Oxygen permeation properties of Sm/Sr co-doped ceria decorated Ba0.5Sr0.5Co0.8Fe0.2O3-delta hollow fiber membrane

Abstract

A series of one-side closed Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) hollow fiber membrane decorated with Sm/Sr co-doped ceria (SSDC) with Ce-0.8(Sm1-xSrx)(0.2)O2-delta compositions have been studied as a function of strontium content (x = 0.0, 0.3, 0.5, and 0.7) for high temperature vacuum driven oxygen separation from air. The oxygen permeation flux of all SSDC-decorated BSCF hollow fiber membranes is higher than that decorated with Sm-doped ceria (SDC, x = 0.0). The BSCF hollow fiber membrane decorated with SSDC with Sr content x = 0.5 exhibits the highest among the series (8 mL/cm(2)min, 950 degrees C), which can be mainly ascribed to the increase of oxygen vacancies for the surface exchange reaction. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.