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Received February 16, 2011
Accepted June 8, 2011
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Oxygen permeation performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane after surface modification
Greenhouse Gas Research Center, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea 1Chemical Engineering, Chungnam National University, 220, Gung-dong, Yuseong-gu, Daejeon 305-764, Korea
pjhoon@kier.re.kr
Korean Journal of Chemical Engineering, February 2012, 29(2), 235-242(8), 10.1007/s11814-011-0153-y
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Abstract
The effect of minor surface modification on the performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane was evaluated in the temperature region from 700 to 850℃ . Oxygen permeation experiments were conducted according to membrane thickness (1.0mm and 1.6 mm) and oxygen partial pressure (0.21, 0.42, and 0.63 atm) in the absence and in the presence of carbon dioxide (300 and 500 ppm). The oxygen permeation flux of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane increased with increasing temperature and decreasing membrane thickness. The oxygen permeation flux through the membrane of 1.0 mm thickness with Ba0.5Sr0.5Co0.8Fe0.2O3-δ-modified surface was ca. 1.23 ml/cm2·min at 850 ℃ under air feeding condition. It was found that the Ba0.5Sr0.5Co0.8Fe0.2O3-δ-modified Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane has better oxygen permeation flux than the pristine Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane. In summary, it has been demonstrated that the surface morphology is an important factor in determining the oxygen permeation fluxes through Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane under mixed-control conditions.
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