Proton Transfer in Hydrated Microporous Aluminosilicates:  A 1H NMR Study of Zeolite Chabazite

Proton Transfer in Hydrated Microporous Aluminosilicates:  A 1H NMR Study of Zeolite Chabazite

A NMR approach to in situ precise determination of the proton exchange rate in water molecules sorbed on microporous crystals is presented and applied to hydrated zeolite chabazite and its various ion-substituted forms. This approach has allowed us to measure a frequency of proton exchange in the ra...

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Veröffentlicht in:The journal of physical chemistry. B 2000-07, Vol.104 (29), p.6804-6808
Hauptverfasser: Afanassyev, Igor S, Moroz, Nikolay K, Belitsky, Igor A
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container_title The journal of physical chemistry. B
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creator Afanassyev, Igor S
Moroz, Nikolay K
Belitsky, Igor A
description A NMR approach to in situ precise determination of the proton exchange rate in water molecules sorbed on microporous crystals is presented and applied to hydrated zeolite chabazite and its various ion-substituted forms. This approach has allowed us to measure a frequency of proton exchange in the range from 2 × 101 to 2 × 103 s-1. The observed exchange is interpreted as a result of the proton-transfer reaction between H2O molecules and chemical defects represented by Brønsted acidic sites. For the substances studied, the barrier for this reaction is found to vary in the range 45−60 kJ/mol.
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title Proton Transfer in Hydrated Microporous Aluminosilicates:  A 1H NMR Study of Zeolite Chabazite
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