Silylation of layered silicate RUB-51 with SiCl4 and conversion of the silylated derivative to a crystalline microporous material

Yusuke Asakura, Yasuhiro Sakamoto, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    A novel crystalline microporous material is synthesized by silylation of layered silicate RUB-51 with tetrachlorosilane (SiCl4), hydrolysis, and heat treatment for interlayer condensation. One SiCl4 molecule first undergoes ordered silylation with two confronting groups, Si-O- and Si-OH, on the interlayer surfaces of RUB-51 (bidentate silylation). Hydrolysis of the unreacted Si-Cl groups of the immobilized silyl groups by a mixture of H2O and dimethyl sulfoxide (DMSO) affords geminal Si-OH groups on the surfaces without simultaneous interlayer condensation because of intercalation with DMSO. Subsequent heat treatment leads to condensation between neighboring layers, and the condensed material is composed of layers of RUB-51 displaced by a half-unit cell along the a axis. Hydroxyl groups are present after interlayer cross-linking, which is one of the unique features of the method using SiCl4. The obtained sample adsorbs CO2 molecules, while RUB-51 itself without silylation cannot. The amount of adsorbed CO2 on the microporous material is larger than that of CH 4, suggesting the potential of this material as a separation medium between CO2 and CH4. This study indicates that the preparation of microporous materials, using layered silicates as a building block and various silylating agents, is useful for precise design of both porosity and functional groups on pore surfaces, which drastically affect the properties of crystalline microporous materials, including catalytic selectivity and separation capability.

    Original languageEnglish
    Pages (from-to)3796-3803
    Number of pages8
    JournalChemistry of Materials
    Volume26
    Issue number12
    DOIs
    Publication statusPublished - 2014 Jun 24

    Fingerprint

    Microporous materials
    Silicates
    Crystalline materials
    Derivatives
    Condensation
    Dimethyl sulfoxide
    Dimethyl Sulfoxide
    Hydrolysis
    Heat treatment
    Molecules
    Intercalation
    Hydroxyl Radical
    Functional groups
    Porosity

    ASJC Scopus subject areas

    • Materials Chemistry
    • Chemical Engineering(all)
    • Chemistry(all)

    Cite this

    Silylation of layered silicate RUB-51 with SiCl4 and conversion of the silylated derivative to a crystalline microporous material. / Asakura, Yusuke; Sakamoto, Yasuhiro; Kuroda, Kazuyuki.

    In: Chemistry of Materials, Vol. 26, No. 12, 24.06.2014, p. 3796-3803.

    Research output: Contribution to journalArticle

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