کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10248021 | 49175 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Post-synthesis alumination of SBA-15 in aqueous solution: A versatile tool for the preparation of acidic Al-SBA-15 supports
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
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چکیده انگلیسی
Al-SBA-15 supports were prepared by post-synthesis alumination in aqueous solution of a pure silica SBA-15 material. The effects of the aluminium concentration [Al], and of the hydrolysis ratio h = [TMAOH]/[Al] on the speciation of aluminium ([Al(H2O)6]3+, [Al13O4(OH)24(H2O)20]7+, aluminium polymers) in the solution were examined. Depending on h and [Al], samples with various Si/Al ratios and acidities were obtained. The effects of h and [Al] on the characteristics of the final material were assigned to the speciation of the aluminium in the alumination solution: a correlation between the species present in solution and the Si/Al ratio in the final materials leads us to propose that [Al13O4(OH)24(H2O)20] is the most reactive and effective species toward grafting on the silica surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 85, Issue 3, 7 November 2005, Pages 297-304
Journal: Microporous and Mesoporous Materials - Volume 85, Issue 3, 7 November 2005, Pages 297-304
نویسندگان
Shuangqin Zeng, Juliette Blanchard, Michèle Breysse, Yahua Shi, Xingtian Shu, Hong Nie, Dadong Li,