NMR invisible aluminum species in dealuminated mordenite zeolite:: a 1H/27Al TRAPDOR NMR study

被引：4
|
作者：
Deng, F [1 ]
Yue, Y [1 ]
Ye, CH [1 ]
机构：
[1] Acad Sinica, Wuhan Inst Phys, Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
来源：
SCIENCE IN CHINA SERIES B-CHEMISTRY | 1998年 / 41卷 / 02期
关键词：
H-1/Al-27; TRAPDOR; Al-27; MAS; NMR invisible Al; mordenite;
D O I：
10.1007/BF02877800
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Various kinds of aluminum species in dealuminated mordenite were investigated in detail, and the quadrupole coupling constants (QCCs) for aluminum atoms associated with these species were obtained by means of the newly introduced H-1/Al-27 TRAPDOR method as well as Al-27 magic angle spinning (MAS) nuclear magnetic resonance (NMR). QCC values of 11.3, 15.3, 13.3 and (14.0 +/- 0.6) MHz were determined from the TRAPDOR profiles for Lewis acid sites, Bronsted acid sites (SiOHAl) and two kinds of non-framework aluminum species Al(OH)(n), respectively. The source of the "invisible Al" is discussed on the basis of the NMR experimental results.
引用
收藏
页码：149 / 155
页数：7
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