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Study of Water Adsorption on EDTA-Modified LTA Zeolites
Janez Volavšek1,2, Oleksii Pliekhov1, Olena Pliekhova3
1National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia.
Abstract:
The present work deals with the study of water adsorption on acid-modified zeolites A. Commercial zeolites 4A (Na form) and 5A (Ca form) were subjected to EDTA dealumination, and their structure, textural properties and stability were checked by XRD, EDX, NMR and N2 physisorption analyses. The water adsorption isotherms of the parent zeolites and their modified forms were measured at a temperature of 25 °C and up to a relative pressure of 0.9. The results show that the treatment with EDTA drastically changes the structural properties of the zeolites and increases the water adsorption capacity by up to 10%. The changes depend on the type of extra-framework cations (Na+ and Ca2+) and the EDTA concentration.
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