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

页码：1557 / 1564

页数：8

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