Oxygen Permeation and Stability Study of (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ Membranes

Alternative title; Oxygen permeation and stability study of (La0.6Ca0.4)(0.98)(Co0.8Fe0.2)O3-delta membranes

Mehdi Salehi, Martin Søgaard, Vincenzo Esposito, Søren Preben Vagn Foghmoes, E. S. Persoon, M. Schroeder, Peter Vang Hendriksen

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The perovskite-type oxide (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ (LCCF) was investigated for use as oxygen separation membrane. A 25 µm thick dense membrane on a porous LCCF support with a thickness of around 175 µm was prepared by a tape casting and lamination process. The optimum sintering temperature of the component was established to be 1050 °C by analysis of microstructures of membranes sintered at different temperatures. Scanning electron microscopy (SEM) examination of cross-sections of the sintered membrane showed that it consisted of two phases, the main phase being enriched in calcium (Ca) and depleted in lanthanum (La), relative to the nominal composition. A surface activation layer of LCCF was deposited onto the dense layer to increase the exchange rate of oxygen at the surface. For the coated membrane, the oxygen permeation flux increased with temperature and reached a maximum value of 3.32 Nml cm−2 min−1 at 900 °C when, for characterization purpose pure oxygen was used as feed and a maximum value of 2.06 Nml cm−2 min−1 at 900 °C was obtained when air was used at the feed side, both with N2 sweep on the permeate side. The stability of the membrane against sulfur dioxide (SO2) and pure carbon dioxide (CO2) was tested. A small decrease in the flux was observed over 48 h in CO2 at 850 °C. SEM examinations of the cross-section of the tested membrane showed that the Ca rich phase in the membrane showed a tendency to migrate to the feed side. Whereas the material shows a CO2 stability superior to that of Sr or Ba containing analogues, the material stability is not sufficient for applications requiring direct exposure to sulfur-rich flue gases.
Original languageEnglish
JournalJournal of Membrane Science
Volume542
Pages (from-to)245-253
ISSN0376-7388
DOIs
Publication statusPublished - 2017

Keywords

  • Oxygen permeation membrane
  • Kinetic demixing
  • Stability
  • Oxy-fuel

Cite this

@article{a6206ccf388d4ab290ec13ea6e3101f6,
title = "Oxygen Permeation and Stability Study of (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ Membranes: Alternative title; Oxygen permeation and stability study of (La0.6Ca0.4)(0.98)(Co0.8Fe0.2)O3-delta membranes",
abstract = "The perovskite-type oxide (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ (LCCF) was investigated for use as oxygen separation membrane. A 25 µm thick dense membrane on a porous LCCF support with a thickness of around 175 µm was prepared by a tape casting and lamination process. The optimum sintering temperature of the component was established to be 1050 °C by analysis of microstructures of membranes sintered at different temperatures. Scanning electron microscopy (SEM) examination of cross-sections of the sintered membrane showed that it consisted of two phases, the main phase being enriched in calcium (Ca) and depleted in lanthanum (La), relative to the nominal composition. A surface activation layer of LCCF was deposited onto the dense layer to increase the exchange rate of oxygen at the surface. For the coated membrane, the oxygen permeation flux increased with temperature and reached a maximum value of 3.32 Nml cm−2 min−1 at 900 °C when, for characterization purpose pure oxygen was used as feed and a maximum value of 2.06 Nml cm−2 min−1 at 900 °C was obtained when air was used at the feed side, both with N2 sweep on the permeate side. The stability of the membrane against sulfur dioxide (SO2) and pure carbon dioxide (CO2) was tested. A small decrease in the flux was observed over 48 h in CO2 at 850 °C. SEM examinations of the cross-section of the tested membrane showed that the Ca rich phase in the membrane showed a tendency to migrate to the feed side. Whereas the material shows a CO2 stability superior to that of Sr or Ba containing analogues, the material stability is not sufficient for applications requiring direct exposure to sulfur-rich flue gases.",
keywords = "Oxygen permeation membrane, Kinetic demixing, Stability, Oxy-fuel",
author = "Mehdi Salehi and Martin S{\o}gaard and Vincenzo Esposito and Foghmoes, {S{\o}ren Preben Vagn} and Persoon, {E. S.} and M. Schroeder and Hendriksen, {Peter Vang}",
year = "2017",
doi = "10.1016/j.memsci.2017.07.050",
language = "English",
volume = "542",
pages = "245--253",
journal = "Journal of Membrane Science",
issn = "0376-7388",
publisher = "Elsevier",

}

Oxygen Permeation and Stability Study of (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ Membranes : Alternative title; Oxygen permeation and stability study of (La0.6Ca0.4)(0.98)(Co0.8Fe0.2)O3-delta membranes. / Salehi, Mehdi; Søgaard, Martin; Esposito, Vincenzo; Foghmoes, Søren Preben Vagn; Persoon, E. S.; Schroeder, M.; Hendriksen, Peter Vang.

