The effect of non-ionic porous domains on supported Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes for O2 separation

Rachadel, Priscila Lemes, Motuzas, Julius, Ji, Guozhao, Hotza, Dachamir and Diniz da Costa, João C. (2014) The effect of non-ionic porous domains on supported Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes for O2 separation. Journal of Membrane Science, 454 382-389. doi:10.1016/j.memsci.2013.11.054


Author Rachadel, Priscila Lemes
Motuzas, Julius
Ji, Guozhao
Hotza, Dachamir
Diniz da Costa, João C.
Title The effect of non-ionic porous domains on supported Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes for O2 separation
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2014-03-15
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.memsci.2013.11.054
Open Access Status
Volume 454
Start page 382
End page 389
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract This work investigates the effect of porosity on the performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) membranes for oxygen separation from air. BSCF membranes were sintered as thin dense layers on porous substrate by dry pressing followed by co-firing. The porous substrate was prepared by an optimised mixture of BSCF and 30wt% porogens (Pluronic® F-68) where the porous substrate and dense layer integrity matched well and delivered mechanically stable membranes. The crystal lattice of both BSCF dense layer and porous substrate were essentially the same as verified by X-ray diffraction and oxygen stoichiometry measurements. Pure dense membranes always delivered higher oxygen fluxes than the membranes prepared on porous substrates. Interestingly, the oxygen fluxes at 850°C reduced by 33% due to the porous substrate, and this value correlated well with porosity (35%) and the decreased conductivity (30%). Further, the oxygen flux increased each time that the thickness of the porous substrate was reduced. The pores in the porous substrates were found to have no interconnection. Consequently, this created occlusions of non-ionic domains and resulted in reduced electrical conductivity and oxygen fluxes. Nevertheless, the variations in oxygen fluxes for the porous supported membranes followed geometrical relations associated with porosity and thickness of the porous substrate.
Keyword BSCF
Oxygen flux
Porosity
Porous supported membrane
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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