کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
75444 49115 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gold nanoparticles supported on functionalized mesoporous silica for selective oxidation of cyclohexane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Gold nanoparticles supported on functionalized mesoporous silica for selective oxidation of cyclohexane
چکیده انگلیسی

Gold (Au) nanoparticles of sizes in the range of 2–4 nm dispersed on ordered mesoporous silica were prepared via a one-pot synthesis route in the presence of organosilane mercapto-propyl-trimethoxysilane (MPTMS). MPTMS was found to play a dual role: one was to coordinate the Au precursor (AuCl4-) via its thiol ligands and the other one was to form covalent bonds with the silica matrix. The interaction of the Au species with MPTMS was studied using real-time ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy techniques. The formation of Au (I)–thiolate complexes in the synthesis gel was identified and found to play a crucial role in the dispersion of the final Au nanoparticles on the support. The Au nanoparticles dispersed on the mesoporous silica exhibited high catalytic activity and selectivity in solvent-free selective oxidation of cyclohexane using molecular oxygen.

Fine gold nanoparticles (2–4 nm) were homogeneously immobilized in mesoporous silica via a one-pot synthesis route in the presence of organosilane as a functional agent. The formation mechanism was characterized by using real-time ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy techniques. The gold nanoparticles exhibited a very high activity and selectivity in the solvent-free selective oxidation of cyclohexane using molecular oxygen.Figure optionsDownload as PowerPoint slideResearch highlights
► Mercapto-propyl-trimethoxysilane (MPTMS) was found to play a dual role in the immobilization of gold nanoparticles in mesoporous silica.
► The amount of MPTMS was observed to determine both the quality of the mesostructure and gold loading.
► The formation of Au (I)–thiolate complexes led to a high dispersion of gold.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 141, Issues 1–3, May 2011, Pages 222–230
نویسندگان
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