کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617584 | 49169 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
NH4F effect in post-synthesis treatment of Al-MCM-41 mesoporous materials
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
A series of Al-MCM-41 mesoporous molecular sieves, with Si/Al ratio in the range 15-40, were synthesized and characterized by XRD, N2 physisorption, DRIFT and 27Al and 29Si MAS NMR analysis. Al-MCM-41 samples were prepared by two procedures. (i) Synthesis at room temperature, following the procedure described by Grün et al. including some variations. (ii) The as-synthesized samples obtained in (i) were suspended in 300Â mL of NH4F 0.1Â M for 34Â h. Al-MCM-41 samples with high surface acidity were synthesized. The NH4F treatment contributed to enhance these acidic properties, leading to materials highly active in the vaporphase cumene conversion, studied as a catalytic test. The catalytic activity was related to tetrahedral or octahedral aluminum environments for non-fluorinated samples and fluorinated ones, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 84, Issues 1â3, 15 September 2005, Pages 11-20
Journal: Microporous and Mesoporous Materials - Volume 84, Issues 1â3, 15 September 2005, Pages 11-20
نویسندگان
R. Luque, J.M. Campelo, D. Luna, J.M. Marinas, A.A. Romero,