کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9617754 49168 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sol-gel synthesis of mesostructured aluminas from chemically modified aluminum sec-butoxide using non-ionic surfactant templating
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Sol-gel synthesis of mesostructured aluminas from chemically modified aluminum sec-butoxide using non-ionic surfactant templating
چکیده انگلیسی
This paper reports on the effect that chemical modification of the aluminum sec-butoxide precursor with several chelating ligands has on the structure and textural properties of nanoporous aluminas obtained via a non-ionic surfactant templating approach. Characterization of the samples is carried out by elemental analysis, thermogravimetric analysis coupled to mass spectrometry, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption, X-ray powder diffraction, transmission electron microscopy and 27Al magic angle spinning nuclear magnetic resonance. The catalytic activity in the hydroisomerization of hexane is evaluated for platinum-containing fluorided samples. Chemical modification of the aluminum sec-butoxide promotes the formation of penta- and tetracoordinated aluminum and modifies the alumina porous structure. Higher intrinsic activity is exhibited by catalysts based on these aluminas as compared to those prepared from the unmodified alkoxide, indicating an enhanced acidity of the support.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 80, Issues 1–3, 2 May 2005, Pages 173-182
نویسندگان
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