Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation and Oxygen Permeability of Nb-doped BCFN Ceramic Membrane

Nb-doped BCFN 세라믹 막의 제조 및 산소투과 특성

  • Kim, Jong-Pyo (Department of Chemical Engineering, Chungnam National University) ;
  • Son, Sou-Hwan (Greenhouse Gas Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research) ;
  • Park, Jung-Hoon (Greenhouse Gas Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research) ;
  • Lee, Yong-Taek (Department of Chemical Engineering, Chungnam National University)
  • 김종표 (충남대학교 화학공학과) ;
  • 손수환 (한국에너지기술연구원 온실가스연구단) ;
  • 박정훈 (한국에너지기술연구원 온실가스연구단) ;
  • 이용택 (충남대학교 화학공학과)
  • Received : 2011.01.11
  • Accepted : 2011.03.12
  • Published : 2011.03.30
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Abstract

$BaCo_{0.7}Fe_{0.22}Nb_{0.08}O_{3-{\delta}}$ oxide was synthesized by solid state reaction method. Dense ceramic membrane was prepared using as-prepared powder by pressing and sintering at $1,200^{\circ}C$. XRD result of membrane showed single perovskite structure. Leakage and oxygen permeation test were conducted on the membrane sealed by glass ring as a sealing material. The oxygen permeation flux increased with increasing temperature and pressure difference and maximum oxygen permeation flux was $2.3mL/min{\cdot}cm^2$ at $950^{\circ}C$ with $Po_2$ = 0.63 atm of oxygen partial pressure. The oxygen permeation in the condition of air with $CO_2$ (300 ppm) as feed stream decreased as much as only maximum 2.9% in comparison with air feed stream. It indicated $BaCo_{0.7}Fe_{0.22}Nb_{0.08}O_{3-{\delta}}$ membrane is more stable than another membrane for carbon dioxide.

고상반응법을 이용하여 $BaCo_{0.7}Fe_{0.22}Nb_{0.08}O_{3-{\delta}}$ (BCFN) 조성의 산화물을 합성하였으며, 합성된 분말은 압축 성형 후 $1,200^{\circ}C$에서 소결하여 치밀한 세라믹 분리막을 제조하였다. 제조된 $BaCo_{0.7}Fe_{0.22}Nb_{0.08}O_{3-{\delta}}$ 분리막의 XRD 분석결과 단일상의 페롭스카이트 구조를 보였다. 밀봉재료로 glass ring을 사용하여 가스누출 실험 및 산소투과 분석을 하였으며, 산소투과 분석 결과 온도와 산소분압($Po_2$)이 증가할수록 산소투과량은 증가하였고, $Po_2$ = 0.63 atm의 경우 $950^{\circ}C$에서 $2.3mL/min{\cdot}cm^2$의 값을 나타내었다. 또한, 이산화탄소 300 ppm이 포함된 혼합공기를 사용할 경우 모사공기($Po_2$ = 0.21 atm)를 사용한 경우에 비해 산소투과량이 최대 2.9%만 감소하였다. 이는 $BaCo_{0.7}Fe_{0.22}Nb_{0.08}O_{3-{\delta}}$ 분리막이 다른 분리막에 비해 이산화탄소에 대해 안정하다는 것을 의미한다.

Keywords

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