Investigation of carbonates in oxygen-transporting membrane ceramics

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Original languageEnglish
Pages (from-to)31-38
Number of pages8
JournalJournal of membrane science
Volume480
Early online date2 Feb 2015
Publication statusPublished - 5 Apr 2015

Abstract

The performance of perovskite-type oxygen-transporting membranes during CO2 sweeping has been investigated. The series of La1-xSr xCo0.8Fe0.2O3-δ (LSCF) materials with x=1, 0.8, 0.6 and 0.4 (SCF, LSCF2882, LSCF4682, LSCF6482) were synthesized by the sol-gel method and characterized by X-ray diffraction (XRD). To investigate the poisoning effect of CO2 on the phase composition and microstructure of the membranes after long-term oxygen permeation experiments (more than 200h) at 1173K under a CO2 atmosphere, transmission electron microscopy (TEM) investigations were carried out. Electron-energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDXS) revealed the formation of carbonate at the outer surface of the LSCF materials with low lanthanum content, which correlates with a decrease in oxygen permeation flux. Nevertheless, the LSCF 6482 material is tolerant to CO2 gas. No carbonate layer was found after 200h of operation, and the oxygen flux remained stable.

Keywords

    Carbonate formation, Electron-energy loss spectroscopy, Long-term oxygen permeation, Oxygen-transporting membrane, Transmission electron microscopy

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Investigation of carbonates in oxygen-transporting membrane ceramics. / Ravkina, Olga; Klande, Tobias; Feldhoff, Armin.
In: Journal of membrane science, Vol. 480, 05.04.2015, p. 31-38.

Research output: Contribution to journal › Article › Research › peer review

Ravkina O, Klande T, Feldhoff A. Investigation of carbonates in oxygen-transporting membrane ceramics. Journal of membrane science. 2015 Apr 5;480:31-38. Epub 2015 Feb 2. doi: 10.1016/j.memsci.2015.01.042
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T1 - Investigation of carbonates in oxygen-transporting membrane ceramics

AU - Ravkina, Olga

AU - Klande, Tobias

AU - Feldhoff, Armin

N1 - Funding Information: The authors sincerely acknowledge financial support from the Chinese-German Center for Science ( GZ676 ) and the Deutsche Forschungsgemeinschaft ( FE 928/4-1 ) as well as fruitful discussions with Prof. Jürgen Caro. Publisher Copyright: © 2015 Elsevier B.V.

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N2 - The performance of perovskite-type oxygen-transporting membranes during CO2 sweeping has been investigated. The series of La1-xSr xCo0.8Fe0.2O3-δ (LSCF) materials with x=1, 0.8, 0.6 and 0.4 (SCF, LSCF2882, LSCF4682, LSCF6482) were synthesized by the sol-gel method and characterized by X-ray diffraction (XRD). To investigate the poisoning effect of CO2 on the phase composition and microstructure of the membranes after long-term oxygen permeation experiments (more than 200h) at 1173K under a CO2 atmosphere, transmission electron microscopy (TEM) investigations were carried out. Electron-energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDXS) revealed the formation of carbonate at the outer surface of the LSCF materials with low lanthanum content, which correlates with a decrease in oxygen permeation flux. Nevertheless, the LSCF 6482 material is tolerant to CO2 gas. No carbonate layer was found after 200h of operation, and the oxygen flux remained stable.

AB - The performance of perovskite-type oxygen-transporting membranes during CO2 sweeping has been investigated. The series of La1-xSr xCo0.8Fe0.2O3-δ (LSCF) materials with x=1, 0.8, 0.6 and 0.4 (SCF, LSCF2882, LSCF4682, LSCF6482) were synthesized by the sol-gel method and characterized by X-ray diffraction (XRD). To investigate the poisoning effect of CO2 on the phase composition and microstructure of the membranes after long-term oxygen permeation experiments (more than 200h) at 1173K under a CO2 atmosphere, transmission electron microscopy (TEM) investigations were carried out. Electron-energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDXS) revealed the formation of carbonate at the outer surface of the LSCF materials with low lanthanum content, which correlates with a decrease in oxygen permeation flux. Nevertheless, the LSCF 6482 material is tolerant to CO2 gas. No carbonate layer was found after 200h of operation, and the oxygen flux remained stable.

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