Layered perovskite Y1-xCaxBaCo4O7+8 as ceramic membranes for oxygen separation
MetadataShow full item record
Layer-structured mixed conducting oxides with the composition Y1−xCaxBaCo4O7+δ (x = 0.0–0.4) were synthesized and their performance as oxygen separating membranes was explored. The crystal structure, phase stability, oxygen absorption/desorption properties, and electrical conductivity of the oxides, as well as oxygen permeation fluxes of the corresponding membranes, were systematically investigated. The properties of YBaCo4O7+δ-based oxides were greatly improved by Ca incorporation into the lattice structure at an optimal concentration. In the series Y1−xCaxBaCo4O7+δ, the Y0.8Ca0.2BaCo4O7+δ membrane exhibited the highest oxygen permeation flux, reaching a value of 0.75 × 10−6 mol cm−2 s−1 at 900 °C under the conditions of air/helium oxygen gradient and a membrane thickness of 1.0 mm. Studies of the effect of membrane thickness on the oxygen fluxes implied that at membrane thicknesses larger than 0.7 mm, the permeation process was mainly controlled by bulk diffusion, indicating the potential to further improve the oxygen fluxes via thinner membranes of asymmetric structure.
Showing items related by title, author, creator and subject.
Shao, Xin; Dong, Dehua; Parkinson, Alan; Li, Chun-Zhu (2014)Microchanneled membranes have demonstrated high oxygen permeation fluxes owing to the shortened oxygen permeation distance and the enlarged membrane surface area. In this study, further improvement of the oxygen permeation ...
Zhang, Z.; Chen, Y.; Tade, Moses; Hao, Y.; Liu, Shaomin; Shao, Zongping (2014)In this study, we propose a new tin-doped perovskite oxide, BaCo0.7Fe0.2Sn0.1O3-δ (BCFSn0.1), as a promising alternative material for a ceramic oxygen-permeating membrane. A high energy ball milling-assisted solid-state ...
Zhang, X.; Motuzas, J.; Liu, Shaomin; Diniz da Costa, J. (2017)This work investigates the partial substitution of Zn in the B-site of perovskite as Ba 0.5 Sr 0.5 (Co 0.8 Fe 0.2 ) 1- x Zn x O 3- d . The membranes were tested for oxygen separation from air and Zn incorporation into the ...