Incorporation of trivalent cations in NaX zeolite nanocrystals for the adsorption of O 2 in the presence of CO 2 - Normandie Université Access content directly
Journal Articles Physical Chemistry Chemical Physics Year : 2020

Incorporation of trivalent cations in NaX zeolite nanocrystals for the adsorption of O 2 in the presence of CO 2

Abstract

The O2 and CO2 sorption properties of nanosized zeolite X with faujasite type structure through a partial ionic exchange of sodium (Na +) by trivalent cations (Gd 3+ and Ce 3+) were evaluated. Three faujasite samples were studied, the as-synthesized Na-X possessing Na + solely, and the modified samples Na-Gd-X and Na-Ce-X containing Gd 3+ (1.8 wt%) and Ce 3+ (0.82 wt%), respectively. Incorporating scarce amounts of trivalent cations modified the adsorption affinity of zeolites towards O2 and CO2 as demonstrated by in situ Fourier-transform infrared spectroscopy (FTIR). While Na-Ce-X encounters the highest O2 physisorption capacity, the Na-Gd-X is adsorbing the highest quantities of molecular CO2. All three samples exhibit the chemisorbed CO2 in the form of carbonates, while the Na-X stores carbonates in monodentate and polydentate forms, the Na-Gd-X and Na-Ce-X allow the formation of polydentate carbonates only. Density functional theory (DFT) calculations revealed that trivalent cations tend to adsorb gases through two cations simultaneously which explains the presence of polydentate carbonates exclusively in the corresponding modified zeolites. The DFT results confirmed the higher affinity of Na-Gd-X and Na-Ce-X nanocrystals towards O2 in the presence of CO2. The affinity of Na-Gd-X and Na-Ce-X nanocrystals towards O2 opens the door of their use as oxygen transporters for medical applications where CO2 is constantly present. The toxicity of the nanosized zeolites and their performance in O2 release are reported too.
Fichier principal
Vignette du fichier
262.pdf (1.53 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03027929 , version 1 (27-11-2020)

Identifiers

Cite

Sarah Komaty, Ayoub Daouli, Michael Badawi, Clément Anfray, Moussa Zaarour, et al.. Incorporation of trivalent cations in NaX zeolite nanocrystals for the adsorption of O 2 in the presence of CO 2. Physical Chemistry Chemical Physics, 2020, 22 (18), pp.9934-9942. ⟨10.1039/D0CP00111B⟩. ⟨hal-03027929⟩
121 View
300 Download

Altmetric

Share

Gmail Facebook X LinkedIn More