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Received January 25, 2011
Accepted February 18, 2011
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산소분리를 위한 Ba0.5Sr0.5Co0.8Fe0.2O3-δ 관형 분리막 제조 및 투과 특성
Fabrication and Permeation Properties of Tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ Membranes for Oxygen Separation
충남대학교 화학공학과, 305-764 대전시 유성구 대학로 99 1한국에너지기술연구원 온실가스연구단, 305-343 대전시 유성구 가정로 152
Department of Chemical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea 1Greenhouse Gas Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Korea
pjhoon@kier.re.kr
Korean Chemical Engineering Research, December 2011, 49(6), 804-809(6), NONE Epub 28 November 2011
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Abstract
Ba0.5Sr0.5Co0.8Fe0.2O3-δ 조성의 관형 분리막을 압출 성형 방법으로 제조하였다. 압출성형 직후 분리막의 TGA 분석결과 3단계의 무게감소로 첨가제와 탄산염이 분해되었고, 건조 수축율은 68 h 경과 후 변화가 없었으며 외경이 큰 분리막에서 높게 나타났다. 소결 후 분리막의 XRD 및 SEM 분석결과, 분리막은 단일상의 페롭스카이트 구조를 갖는 치밀한 막을 보였고, EDS 분석을 통해 Ba0.5Sr0.5Co0.8Fe0.2O3-δ와 유사한 성분함량을 가짐을 확인하였다. 두께 0.95mm Ba0.5Sr0.5Co0.8Fe0.2O3-δ 관형 분리막의 압환강도(radial crushing strength)는 5.7 kgf/mm2이였으며, 950 ℃에서 산소투과량은 146.85 mL/min(Jo2=2.33 mL/min·cm2)를 나타냈었다. 투과 측의 진공펌프 사용이 쓸개 가스를 활용한 것보다 산소 투과량 증진에 효과가 있음을 알 수 있었다.
Tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes were prepared by extrusion. TGA results of green body membrane after extrusion showed three successive weight losses due to decomposition of organic additives and carbonate. Drying shrinkage rate of tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes was no change after 68 h and higher in the membrane with large outer diameter. XRD and SEM results showed the sintered membranes were the single phase structure and dense. The stoichiometric molar ratio agreed well with composition ratio calculated by EDS results for Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane. Radial crushing strength of tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane with 0.95 mm thickness was 5.7 kgf /mm2 and the oxygen permeation rate of same membrane was 146.85 mL/min (Jo2=2.33 mL/min·cm2) at 950 ℃. Therefore, it was known that use of vacuum pump was more effective than that of sweep gas to obtain higher oxygen permeation flux.
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