| Issue |
Korean Chemical Engineering Research,
Vol.49, No.6, 804-809, 2011
Vol.49, No.6, 804-809, 2011
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
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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