کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617614 | 49169 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Functionalization of SBA-15 mesoporous silica with thiol or sulfonic acid groups under the crystallization conditions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
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چکیده انگلیسی
In order to prepare functionalized mesoporous materials with sulfonic acid groups used as solid acid catalysts or as separation materials, a simple secondary modification method has been developed. Based on our previous work, SBA-15 materials with a high surface silanol density were prepared by simultaneously removing templates and crystallizing under acidic and hydrothermal conditions. Then the functionalization of SBA-15 mesoporous silica with thiol groups and the oxidation of thiol to sulfonic acid groups were carried out under the same hydrothermal conditions with a dilute aqueous H2O2 solution as the oxidizing agent. Furthermore, the idea of coupling functionalization and oxidation into one step was tested, and the functionalized SBA-15 materials with sulfonic acid groups (SO3H-SBA-15) that were successfully prepared had an acid exchange capacity reaching 1 mequiv of H+/g of SO3H-SBA-15 as determined by a corrective base titration. SO3H-SBA-15 characterized by FT-IR, NMR, XRD, nitrogen adsorption and desorption, TGA, and hydrothermal stability experiments, exhibited a good long-range order, high specific surface area (about 600 m2/g), uniform pore sizes (about 6 nm), and high thermal and hydrothermal stabilities. SO3Ag-SBA-15 via ion exchange of SO3H-SBA-15 with Ag+ was used to remove dibenzothiophene (DBT) from octane. The adsorption capacity reached as high as 17.0 mg S/g of SO3Ag-SBA-15.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 84, Issues 1â3, 15 September 2005, Pages 275-282
Journal: Microporous and Mesoporous Materials - Volume 84, Issues 1â3, 15 September 2005, Pages 275-282
نویسندگان
L.M. Yang, Y.J. Wang, G.S. Luo, Y.Y. Dai,