Thermodynamic and kinetic analyses of the CO<inf>2</inf> chemisorption mechanism on Na<inf>2</inf>TiO<inf>3</inf>: Experimental and theoretical evidences

Pedro Sánchez-Camacho, Issis C. Romero-Ibarra, Yuhua Duan, Heriberto Pfeiffer

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Abstract

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 Na2TiO 3 was systematically analyzed to determine the influence of temperature. The CO2 chemisorption capacity of Na2TiO 3 was evaluated both dynamically and isothermally, and the products were reanalyzed to elucidate the Na2TiO3-CO2 reaction mechanism. Different chemical species (Na2CO3, Na2O, and Na4Ti5O12 or Na 16Ti10O28) were identified during the CO 2 capture process in Na2TiO3. In addition, some CO2 chemisorption kinetic parameters were determined. The ΔH‡ was found to be 140.9 kJ/mol, to the Na 2TiO3-CO2 system, between 600 and 780 °C. Results evidenced that CO2 chemisorption on Na2TiO 3 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, Na4Ti5O 12, and Na16Ti10O28) sodium titanates were fully investigated. © 2014 American Chemical Society.
Original languageAmerican English
Pages (from-to)19822-19832
Number of pages17838
JournalJournal of Physical Chemistry C
DOIs
StatePublished - 1 Jan 2014
Externally publishedYes

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