Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation of Nanoporous Ceramic Membranes by Sol-gel Method and Characterization of Gas Permeation

졸-겔법에 의한 나노기공성 세라믹 막의 제조 및 기체투과 특성

  • Lee, Yong-Taek (Green Energy Center, College of Environment and Applied chemistry Department of Chemical Engineering, Kyung Hee University) ;
  • Choi, Ga-Young (Green Energy Center, College of Environment and Applied chemistry Department of Chemical Engineering, Kyung Hee University) ;
  • Han, Hyuk-Hee (Green Energy Center, College of Environment and Applied chemistry Department of Chemical Engineering, Kyung Hee University)
  • 이용택 (경희대학교 환경.응용화학대학 화학공학과) ;
  • 최가영 (경희대학교 환경.응용화학대학 화학공학과) ;
  • 한혁희 (경희대학교 환경.응용화학대학 화학공학과)
  • Published : 2008.06.30
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Abstract

Nano-porous ceramic membranes was synthesized by the sol-gel method. Gas permeation of hydrogen and nitrogen was determined by single composition gas. Pore size $0.1{\mu}m$ and porosity 32% of flat type ${\alpha}-Al_2O_3$ substrate was manufactured. An intermediate ${\gamma}-Al_2O_3$ layer with pore size of 4 nm was formed by dip-coating. Polymeric silica sol was synthesized by acid catalyzed hydrolysis and condensation of tetra-ethyl-ortho-silicate. Supported membranes on alumina were prepared by dipping and calcining. He, $N_2$ permeation experiments with nanoporous sol-gel modified supported ceramic membranes were peformed to determine the gas transport characteristics. $He/N_2$ permselectivity around $100{\sim}160$ and helium permeation in the order of $10^{-7}mol/m^2{\cdot}s{\cdot}Pa$ were measured in the temperature range of $303{\sim}363K$.

본 연구에서 졸-겔 방법에 의하여 나노 기공을 가지는 세라믹막을 제조하여 단일 조성의 헬륨과 질소를 가지고 기체투과 실험을 수행하였다. 기공 크기 $0.1{\mu}m$, 기공율 32%의 평막형 ${\alpha}-Al_2O_3$ 지지체를 제조하였으며, 지지체를 담지하여 코팅하는 방법으로 4nm의 기공 크기를 가지는 ${\gamma}-Al_2O_3$ 중간층을 제조하였다. 실리카 졸은 TEOS의 산 촉매 가수분해와 축중합반응을 통하여 합성하였다. 막은 딥코팅과 소결과정을 거쳐 제조되었다. 졸-겔 법에 의해 합성된 세라믹 막을 통한 헬륨, 질소 투과 실험은 기체의 투과 특성을 파악하기 위하여 시행하였다. 질소에 대한 헬륨의 선택도는 $100{\sim}160$ 정도였으며 헬륨의 투과도는 $303{\sim}363K$의 온도 범위에서 $10^{-7}mol/m^2{\cdot}s{\cdot}Pa$ 정도였다.

Keywords

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