ENHANCED RESOLUTION IN THE H-1-NMR SPECTRA OF ZEOLITE H-ZSM-5 BY HETERONUCLEAR DIPOLAR-DEPHASING SPIN-ECHO MAS

被引：61

作者：

FREUDE, D

机构：

[1] Universität Leipzig, Abteilung Grenzflächenphysik, D-04103 Leipzig

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 235卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(95)00091-H

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dipolar-dephasing with high power Al-27 irradiation yields H-1 MAS NMR echo spectra of 'aluminium-unconnected' hydroxyl groups in dehydrated zeolites. The aluminium-connected SiOHal and AlOH hydroxyls can be observed as the difference spectra. The technique increases the number of OH lines in the 1H NMR spectra of dehydrated zeolite H-ZSM-5. Two kinds of Bronsted sites can be distinguished and interpreted in terms of their mobility in the vicinity of framework aluminium atoms.

引用

页码：69 / 75

页数：7

共 22 条

[1] H-1(AL-27) DOUBLE-RESONANCE EXPERIMENTS IN SOLIDS - AN UNEXPECTED OBSERVATION IN THE H-1 MAS SPECTRUM OF ZEOLITE HZSM-5 [J].