distance from narrowing and the silanol groups from condensing. In consequence, the sheet structure of these alumino-silicates were more stabilized thermally than that of the silica hydrate.

    AB - Crystalline layered silica hydrates were prepared from a natural apophyllite pretreated with 0.1 mol·dm -3 hydrochloric acid at 5° or 25°C. In these treatments, a product with higher crystallinity was obtained by acidic treatment at a lower temperature. The two silica hydrates had the different local silica structure, and were found to correspond to the silicas reported as an H-apophyllite and a Silica-AP, respectively. The silica hydrates have a fundamental silica sheet structure of apophyllite, and the structure is destroyed by heating above 200°C due to condensation of silanol groups in the interlayer spaces. On the other hand, a crystalline layered alumino-silica hydrate was also obtained from a natural apophyllite pretreated with an aluminum chloride solution. Formation of four different hydrate phases depended mainly upon pH of the reacting solution and/or temperature in the drying process. The introduced aluminum ion was coordinated tetrahedrally and occupied mainly at the interlayer of the silica sheets. On heating, these alumino-silicates maintained their crystal structures up to ca. 400°C. These results suggested that the introduced aluminum ion should prevent the basal silica sheet distance from narrowing and the silanol groups from condensing. In consequence, the sheet structure of these alumino-silicates were more stabilized thermally than that of the silica hydrate.

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