Interplay between alkali-metal cations and silanol sites in nanosized CHA zeolite: implications for CO2 adsorption - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Communications Chemistry Année : 2023

Interplay between alkali-metal cations and silanol sites in nanosized CHA zeolite: implications for CO2 adsorption

Résumé

Silanols are key players on application performance of zeolites; yet, their localization and hydrogen bonding strength need more studies. The effects of post-synthetic ion-exchange on nanosized chabazite (CHA), focusing on the formation of silanols, was studied. The significant alteration of the silanols of the chabazite nanozeolite upon ion-exchange and their effect on the CO 2 adsorption capacity was revealed by solid-state nuclear magnetic resonance (NMR), Fourier-transform infrared (FTIR) spectroscopy, and periodic density functional theory (DFT) calculations. Both theoretical and experimental results revealed changing the ratio of extra-framework cations in CHA zeolites changes the population of silanols; decreasing the Cs + /K + ratio creates more silanols. Upon adsorption of CO 2 the distribution and strength of the silanols also changed with increased hydrogen bonding, thus revealing an interaction of silanols with CO 2 molecules. To the best of our knowledge, this is the first evidence of the interplay between alkali-metal cations and silanols in nanosized CHA.
Fichier principal
Vignette du fichier
Communications-chemistry-2023.pdf (1.18 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04283478 , version 1 (13-11-2023)

Licence

Paternité

Identifiants

Citer

Sajjad Ghojavand, Eddy Dib, Jérôme Rey, Ayoub Daouli, Edwin Clatworthy, et al.. Interplay between alkali-metal cations and silanol sites in nanosized CHA zeolite: implications for CO2 adsorption. Communications Chemistry, 2023, 6, pp.134. ⟨10.1038/s42004-023-00918-1⟩. ⟨hal-04283478⟩
27 Consultations
14 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More