Synthesis of strontium and barium cerate and their reaction with carbon dioxide

• Published in: Solid state ionics 1993-05, Vol.61 (1), p.83-91
• Main Authors: Scholten, M.J., Schoonman, J., van Miltenburg, J.C., Oonk, H.A.J.
• Format: Article
• Language: English
• Subjects: Chemistry; Elements and non-metal compounds (oxides, hydroxides, hydrides, sulfides, carbides, ...); Exact sciences and technology; Inorganic chemistry and origins of life; Preparations and properties
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/0167-2738(93)90338-4

The log p CO2 versus 1/ T relationships of the equilibria (1) ACO 3+CeO 2⇆ACeO 3+CO 2 and ACO 3⇆+CO 2 in whi ch A = Sr or Ba, were investigated. The methods which have been used are: thermodynamic equilibrium calculations, simultaneous thermogravimetry-differential thermal analysis and high-temperature X-ray diffraction. In pure N 2 atmosphere, the synthesis of the creates proceeds via (1) ACO 3←AO+CO 2 and (2) AO+CeO 2←ACeO 3, which is not calculated thermodynamically, but is apparently kinetically more favourable at low temperatures. SrCeO 3 and BaCeO 3 react with 1 atm CO 2 below 1190°C and 1185°C, respectively. For mixtures of CO 2 with other gases, the decomposition temperatures can be estimated from the figures presented.