A qualitative H NMR study of CHCl3 adsorption on conjugated acid–base pairs in cation exchanged Y-zeolites |
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Authors: | Juha T. Timonen and Tuula T. Pakkanen |
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Affiliation: | Department of Chemistry, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland |
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Abstract: | Solution state 1H NMR is employed to study the mode and strength of chloroform adsorption on conjugated acid–base pairs of cation-exchanged Y-zeolites. 1H 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 on the electronegativity of the cation. |
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Keywords: | Adsorption Cation exchange Chloroform NMR Y-zeolite |
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