Evaluation of Mixed-Conducting Lanthanum-Strontium-Cobaltite Ceramic Membrane for Oxygen Separation

Ge, L., Shao, Z. P., Zhang, K., Ran, R., Diniz da Costa, J. C. and Liu, S. M. (2009) Evaluation of Mixed-Conducting Lanthanum-Strontium-Cobaltite Ceramic Membrane for Oxygen Separation. AICHE JOURNAL, 55 10: 2603-2613. doi:10.1002/aic.11857

Author Ge, L.
Shao, Z. P.
Zhang, K.
Ran, R.
Diniz da Costa, J. C.
Liu, S. M.
Title Evaluation of Mixed-Conducting Lanthanum-Strontium-Cobaltite Ceramic Membrane for Oxygen Separation
Journal name AICHE JOURNAL   Check publisher's open access policy
ISSN 0001-1541
Publication date 2009-10
Sub-type Article (original research)
DOI 10.1002/aic.11857
Volume 55
Issue 10
Start page 2603
End page 2613
Total pages 11
Place of publication New Jersey, USA
Publisher Wiley Interscience
Collection year 2010
Language eng
Subject C1
859802 Management of Greenhouse Gas Emissions from Electricity Generation
090404 Membrane and Separation Technologies
Abstract In this study, La0.4Sr0.6CoO3-delta (LSC) oxide was synthesized via an EDTA-citrate complexing 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 chromatography method. Fundamental equations of oxygen permeation and transport resistance through mixed conducting membrane were developed. The oxygen bulk diffusion coefficient (D-v) and surface exchange coefficient (K-ex) for LSC membrane were derived by model regression. The importance of surface exchange kinetics at each side of the 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 La0.4Sr0.6CoO3-delta, membrane was similar to 4.0 x 10(-7) Mol cm(-2) s(-1) at 950 degrees C. However, calculation results show theoretical oxygen fluxes as high as 2.98 x 10(-5) Mol cm(-2) s(-1) through a 5-mu m-thick LSC membrane with ideal surface modification when, operating at 950 degrees C for air separation.
Keyword La-0.4-Sr0.6CoO3-delta
ceramic membrane
oxygen separation
rate determination
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 12 Nov 2009, 12:05:40 EST by Mr Andrew Martlew on behalf of School of Chemical Engineering