کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483013 991585 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-crystalline mesoporous aluminosilicates catalysts: Synthesis, characterization and catalytic applications
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Non-crystalline mesoporous aluminosilicates catalysts: Synthesis, characterization and catalytic applications
چکیده انگلیسی

Non-crystalline mesoporous aluminosilicate materials were synthesized using citric acid as a pore-forming agent. The amount of Al incorporated in the mesoporous framework could be controlled by adjusting the addition of citric acid. The analytical techniques of N2 adsorption/desorption and transmission electron micrographs (TEM) had been applied to characterize the textural properties of the new mesoporous materials. 27Al nuclear magnetic resonance (27Al MAS NMR) and temperature-programmed desorption (NH3-TPD) of ammonia techniques suggested that most of the Al was present in tetrahedral coordination and imparted acid sites. Tert-butylation of phenol was carried out to evaluate the catalytic activity of the novel mesoporous aluminosilicate catalysts. In addition, the influence of various reaction parameters such as reaction time, reaction temperature, and reactant ratio and weight hourly space velocity were also studied. At the reaction temperature of 418 K, phenol conversion of 92.3% and 2,4-di-tert-butyl phenol selectivity of 45.7% over the optimum novel catalyst (CA-32) were observed, which was much higher than those over the conventional mesoporous Al-MCM-41 catalyst.

Research Highlights
► Mesoporous materials were synthesized using citric acid as a pore-forming agent.
► The amount of Al could be controlled by adjusting the addition of citric acid.
► The catalytic properties of novel catalysts were much higher than that of Al-MCM-41.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 357, Issue 4, 15 February 2011, Pages 1335–1341
نویسندگان
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