Zinc-doped BSCF perovskite membranes for oxygen separation

Zhang, Xiaozhen, Motuzas, Julius, Liu, Shaomin and da Costa, Joao C. Diniz (2017) Zinc-doped BSCF perovskite membranes for oxygen separation. Separation and Purification Technology, 189 399-404. doi:10.1016/j.seppur.2017.08.029


Author Zhang, Xiaozhen
Motuzas, Julius
Liu, Shaomin
da Costa, Joao C. Diniz
Title Zinc-doped BSCF perovskite membranes for oxygen separation
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1383-5866
1873-3794
Publication date 2017-08-12
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.seppur.2017.08.029
Open Access Status Not yet assessed
Volume 189
Start page 399
End page 404
Total pages 6
Place of publication Amsterdam, The Netherlands
Publisher Elsevie
Language eng
Abstract This work investigates the partial substitution of Zn in the B-site of perovskite as Ba0.5Sr0.5(CO0.8Fe0.2)(1-x)ZnxO3-delta. The membranes were tested for oxygen separation from air and Zn incorporation into the BSCFZ cubic crystal structure proved to be effective as oxygen fluxes increased as compared with a pure BSCF (x = 0, no Zn). This was attribute to the increase in oxygen vacancy concentration as a function of Zn concentration. As a result, oxygen fluxes for the BSCFZ membranes were 200% (700 degrees C) and 32% (900 degrees C) higher than the BSCF analogue membrane. However, the correlation between oxygen vacancy concentration and oxygen flux diverged for Zn concentrations x >= 0.08, which was associated with the shift and broadening of the main XRD peak 2 theta = 31.81 degrees of the BSCFZ cubic structure caused by an additional oxide phase (Zn0). Zn doping also affected the microstructure of the sintered BSCFZ membranes. Grain boundary dimensions reduced as Zn substitution in the B -site increased to x = 0.06 up to 800 degrees C, resulting in improved oxygen fluxes. Contrary to this, high Zn concentration x >= 0.08 increased grain boundary and reduced oxygen fluxes. Therefore, the Zn solubility into BSCF impact upon the oxygen vacancy and microstructural formation, which in turn affected the transport of oxygen ions through the membrane.
Keyword Hollow-Fiber Membranes
Permeable Membrane
Methane Conversion
Ceramic Membranes
Exchange Kinetics
Oxide Membranes
Bulk Diffusion
Permeation
Ba0.5Sr0.5Co0.8Fe0.2O3-Delta
Temperature
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID FT130100405
51462012
KJLD14076
FT130100405
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Sun, 05 Nov 2017, 09:05:11 EST