Journal
CATALYSTS
Volume 7, Issue 5, Pages -Publisher
MDPI AG
DOI: 10.3390/catal7050127
Keywords
sulfonic solid acid catalysts; organosilica nanotubes; hydrolysis of cellobiose; acid density
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Funding
- National Natural Science Foundation of China [21276191, U1662109]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120032120083]
- Natural Science Foundation of Tianjin, China [16JCQNJC06200]
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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 C-13 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 mu mol.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.
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