کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
62982 | 47665 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
NMR spectroscopy and theoretical calculations demonstrate the nature and location of active sites for the Beckmann rearrangement reaction in microporous materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
15N solid-state NMR and theoretical calculations were combined to investigate the Beckmann rearrangement of 15N-cyclohexanone oxime and 15N-cyclododecanone oxime over two MFI-type zeolites as catalysts, H-ZSM-5 and silicalite, containing Brönsted acid sites and silanol groups, respectively. The results demonstrated that the Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam occurs in the interior of the pores of MFI zeolites and that O-protonated ε-caprolactam is formed over the Brönsted acid centers. The acid groups placed at the outer shell of the crystals, probably at the pore mouths, are also active; meanwhile, external silanol groups are significantly less active and less selective than the internal ones.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 249, Issue 1, 1 July 2007, Pages 116–119
Journal: Journal of Catalysis - Volume 249, Issue 1, 1 July 2007, Pages 116–119
نویسندگان
A.B. Fernández, I. Lezcano-Gonzalez, M. Boronat, T. Blasco, A. Corma,