Oxygen selective membranes based on B-site cation-deficient (Ba0.5Sr0.5)(Co0.8Fe0.2)yO3−δ perovskite with improved operational stability

Ge, Lei and Ran, Ran and Zhang, Kun and Liu, Shaomin and Shao, Zongping (2008) Oxygen selective membranes based on B-site cation-deficient (Ba0.5Sr0.5)(Co0.8Fe0.2)yO3−δ perovskite with improved operational stability. Journal of Membrane Science, 318 (1). pp. 182-190. ISSN 0376-7388

Abstract

(Ba0.5Sr0.5)(Co0.8Fe0.2)yO3-δ ((BS)(CF)y, 1.00 ≥ y ≥ 0.77) oxides were investigated for oxygen separation application with emphasis on long-term operational stability. Pure phase cubic perovskite was formed at y ≥ 0.83. The oxygen nonstoichiometry increased while electrical conductivity and permeability decreased with the decrease of y. However, the (BS)(CF)0.97 membrane still displayed an attractive oxygen flux as high as 2.4 × 10-6 mol cm-2 s-1 at 900 °C, as compared to 2.5 × 10-6 mol cm-2 s-1 for a cation stoichiometric BSCF membrane. The B-site deficiency greatly restrained the A-site cation diffusion and stabilized the perovskite structure and permeation properties of the membranes. During the long-term operation of the (BS)(CF)0.97 membrane at 850 °C for more than 300 h, a stable permeation flux of (1.8 ± 0.3) × 10-6 mol cm-2 s-1 was achieved. Further investigation demonstrated that the improved importance of oxygen bulk-diffusion regime in the rate-determination of oxygen permeation through the membranes.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 07 Aug 2019 03:19
Last Modified: 09 Aug 2019 04:54
Uncontrolled Keywords: oxygen permeation, perovskite, ceramic membrane, Ba0.5Sr0.5Co0.8Fe0.2O3−ı
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics
Identification Number or DOI: 10.1016/j.memsci.2008.02.015
URI: http://eprints.usq.edu.au/id/eprint/36467

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