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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

1
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2
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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Abstract

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
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MDPI and ACS Style

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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