One‐step synthesis of ordered Sn‐substituted SBA‐16 mesoporous materials using prepared silica source of rice husk and their selectively catalytic activity |
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Authors: | Sy‐Thang Ho Quang‐Khieu Dinh Thai‐Hoa Tran Huu‐Phu Nguyen Thanh‐Dinh Nguyen |
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Affiliation: | 1. Department of Chemistry, Pedagogical University of Dong Thap, Dong Thap 84067, Viet Nam;2. Department of Chemistry, Faculty of Sciences, Hue University, Hue 84054, Viet Nam;3. Institute of Chemistry, Vietnamese Academy of Science and Technology, Ha Noi 84004, Viet Nam;4. Department of Chemical Engineering, Laval University, Quebec G1K 7P4, Canada |
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Abstract: | Highly ordered SBA‐16 silica mesoporous materials were synthesised hydro‐solvothermally under the acidic medium using SiO2/F127/BuOH/HCl/H2O gel. Pure SiO2 powders were prepared from inexpensive and environmentally friendly silica source of rice husk. The pore size of the materials could be optimised by using a blend of P123 and F127 templates. Sn‐substituted SBA‐16 mesoporous materials were yielded via the direct injection of stannic chloride into the fixed gel in acidic medium. X‐ray diffraction, N2 adsorption, scanning electron microscope/transmission electron microscope results suggest that tin ions were incorporated into the Si‐SBA‐16 framework by isomorphous substitution between Sn and Si ions. Elemental analysis indicates that tin can be substituted in the range of Si/Sn = 21.4–10.5. UV–vis, XPS, TPR‐H2, TPD‐NH3 results reveal that tin atoms are highly dispersed in 4+ oxidation state and mostly occupy in the silica framework. The degree of tin incorporation into silica framework can easily be controlled by a simply adjustment of the H2O and HCl molar ratios. The mesoporous Sn‐SBA‐16 materials were an active benzylation catalyst with almost 100% selectivity to monoalkylated product in alkylation of aromatics with benzyl chloride. © 2011 Canadian Society for Chemical Engineering |
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Keywords: | mesoporous Sn‐substituted SBA‐16 incorporation self‐assembly structure‐directing agent alkylation aromatics monoalkylation |
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