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

作　　者：Charly Mve Mfoumou Francis Ngoye Pradel Tonda-Mikiela Ferdinand Evoung Evoung Landry Biyoghe Bi-Ndong Thomas Belin Samuel Mignard Charly Mve Mfoumou;Francis Ngoye;Pradel Tonda-Mikiela;Ferdinand Evoung Evoung;Landry Biyoghe Bi-Ndong;Thomas Belin;Samuel Mignard(Laboratoire de Chimie des Milieux et des Matériaux Inorganiques (LC2MI), URCHI/Universitédes Sciences et Techniques de Masuku (USTM), Franceville, Gabon;Département de Chimie, Facultédes Sciences, Universitédes Sciences et Techniques de Masuku (USTM), Franceville, Gabon;Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), UMR 7285 CNRS/Universitéde Poitiers, 4 Rue Michel Brunet, Poitiers Cedex, France)

机构地区：[1]Laboratoire de Chimie des Milieux et des Maté riaux Inorganiques (LC2MI), URCHI/Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon [2]Dé partement de Chimie, Faculté des Sciences, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon [3]Institut de Chimie des Milieux et Maté riaux de Poitiers (IC2MP), UMR 7285 CNRS/Université de Poitiers, 4 Rue Michel Brunet, Poitiers Cedex, France

出　　处：《Journal of Environmental Protection》2023年第1期66-82,共17页环境保护（英文）

摘　　要：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-</sup>) on the exchanged zeolites E-CaX and E-BaX are about 81 kJ·mol^-1, higher than the desorbed species (bicarbonates: HCO₃2-</sup>) 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.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-</sup>) on the exchanged zeolites E-CaX and E-BaX are about 81 kJ·mol^-1, higher than the desorbed species (bicarbonates: HCO₃2-</sup>) 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.

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

分 类 号：O64[理学—物理化学]