کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9610211 | 47163 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ti-MCM-41 silylation: Development of a simple methodology for its estimation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ti-MCM-41 was prepared and characterized. The isomorphical substitution of Si4+ by Ti4+ and the presence of mesoporous hexagonal structure were verified. The solid was silylated with increasing quantities of hexamethyldisilazane. This process did not change the structural properties of the solid. Using themogravimetric analysis, the optimal quantity of the silylant agent to neutralize the superficial silanols was evaluated. The non-silylated and the silylated solids (with the optimal quantity) were tested in the limonene oxidation with hydrogen peroxide. The silylated solid showed a greater hydrogen peroxide efficiency and a higher activity and selectivity in the limonene epoxidation, compared with the non-silylated one. These effects are attributed to the higher hydrophobic character of the solid surface, produced by the silanols neutralization.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 397-403
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 397-403
نویسندگان
MarÃa Virginia Cagnoli, Sandra Graciela Casuscelli, Ana MarÃa Alvarez, José Fernando Bengoa, Norma Graciela Gallegos, Mónica Elsie Crivello, Eduardo Renato Herrero, Sergio Gustavo Marchetti,