ENHANCED SI-29 SPIN-LATTICE RELAXATION AND OBSERVATION OF 3-DIMENSIONAL LATTICE CONNECTIVITY IN ZEOLITES BY 2-DIMENSIONAL SI-29 MASS NMR

被引：0
|
作者：
SIVADINARAYANA, C [1 ]
CHOUDHARY, VR [1 ]
GANAPATHY, S [1 ]
机构：
[1] NATL CHEM LAB,DIV PHYS CHEM,POONA 411008,MAHARASHTRA,INDIA
来源：
PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES | 1994年 / 106卷 / 07期
关键词：
SI-29 MAS NMR; SI-29; T-1; ZEOLITES; ZSM-5; T-SITES;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
It is shown that considerable sensitivity enhancement is achieved in the Si-29 MASS NMR spectra of highly siliceous zeolites by pretreating the material with oxygen. The presence of adsorbed molecular oxygen in zeolite channels promotes an efficient Si-29 spin-lattice relaxation via a paramagnetic interaction between the lattice Si-29 T-site and the adsorbed oxygen on zeolite channels. This affords an efficient 2-D data collection and leads to increased sensitivity. The utility of this method is demonstrated in a two-dimensional COSY-45 NMR experiment of a high silica zeolite ZSM-5.
引用
收藏
页码：1557 / 1564
页数：8
相关论文
共 50 条
12345