Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5420821 | Solid State Nuclear Magnetic Resonance | 2009 | 6 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Anuji Abraham, Roel Prins, Jeroen A. van Bokhoven, Ernst R.H. van Eck, Arno P.M. Kentgens,