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Preparation and Oxygen Permeation of SrCo0.4Fe0.4Zr0.2O3-d Mixed-conducting Hollow Fibre Membrane

Author(s): QI L¨¹, DONG Xue-Liang, LIU Zhen-Kun, ZHANG Guang-Ru, JIN Wan-Qin

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 871;
Date: 2010;
Original page

Keywords: dry-wet spinning; hollow fibre membrane; mixed conducting oxide; oxygen permeation

SrCo0.4Fe0.4Zr0.2O3-d (SCFZ) mixed conducting hollow fibre membranes were prepared by a dry-wet spinning technology based on the phase separation theory combined with subsequent sintering process. XRD, SEM, thermal expansion technique and oxygen permeation test were utilized to characterize the crystal phase structures, microstructures, sintering behavior and oxygen permeation flux of SCFZ powder and/or hollow fibre membranes. XRD patterns show that the crystal phase of SCFZ hollow fibre membranes are composed of perovskite main phase, SrZrO3 and Co3O4 impurity phases. The content of SrZrO3 increases with increasing the sintering temperature. The SEM images demonstrate that fingerlike pores exist adjacent to the inner and outer skin layer of membrane wall. Meantime, sponge-like pores appear in the middle zone of wall. This kind of morphology is caused by the immersion phase separation process. From the gastight, mechanical strength, sintering behavior, XRD and SEM results, the optimum sintering temperature of the green membranes is considered to be 1240¡䬠The SCFZ hollow fibre membranes are obtained under the optimum sintering schedule. The sintered SCFZ membranes exhibit high mechanical strength and the fracture strength reaches 74.19MPa. At 850¡䪠the oxygen permeation flux of the membrane is 2.9´10-7mol/(cm2 · s) under air/He gradient, and the flux is stable during the test for more than 160h.
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