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

Research output: Contribution to journalArticleScientificpeer-review

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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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Titanium
Silica
Xerogels
Magic angle spinning
Gravimetric analysis
Temperature programmed desorption
Coprecipitation
Hydrogels
Acidity
Specific surface area
X ray powder diffraction
Differential thermal analysis
Ammonia
Raw materials
Nuclear magnetic resonance
Nitrogen
Adsorption

Cite this

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
Toba, Makoto ; Mizukami, Fujio ; Niwa, Shu-ichi ; Sano, Tsuneji ; Maeda, Kazuyuki ; Annila, Arto ; Komppa, Veikko. / Effect of the type of preparation on the properties of titania/silicas. In: Journal of Molecular Catalysis. 1994 ; Vol. 91, No. 2. pp. 277-289.
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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.",
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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, vol. 91, no. 2, pp. 277-289. https://doi.org/10.1016/0304-5102(94)00040-9

Effect of the type of preparation on the properties of titania/silicas. / Toba, Makoto; Mizukami, Fujio (Corresponding Author); Niwa, Shu-ichi; Sano, Tsuneji; Maeda, Kazuyuki; Annila, Arto; Komppa, Veikko.

In: Journal of Molecular Catalysis, Vol. 91, No. 2, 1994, p. 277-289.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Effect of the type of preparation on the properties of titania/silicas

AU - Toba, Makoto

AU - Mizukami, Fujio

AU - Niwa, Shu-ichi

AU - Sano, Tsuneji

AU - Maeda, Kazuyuki

AU - Annila, Arto

AU - Komppa, Veikko

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N2 - 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.

AB - 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.

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