Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Gas Permeation Characteristics of Silica Membrane Prepared by Ultrasonic Spray Pyrolysis

초음파 분무 열분해법에 의해 합성한 실리카 막의 기체 투과 특성

  • Lee Kew-Ho (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Youn Min-Young (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Park Sang-Jin (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Lee Dong-Wook (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Sea Bongkuk (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology)
  • 이규호 (한국화학연구원 분리막다기능소재연구센터) ;
  • 윤민영 (한국화학연구원 분리막다기능소재연구센터) ;
  • 박상진 (한국화학연구원 분리막다기능소재연구센터) ;
  • 이동욱 (한국화학연구원 분리막다기능소재연구센터) ;
  • 서봉국 (한국화학연구원 분리막다기능소재연구센터)
  • Published : 2005.06.01
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Abstract

Silica membranes were prepared on a porous metal sheet by ultrasonic spray pyrolysis method for gas separation at high temperatures. In order to improve the permselectivity, silica was deposited in the sol-gel derived $silica/\gamma-alumina$ intermediate layer by pyrolysis of tetraethyl orthosilicate (TEOS) at 873 K. The pyrolysis with forced cross flow through the porous wall of the support was very effective in plugging mesopores, Knudsen diffusion regime, that were left unplugged in the membranes. At permeation temperature of 523 K, the silica/alumina composite membrane showed $H_2/N_2$ and water/methanol selectivity as high as 17 and 16, respectively, by molecular sieve effect.

표면 개질한 다공성 금속 지지체에 초음파 분무 열분해법을 이용하여 silica막을 합성하고, 고온 기체 선택 투과 분리 특성을 조사하였다. Tetraethyl orthosilicate (TEOS)를 전구체로 하여 지지체 세공을 통한 감압 진공을 하면서 873K에서 표면에 defect 없이 균일한 양질의 silica막이 형성되었다. 투과 온도 523 K에서 silica막의 수th/질소 및 수증기/메탄을 분리 계수가 각각 17 및 16 정도의 우수한 선택 투과 성능을 나타냈다. 다공성 금속 지지체의 불균일한 기공에 silica 분체 및 $\gamma-alumina$층을 중간층으로 도입하고, 그 위에 열분해법에 의한 silica를 합성한 결과, Knudsen 확산에 의한 투과 영역의 세공이 완전히 제거되어 높은 수소 및 수증기 선택성을 가지는 복합 막이 형성되었다.

Keywords

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