کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9610362 47172 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tuning of nanostructured SBA-15 silica using phosphoric acid
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Tuning of nanostructured SBA-15 silica using phosphoric acid
چکیده انگلیسی
A simple method is described to synthesize mesoporous SBA-15 with controlled distinct morphologies. Using the same initial synthesis mixture composition consisting of non-ionic P123 block co-polymer, tetra-ethyl orthosilicate as silica source and phosphoric acid, well-ordered mesoporous films, cakes, fibers and bundle-like structures were produced simply by changing the stirring rate. Free-standing films at the air-water interface and cake-like structures were obtained simultaneously under static conditions. On the other hand, fibers and bundles of threads resulted under vigorous and slow stirring conditions, respectively. Transmission electron microscopy (TEM) images of these bundles revealed straight parallel nanochannels oriented along the long axis of the bundles. X-ray fluorescence (XRF) measurements of the calcined samples indicated the presence of phosphorus, which might provide additional Brønsted acid sites for potential applications in catalysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 105, Issues 3–4, 15 August 2005, Pages 618-622
نویسندگان
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