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Effect of oxygen addition on the thermokinetic properties of CO2 chemisorption on Li2ZrO3 / Lorena Martinez-dlCruz in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9038-9042 Titre : Effect of oxygen addition on the thermokinetic properties of CO2 chemisorption on Li2ZrO3 Type de document : texte imprimé Auteurs : Lorena Martinez-dlCruz, Auteur ; Heriberto Pfeiffer, Auteur Année de publication : 2010 Article en page(s) : pp. 9038-9042 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chemisorption  Carbon  dioxide Résumé : Lithium zirconate doped with potassium (K-Li2ZrO3) was synthesized by solid-state reaction and then its CO2 chemisorption capacity was evaluated using different CO2-O2 gas mixtures. These experiments were performed in order to evaluate the effect produced by the O2 on the kinetic parameters and on the CO2 absorption reaction mechanism. Although the CO2 capture dynamic experiments did not show significant variations as a function of the O2 content, isothermal experiments and their fitting to the Eyring's model did. Different enthalpy activation (ΔH‡) values were estimated for the CO2 chemisorption process, as CO2 capture is produced by two processes: Initially, the CO2 chemisorption occurs directly over the K-Li2ZrO3 surface. Then, once a Li2CO3-ZrO2 external shell is produced, CO2 chemisorption is kinetically controlled by diffusion processes, which must imply the lithium and oxygen diffusion. The ΔH‡ values, of the CO2 direct chemisorption, increased as a function of the O2 content. It was explained in terms of a CO2-O2 competition to occupy the Li2ZrO3 surface. On the other hand, the ΔH‡ values, of the CO2 chemisorption kinetically controlled by diffusion processes, decreased as a function of the O2 content. This result confirmed the oxygen diffusion dependency of the CO2 chemisorption on lithium zirconate. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289634 [article] Effect of oxygen addition on the thermokinetic properties of CO2 chemisorption on Li2ZrO3 [texte imprimé] / Lorena Martinez-dlCruz, Auteur ; Heriberto Pfeiffer, Auteur . - 2010 . - pp. 9038-9042. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9038-9042 Mots-clés : Chemisorption  Carbon  dioxide Résumé : Lithium zirconate doped with potassium (K-Li2ZrO3) was synthesized by solid-state reaction and then its CO2 chemisorption capacity was evaluated using different CO2-O2 gas mixtures. These experiments were performed in order to evaluate the effect produced by the O2 on the kinetic parameters and on the CO2 absorption reaction mechanism. Although the CO2 capture dynamic experiments did not show significant variations as a function of the O2 content, isothermal experiments and their fitting to the Eyring's model did. Different enthalpy activation (ΔH‡) values were estimated for the CO2 chemisorption process, as CO2 capture is produced by two processes: Initially, the CO2 chemisorption occurs directly over the K-Li2ZrO3 surface. Then, once a Li2CO3-ZrO2 external shell is produced, CO2 chemisorption is kinetically controlled by diffusion processes, which must imply the lithium and oxygen diffusion. The ΔH‡ values, of the CO2 direct chemisorption, increased as a function of the O2 content. It was explained in terms of a CO2-O2 competition to occupy the Li2ZrO3 surface. On the other hand, the ΔH‡ values, of the CO2 chemisorption kinetically controlled by diffusion processes, decreased as a function of the O2 content. This result confirmed the oxygen diffusion dependency of the CO2 chemisorption on lithium zirconate. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289634