کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5420821 | 1395473 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
TRAPDOR double-resonance and high-resolution MAS NMR for structural and template studies in zeolite ZSM-5
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: TRAPDOR double-resonance and high-resolution MAS NMR for structural and template studies in zeolite ZSM-5 TRAPDOR double-resonance and high-resolution MAS NMR for structural and template studies in zeolite ZSM-5](/preview/png/5420821.png)
چکیده انگلیسی
A combination of 27Al magic-angle spinning (MAS)/multiple-quantum (MQ) MAS, and 27Al-{14N} TRAnsfer of Population in DOuble-Resonance (TRAPDOR) nuclear magnetic resonance (NMR) was used to study aluminium environments in zeolite ZSM-5. 27Al-{14N} TRAPDOR experiments, in combination with 14N NMR were employed to show that the two tetrahedral peaks observed in the 27Al MAS/3Q-MAS spectra of as-synthesized ZSM-5 are due to aluminium atoms occupying crystallographically inequivalent T-sites. A 13C-{27Al} TRAPDOR experiment was used to study the template, tetrapropyl ammonium bromide (TPABr), in the three-dimensional pore system of ZSM-5. The inequivalency of the methyl groups of TPA was observed in the 13C-{27Al} TRAPDOR spectra of as-synthesized ZSM-5 and the motion of the methyl end of the propyl chain appeared to be more restricted in the sinusoidal channel than in the straight channel.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 35, Issue 2, April 2009, Pages 61-66
Journal: Solid State Nuclear Magnetic Resonance - Volume 35, Issue 2, April 2009, Pages 61-66
نویسندگان
Anuji Abraham, Roel Prins, Jeroen A. van Bokhoven, Ernst R.H. van Eck, Arno P.M. Kentgens,