In: Journal of Membrane Science, Vol. 542, 2017, p. 245-253.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Oxygen Permeation and Stability Study of (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ Membranes

T2 - Alternative title; Oxygen permeation and stability study of (La0.6Ca0.4)(0.98)(Co0.8Fe0.2)O3-delta membranes

AU - Salehi, Mehdi

AU - Søgaard, Martin

AU - Esposito, Vincenzo

AU - Foghmoes, Søren Preben Vagn

AU - Persoon, E. S.

AU - Schroeder, M.

AU - Hendriksen, Peter Vang

PY - 2017

Y1 - 2017

N2 - The perovskite-type oxide (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ (LCCF) was investigated for use as oxygen separation membrane. A 25 µm thick dense membrane on a porous LCCF support with a thickness of around 175 µm was prepared by a tape casting and lamination process. The optimum sintering temperature of the component was established to be 1050 °C by analysis of microstructures of membranes sintered at different temperatures. Scanning electron microscopy (SEM) examination of cross-sections of the sintered membrane showed that it consisted of two phases, the main phase being enriched in calcium (Ca) and depleted in lanthanum (La), relative to the nominal composition. A surface activation layer of LCCF was deposited onto the dense layer to increase the exchange rate of oxygen at the surface. For the coated membrane, the oxygen permeation flux increased with temperature and reached a maximum value of 3.32 Nml cm−2 min−1 at 900 °C when, for characterization purpose pure oxygen was used as feed and a maximum value of 2.06 Nml cm−2 min−1 at 900 °C was obtained when air was used at the feed side, both with N2 sweep on the permeate side. The stability of the membrane against sulfur dioxide (SO2) and pure carbon dioxide (CO2) was tested. A small decrease in the flux was observed over 48 h in CO2 at 850 °C. SEM examinations of the cross-section of the tested membrane showed that the Ca rich phase in the membrane showed a tendency to migrate to the feed side. Whereas the material shows a CO2 stability superior to that of Sr or Ba containing analogues, the material stability is not sufficient for applications requiring direct exposure to sulfur-rich flue gases.

AB - The perovskite-type oxide (La0.6Ca0.4)0.98(Co0.8Fe0.2)O3-δ (LCCF) was investigated for use as oxygen separation membrane. A 25 µm thick dense membrane on a porous LCCF support with a thickness of around 175 µm was prepared by a tape casting and lamination process. The optimum sintering temperature of the component was established to be 1050 °C by analysis of microstructures of membranes sintered at different temperatures. Scanning electron microscopy (SEM) examination of cross-sections of the sintered membrane showed that it consisted of two phases, the main phase being enriched in calcium (Ca) and depleted in lanthanum (La), relative to the nominal composition. A surface activation layer of LCCF was deposited onto the dense layer to increase the exchange rate of oxygen at the surface. For the coated membrane, the oxygen permeation flux increased with temperature and reached a maximum value of 3.32 Nml cm−2 min−1 at 900 °C when, for characterization purpose pure oxygen was used as feed and a maximum value of 2.06 Nml cm−2 min−1 at 900 °C was obtained when air was used at the feed side, both with N2 sweep on the permeate side. The stability of the membrane against sulfur dioxide (SO2) and pure carbon dioxide (CO2) was tested. A small decrease in the flux was observed over 48 h in CO2 at 850 °C. SEM examinations of the cross-section of the tested membrane showed that the Ca rich phase in the membrane showed a tendency to migrate to the feed side. Whereas the material shows a CO2 stability superior to that of Sr or Ba containing analogues, the material stability is not sufficient for applications requiring direct exposure to sulfur-rich flue gases.

KW - Oxygen permeation membrane

KW - Kinetic demixing

KW - Stability

KW - Oxy-fuel

U2 - 10.1016/j.memsci.2017.07.050

DO - 10.1016/j.memsci.2017.07.050

M3 - Journal article

VL - 542

SP - 245

EP - 253

JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

ER -