Study of Water Adsorption on EDTA-Modified LTA Zeolites

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 N(2) physisorption analyses. The wat...

Descripción completa

Detalles Bibliográficos
Autores principales: Volavšek, Janez, Pliekhov, Oleksii, Pliekhova, Olena, Mali, Gregor, Zabukovec Logar, Nataša
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9027755/
https://www.ncbi.nlm.nih.gov/pubmed/35458059
http://dx.doi.org/10.3390/nano12081352
Descripción
Sumario: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 N(2) 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 Ca(2+)) and the EDTA concentration.

Ejemplares similares