Thermodynamic and Kinetic Analyses of the CO2 Chemisorption Mechanism on Na2TiO3: Experimental and Theoretical Evidences

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• 作者：Pedro S谩nchez-Camacho ; Issis C. Romero-Ibarra ; Yuhua Duan ; Heriberto Pfeiffer
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 28, 2014
• 年：2014
• 卷：118
• 期：34
• 页码：19822-19832
• 全文大小：653K
• ISSN：1932-7455

文摘

Sodium metatitanate (Na₂TiO₃) was successfully synthesized via a solid-state reaction. The Na₂TiO₃ structure and microstructure were characterized using X-ray diffraction, scanning and transmission electron microscopy, and N₂ adsorption. Then, the CO₂ chemisorption mechanism on Na₂TiO₃ was systematically analyzed to determine the influence of temperature. The CO₂ chemisorption capacity of Na₂TiO₃ was evaluated both dynamically and isothermally, and the products were reanalyzed to elucidate the Na₂TiO₃鈥揅O₂ reaction mechanism. Different chemical species (Na₂CO₃, Na₂O, and Na₄Ti₅O₁₂ or Na₁₆Ti₁₀O₂₈) were identified during the CO₂ capture process in Na₂TiO₃. In addition, some CO₂ chemisorption kinetic parameters were determined. The 螖H^{猝?/sup> was found to be 140.9 kJ/mol, to the Na₂TiO₃鈥揅O₂ system, between 600 and 780 掳C. Results evidenced that CO₂ chemisorption on Na₂TiO₃ highly depends on the reaction temperature. Furthermore, the experiments were theoretically supported by different thermodynamic calculations. The calculated thermodynamic properties of CO₂ capture reactions by (Na₂TiO₃, Na₄Ti₅O₁₂, and Na₁₆Ti₁₀O₂₈) sodium titanates were fully investigated.}