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Hydrothermal synthesis of gallium-substituted titanosilicate, ETGS-10

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Abstract

One of ETS-10 (Engelhard titanosilicate materials number 10) variants, ETGS-10 was successfully synthesized within limited Ga/Ti molar ratio of 0.1–0.3 using sodium silicate and titanium oxysulfate (TiOSO4) as silica and titanium sources. Like ETS-10 and ETAS-10, the (Na + K)/Na molar ratio has significant effect on the crystallinity and especially purity of final product. The 23 factorial methods suggest that the effect of alkalinity on the crystallinity is the most significant for the crystallization of pure ETGS-10. The activation energies calculated from kinetic study also suggest that once nuclei are formed, the transition and crystallization stages of ETGS-10 tend to proceed at a similar rate. Finally, 29Si- and 71Ga-MAS NMR studies clearly indicate that Ga has been isomorphously substituted for Si tetrahedral site.

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Acknowledgment

This work was supported by the Carbon Dioxide Reduction & Sequestration R&D Center (CDRS), one of the 21st Century Frontier R&D Programs in Korea.

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Authors and Affiliations

  1. Department of Materials Chemistry and Engineering, College of Engineering, Kon Kuk University, Seoul, 143-701, South Korea

    S. D. Kim, S. H. Noh, J. Y. Jung, J. Y. Hwang & W. J. Kim

  2. Department of Chemical Engineering, College of Engineering, Inha University, Inchon, South Korea

    W. S. Ahn

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  1. S. D. Kim
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  2. S. H. Noh
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  3. J. Y. Jung
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  4. J. Y. Hwang
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Correspondence to W. J. Kim.

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Kim, S.D., Noh, S.H., Jung, J.Y. et al. Hydrothermal synthesis of gallium-substituted titanosilicate, ETGS-10. J Porous Mater 17, 49–56 (2010). https://doi.org/10.1007/s10934-009-9263-x

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  • DOI: https://doi.org/10.1007/s10934-009-9263-x

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