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Catalysts 2017, 7(5), 127; doi:10.3390/catal7050127

Well-Shaped Sulfonic Organosilica Nanotubes with High Activity for Hydrolysis of Cellobiose

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh 55181-83111, Iran
Authors to whom correspondence should be addressed.
Academic Editors: Munish Puri and Takuya Tsuzuki
Received: 14 March 2017 / Revised: 8 April 2017 / Accepted: 19 April 2017 / Published: 27 April 2017
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Sulfonic organosilica nanotubes with different acidity densities could be synthesized through the co-condensation of ethenyl- or phenylene-bridged organosilane and 3-mercaptopropyltrimethoxysilane followed by sulfhydryl (–SH) oxidation. Transmission electron microscopy (TEM) analysis and nitrogen adsorption-desorption experiment clearly exhibit the hollow nanotube structures with the diameters of about 5 nm. The compositions of the nanotube frameworks are confirmed by solid state 13C nuclear magnetic resonance (NMR) while X-ray photoelectron spectroscopy (XPS) shows that about 60–80% of SH groups were oxidized to sulfonic acid (SO3H). The acid contents were measured by both elemental analysis (CHNS mode) and acid-base titration experiment, which revealed that the acid density was in the range of 0.74 to 4.37 μmol·m−2 on the solid. These nanotube-based acid catalysts exhibited excellent performances in the hydrolysis of cellobiose with the highest conversion of 92% and glucose selectivity of 96%. In addition, the catalysts could maintain high activity (65% conversion with 92% selectivity) even after six recycles. View Full-Text
Keywords: sulfonic solid acid catalysts; organosilica nanotubes; hydrolysis of cellobiose; acid density sulfonic solid acid catalysts; organosilica nanotubes; hydrolysis of cellobiose; acid density

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, J.; Liu, X.; Zhu, X.; Wang, H.; Rostamnia, S.; Han, J. Well-Shaped Sulfonic Organosilica Nanotubes with High Activity for Hydrolysis of Cellobiose. Catalysts 2017, 7, 127.

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