کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331000 978988 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of the distance between acidic site and basic site immobilized on mesoporous solid on the activity in catalyzing aldol condensation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
The effect of the distance between acidic site and basic site immobilized on mesoporous solid on the activity in catalyzing aldol condensation
چکیده انگلیسی

Acid–base bifunctional heterogeneous catalysts containing carboxylic and amine groups, which were immobilized at defined distance from one another on the mesoporous solid were synthesized by immobilizing lysine onto carboxyl-SBA-15. The obtained materials were characterized by X-ray diffraction (XRD), N2 adsorption, Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron micrographs (SEM), transmission electron micrographs (TEM), elemental analysis, and back titration. Proximal-C-A-SBA-15 with a proximal acid–base distance was more active than maximum-C-A-SBA-15 with a maximum acid–base distance in aldol condensation reaction between acetone and various aldehydes. It appears that the distance between acidic site and basic site immobilized on mesoporous solid should be an essential factor for catalysis optimization.

Proximal-C-A-SBA-15 with a proximal acid–base distance and maximum-C-A-SBA-15 with a maximum acid–base distance were synthesized by immobilizing lysine onto carboxyl-SBA-15.Figure optionsDownload as PowerPoint slideResearch highlights
► Proximal-C-A-SBA-15 with a proximal acid–base distance.
► Maximum-C-A-SBA-15 with a maximum acid–base distance.
► Compared to maximum-C-A-SBA-15, proximal-C-A-SBA-15 was more active toward aldol condensation reaction between acetone and various aldehydes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 184, Issue 2, February 2011, Pages 289–295
نویسندگان
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