TY - JOUR
T1 - Effects of fabrication processes on oxygen permeation of Nb2O5-doped SrCo0.8Fe0.2O3-δ micro-tubular membranes
AU - Wu, Zhentao
AU - Hidayati Othman, Nur
AU - Zhang, Guangru
AU - Liu, Zhengkun
AU - Jin, Wanqin
AU - Li, K.
PY - 2013/9/1
Y1 - 2013/9/1
N2 - In this study, Nb2O5-doped (0.5wt%) SrCo0.8Fe0.2O3-δ (SCFNb0.5), an oxide of perovskite structure that is chemically and structurally stable for oxygen separation between 550 and 900°C [1], has been used to fabricate two types of micro-tubular membranes, i.e. an asymmetric hollow fibre membrane (SCFNb0.5-HF) and a symmetric capillary membrane (SCFNb0.5-C), using a combined phase inversion and sintering process and plastic extrusion method, respectively. The asymmetric SCFNb0.5-HF membrane is designed to consist of a thin and dense oxygen separation layer (approximately 62μm) supported on a porous finger-like layer (around 415μm) of the same material, with a highly porous inner surface for a significantly reduced mass transfer resistance during oxygen permeation. The separation layer of the symmetric SCFNb0.5-C is approximately 436μm. Besides characterizations on membrane structures, oxygen permeations of the two membranes were measured and compared, and linked to the effects of fabrication processes on membrane performance. Further suggestions are also outlined for the future fabrication of ceramic hollow fibre membranes using the combined phase inversion and sintering technique, especially when ceramic materials with complex compositions are employed.
AB - In this study, Nb2O5-doped (0.5wt%) SrCo0.8Fe0.2O3-δ (SCFNb0.5), an oxide of perovskite structure that is chemically and structurally stable for oxygen separation between 550 and 900°C [1], has been used to fabricate two types of micro-tubular membranes, i.e. an asymmetric hollow fibre membrane (SCFNb0.5-HF) and a symmetric capillary membrane (SCFNb0.5-C), using a combined phase inversion and sintering process and plastic extrusion method, respectively. The asymmetric SCFNb0.5-HF membrane is designed to consist of a thin and dense oxygen separation layer (approximately 62μm) supported on a porous finger-like layer (around 415μm) of the same material, with a highly porous inner surface for a significantly reduced mass transfer resistance during oxygen permeation. The separation layer of the symmetric SCFNb0.5-C is approximately 436μm. Besides characterizations on membrane structures, oxygen permeations of the two membranes were measured and compared, and linked to the effects of fabrication processes on membrane performance. Further suggestions are also outlined for the future fabrication of ceramic hollow fibre membranes using the combined phase inversion and sintering technique, especially when ceramic materials with complex compositions are employed.
KW - Asymmetric hollow fibre membrane
KW - Mixed-conducting ceramics
KW - Oxygen permeation
KW - Perovskite structure
KW - Symmetric capillary membrane
UR - http://www.scopus.com/inward/record.url?scp=84877067388&partnerID=8YFLogxK
UR - https://www.sciencedirect.com/science/article/pii/S0376738813003001?via%3Dihub
U2 - 10.1016/j.memsci.2013.04.020
DO - 10.1016/j.memsci.2013.04.020
M3 - Article
AN - SCOPUS:84877067388
SN - 0376-7388
VL - 442
SP - 1
EP - 7
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -