Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability

Zhang, Kun, Ran, Ran, Ge, Lei, Shao, Zongping, Jin, Wanqin and Xu, Nanping (2008) Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability. Journal of Membrane Science, 323 2: 436-443. doi:10.1016/j.memsci.2008.07.002


Author Zhang, Kun
Ran, Ran
Ge, Lei
Shao, Zongping
Jin, Wanqin
Xu, Nanping
Title Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability
Formatted title
Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2008-10
Sub-type Article (original research)
DOI 10.1016/j.memsci.2008.07.002
Volume 323
Issue 2
Start page 436
End page 443
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
SrCo1−yNbyO3−δ (y = 0.025–0.4) were synthesized for oxygen separation application. The crystal structure, phase stability, oxygen nonstoichiometry, electrical conductivity, and oxygen permeability of the oxides were systematically investigated. Cubic perovskite, with enhanced phase stability at higher Nb concentration, was obtained at y = 0.025–0.2. However, the further increase in niobium concentration led to the formation of impurity phase. The niobium doping concentration also had a significant effect on electrical conductivity and oxygen permeability of the membranes. SrCo0.9Nb0.1O3−δ exhibited the highest electrical conductivity and oxygen permeability among the others. It reached a permeation flux of ∼2.80 × 10−6 mol cm−2 s−1 at 900 °C for a 1.0-mm membrane under an air/helium oxygen gradient. The further investigation demonstrated the oxygen permeation process was mainly rate-limited by the oxygen bulk diffusion process.
Keyword oxygen permeation
perovskite
mixed conductor
SrCoO3-delta
ceramic membrane
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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