Further improvements in oxygen permeation properties of La0.6Sr0.4Ti0.3Fe0.7O3-delta coated Ba0.5Sr0.5Co0.8Fe0.2O3-delta hollow fiber membrane

Abstract

Oxygen-permeable Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) hollow fiber membranes was prepared by a phase inversion spinning process. In the second stage, La0.6Sr0.4Ti0.3Fe0.7O3-delta (LSTF) was coated on the surface of the prepared BSCF hollow fiber membranes by dip coating method in an attempt to improve not only the oxygen permeation performance but also the long-term chemical stability. The oxygen permeation fluxes were measured in the temperature range of 850-1000 degrees C in air. The oxygen permeation flux reached to 9.18 mL/min/cm(2) at 1000 degrees C. In addition, long-term operation test results indicated that the oxygen permeation fluxes remained consistently during the 240 h operation. With the dual aims of reviewing existing work in the topic and understanding the effects of membrane morphology and thickness on the performance of BSCF membrane, the oxygen permeation property of LSTF-coated BSCF hollow fiber membrane with engineered morphology was compared directly with its corresponding uncoated case and then with other configuration types, such as BSCF disk-shaped and tubular BSCF membranes. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.