TY - JOUR
T1 - Thermodynamics of the CO 2 absorption in BaCeO 3 and SrCeO 3 using thermogravimetric and differential thermal analyses
AU - Niwa, Eiki
AU - Kondo, Kaori
AU - Aoki, Masatake
AU - Sato, Ryuhei
AU - Yoshizawa, Ryo
AU - Fujishiro, Fumito
AU - Yashima, Masatomo
AU - Hashimoto, Takuya
N1 - Funding Information:
The authors thank Mr. R. Shima (Nihon Univ.) for his assistance with the sample preparation and XRD measurements. This work was partly supported by JSPS KAKENHI Grant Number JP16K05886 and 17K17717.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/1
Y1 - 2019/1
N2 - The reaction mechanism of AeCeO 3 (Ae: Sr, Ba) with CO 2 and its thermodynamics were investigated using scanning-type thermogravimetric/differential thermal analysis, TG-DTA, at different CO 2 partial pressures, P(CO 2 ), to estimate their potential as CO 2 absorbents. The standard Gibbs free energy change, ΔG° of SrCeO 3 +CO 2 ↔ SrCO 3 +CeO 2 and BaCeO 3 +CO 2 ↔ BaCO 3 +CeO 2 were estimated from equilibrium temperature obtained by the thermogravimetric analyses at different P(CO 2 ). From an Ellingham diagram, the standard entropy change, ΔS° and standard enthalpy change, ΔH° of each reaction were determined. The obtained ΔS° and ΔH° values of the former reaction showed fair agreement with the thermodynamic calculation, whereas those of the latter reaction showed discrepancies from those of the thermodynamic calculations. The Ellingham diagram also suggested that SrCeO 3 was superior to BaCeO 3 as a CO 2 absorbent because the temperature region of SrCeO 3 for which the absorption reaction occurred was higher than that for BaCeO 3 at constant P(CO 2 ).
AB - The reaction mechanism of AeCeO 3 (Ae: Sr, Ba) with CO 2 and its thermodynamics were investigated using scanning-type thermogravimetric/differential thermal analysis, TG-DTA, at different CO 2 partial pressures, P(CO 2 ), to estimate their potential as CO 2 absorbents. The standard Gibbs free energy change, ΔG° of SrCeO 3 +CO 2 ↔ SrCO 3 +CeO 2 and BaCeO 3 +CO 2 ↔ BaCO 3 +CeO 2 were estimated from equilibrium temperature obtained by the thermogravimetric analyses at different P(CO 2 ). From an Ellingham diagram, the standard entropy change, ΔS° and standard enthalpy change, ΔH° of each reaction were determined. The obtained ΔS° and ΔH° values of the former reaction showed fair agreement with the thermodynamic calculation, whereas those of the latter reaction showed discrepancies from those of the thermodynamic calculations. The Ellingham diagram also suggested that SrCeO 3 was superior to BaCeO 3 as a CO 2 absorbent because the temperature region of SrCeO 3 for which the absorption reaction occurred was higher than that for BaCeO 3 at constant P(CO 2 ).
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U2 - 10.1016/j.materresbull.2018.06.033
DO - 10.1016/j.materresbull.2018.06.033
M3 - Article
AN - SCOPUS:85054343092
VL - 109
SP - 213
EP - 221
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
ER -