Effect of the type of preparation on the properties of titania/silicas

Makoto Toba, Fujio Mizukami (Corresponding Author), Shu-ichi Niwa, Tsuneji Sano, Kazuyuki Maeda, Arto Annila, Veikko Komppa

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34 Citations (Scopus)

Abstract

Titania/silicas were prepared by four methods: (i) complexing-agent assisted sol—gel, (ii) coprecipitation, (iii) hydrogel kneading and (iv) xerogel kneading. The properties of these titania/silicas were investigated by thermal gravimetry and differential thermal analysis (TG-DTA) X-ray powder diffraction, solid-state magic angle spinning nuclear magnetic resonance (MAS NMR), ammonia temperature programmed desorption (TPD) and nitrogen adsorption. Of the four methods, the complexing-agent assisted sol—gel method gave the most homogeneous titania/silicas. Their TiOSi bond formation, acidities, and specific surface areas depended on completing agents used in the preparations and the Ti/Si ratios of raw materials. In contrast, the kneading titania/silicas were heterogeneous and their properties did not depend on the Ti/Si ratio. The dependence of properties of coprecipitated titania/silicas on their Ti/Si ratio were intermediate between those of complexing-agent assisted sol—gel and kneading.
Original languageEnglish
Pages (from-to)277-289
Number of pages13
JournalJournal of Molecular Catalysis
Volume91
Issue number2
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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    Toba, M., Mizukami, F., Niwa, S., Sano, T., Maeda, K., Annila, A., & Komppa, V. (1994). Effect of the type of preparation on the properties of titania/silicas. Journal of Molecular Catalysis, 91(2), 277-289. https://doi.org/10.1016/0304-5102(94)00040-9