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Journal of Sol-Gel Science and Technology
Erschienen in: Journal of Sol-Gel Science and Technology 1/2017

24.12.2016 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Influence of alcohol solvents on morphology of hollow silica–alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane

verfasst von: Naoki Toyama, Shinobu Ohki, Masataka Tansho, Tadashi Shimizu, Tetsuo Umegaki, Yoshiyuki Kojima

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 1/2017

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Abstract

In this study, we reported effect of alcohol solvents on morphology of hollow silica–alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane. Silica–alumina composite shell was coated on polystyrene template particles via sol–gel reaction in various alcohol solvents. The hollow spheres were prepared in methanol, ethanol and 2-propanol for 36, 17 and 8 h, respectively. The results indicate that the order of sol–gel reaction rate was 2-propanol > ethanol > methanol. Amount of hydrogen evolution of the hollow spheres prepared in methanol and ethanol were higher than that of the hollow spheres prepared in 2-propanol. From the results of solid-state 27Al nuclear magnetic resonance spectra, we found that aluminum species of the hollow spheres prepared in methanol and ethanol were highly dispersed in their silica matrix. The results of temperature programed dispersion of ammonia showed that all the hollow spheres have weak and strong Brønsted acid sites. The amount of weak Brønsted acid sites in all the hollow spheres were of same level, while the amount of strong Brønsted acid sites increase with decrease of sol–gel reaction rate. These results indicate that the sol–gel reaction rate influences the dispersion of aluminum species, and highly dispersed aluminum species lead to increase in the amount of Brønsted acid sites.

Graphical Abstract

https://static-content.springer.com/image/art%3A10.1007%2Fs10971-016-4287-6/MediaObjects/10971_2016_4287_Figa_HTML.gif
Vorheriger Artikel Synthesis of δ-MnO2 with nanoflower-like architecture by a microwave-assisted hydrothermal method
Nächster Artikel Mesoporous Bi2WO6 sheets synthesized via a sol–gel freeze-drying method with excellent photocatalytic performance

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Metadaten
Titel
Influence of alcohol solvents on morphology of hollow silica–alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane
verfasst von
Naoki Toyama
Shinobu Ohki
Masataka Tansho
Tadashi Shimizu
Tetsuo Umegaki
Yoshiyuki Kojima
Publikationsdatum
24.12.2016
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 1/2017
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-016-4287-6

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