Evaluation of mixed‐conducting lanthanum‐strontium‐cobaltite ceramic membrane for oxygen separation

Ge, Lei and Shao, Zongping and Zhang, Kun and Ran, Ran and Diniz da Costa, J. C. and Liu, Shaomin (2009) Evaluation of mixed‐conducting lanthanum‐strontium‐cobaltite ceramic membrane for oxygen separation. AI Ch E Journal, 55 (10). pp. 2603-2613. ISSN 0001-1541

Abstract

In this study, La04Sr0.6CoO3-s (LSC) oxide was synthesized via an EDTA-citrate com- plexing process and its application as a mixed-conducting ceramic membrane for oxygen separation was systematically investigated. The phase structure of the powder and microstructure of the membrane were characterized by XRD and SEM, respectively. The optimum condition for membrane sintering was developed based on SEM and four-probe DC electrical conductivity characterizations. The oxygen permeation fluxes at various temperatures and oxygen partial pressure gradients were measured by gas chromatog- raphy method. Fundamental equations of oxygen permeation and transport resistance through mixed conducting membrane were developed. The oxygen bulk diffusion coefficient (Dv) and surface exchange coefficient (Kex) for LSC membrane were derived by model regression. The importance ofsurface exchange kinetics at each side ofthe membrane on oxygen permeation flux under different oxygen partial pressure gradients and temperatures were quantitatively distinguished from the oxygen bulk diffusion. The maximum oxygen flux achieved based on 1.6-mm-thick La0-4Sr 0-6CoO3-s membrane was ∼4.0 × 10-7 mol cm-2 s-1at 950°C. However, calculation results show theoretical oxygen fluxes as high as 2.98 × 10--5 mol cm-2 s-1 through a 5-/im-thick LSC membrane with ideal surface modification when operating at 950°C for air separation.


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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: 08 Aug 2019 05:12
Last Modified: 09 Aug 2019 05:19
Uncontrolled Keywords: La0.4Sr0.6CoO3-d, ceramic membrane, oxygen separation, rate determination
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 > 8606 Industrial Chemicals and Related Products > 860601 Industrial Gases
B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics
Identification Number or DOI: 10.1002/aic.11857
URI: http://eprints.usq.edu.au/id/eprint/36474

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