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https://doi.org/10.1016/S1387-1811(00)00352-8

has been cited by the following article:

• TITLE: Study of the Temperature-Programmed Desorption of Carbon Dioxide (CO2) on Zeolites X Modified with Bivalent Cations

  AUTHORS: Charly Mve Mfoumou, Francis Ngoye, Pradel Tonda-Mikiela, Ferdinand Evoung Evoung, Landry Biyoghe Bi-Ndong, Thomas Belin, Samuel Mignard

  KEYWORDS: Adsorption, Faujasite X, Chemisorbed and Physisorbed CO2, Exchanged Zeolites, Bivalent Cations, Temperature-Programmed Desorption (TPD), Infrared

  JOURNAL NAME: Journal of Environmental Protection, Vol.14 No.1, January 31, 2023

  ABSTRACT: Study of physisorbed and chemisorbed carbon dioxide (CO2) species was carried out on the NaX zeolite modified by cationic exchanges with bivalent cations (Ca2+ and Ba2+) by temperature-programmed desorption of CO2 (CO2-TPD). Others results were obtained by infrared to complete the study. The results of this research showed, in the physisorption region (213 - 473 K), that the cationic exchanges on NaX zeolite with bivalent cations increase slightly the interactions of CO2 molecule with adsorbents and/or cationic site. Indeed, the desorption energies of physisorbed CO2 obtained on the reference zeolite NaX (13.5 kJ·mol-1) are lower than that of exchanged zeolites E-CaX and E-BaX (15.77 and 15.17 kJ·mol-1 respectively). In the chemisorbed CO2 region (573 - 873 K), the desorption energies related to desorbed species (bidentate carbonates: CO32-) on the exchanged zeolites E-CaX and E-BaX are about 81 kJ·mol-1, higher than the desorbed species (bicarbonates: HCO32-) on the reference R-NaX (62 kJ·mol-1). In addition, the exchanged E-BaX zeolite develops the secondary adsorption sites corresponding to bicarbonates species with desorption energies of 35 kJ·mol-1 lower to desorption energies of bicarbonates noted on the reference zeolite NaX.