A qualitative 1H NMR study of CHCl3 adsorption on conjugated acid-base pairs in cation exchanged Y-zeolites

被引：8

作者：

Timonen, JT ^{[1
]}

Pakkanen, TT ^{[1
]}

机构：

[1] Univ Joensuu, Dept Chem, FIN-80101 Joensuu, Finland

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1999年 / 30卷 / 2-3期

关键词：

adsorption; cation exchange; chloroform; NMR; Y-zeolite;

D O I：

10.1016/S1387-1811(99)00044-X

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Solution state H-1 NMR is employed to study the mode and strength of chloroform adsorption on conjugated acid-base pairs of cation-exchanged Y-zeolites. H-1 NMR results indicate that two different surface bonding orientations may exist. An acidic hydrogen site of zeolite favours orientation where the chloroform hydrogen points towards the zeolite cage centre. An exchanged electropositive cation increases the basicity of framework: oxygens of zeolite and directs the chloroform to adsorb on framework oxygens with a hydrogen bond. In this adsorption site the chemical shift of the chloroform hydrogen has a linear dependence an the electronegativity of the cation. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：327 / 333

页数：7

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