کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1489465 992307 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of acid–base bifunctional mesoporous materials by oxidation and thermolysis
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Synthesis of acid–base bifunctional mesoporous materials by oxidation and thermolysis
چکیده انگلیسی

A novel and efficient method has been developed for the synthesis of acid–base bifunctional catalyst SO3H–MCM-41–NH2. This method was achieved by co-condensation of tetraethylorthosilicate (TEOS), 3-mercaptopropyltrimethoxysilane (MPTMS) and (3-triethoxysilylpropyl) carbamicacid-1-methylcyclohexylester (3TAME) in the presence of cetyltrimethylammonium bromide (CTAB), followed by oxidation and then thermolysis to generate acidic site and basic site. X-ray diffraction (XRD) and transmission electron micrographs (TEM) show that the resultant materials keep mesoporous structure. Thermogravimetric analysis (TGA), X-ray photoelectron spectra (XPS), back titration, solid-state 13C CP/MAS NMR and solid-state 29Si MAS NMR confirm that the organosiloxanes were condensed as a part of the silica framework. The bifunctional sample (SO3H–MCM-41–NH2) containing amine and sulfonic acids exhibits excellent acid-basic properties, which make it possess high activity in aldol condensation reaction between acetone and various aldehydes.

A novel and efficient method has been developed for the synthesis of acid–base bifunctional catalyst. The obtained sample of SO3H–MCM-41–NH2 containing amine and sulfonic acids exhibits excellent catalytic activity in aldol condensation reaction.Figure optionsDownload as PowerPoint slideResearch highlights
► Synthesize acid–base bifunctional mesoporous materials SO3H–MCM-41–NH2.
► Oxidation and then thermolysis to generate acidic site and basic site.
► Exhibit good catalytic performance in aldol condensation reaction between acetone and various aldehydes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 46, Issue 6, June 2011, Pages 951–957
نویسندگان
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