Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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$CO_2$ Separation Using Surface Modified Silica Membrane

표면개질 실리카막을 이용한 $CO_2$선택투과분리

  • 김성수 (부산카톨릭대학교 산업환경시스템학부) ;
  • 최현교 (부산대학교 무기재료공학과) ;
  • 박홍채 (부산대학교 무기재료공학과) ;
  • 김태옥 (부산대학교 무기재료공학과) ;
  • 서봉국 (동경대학 화학시스템공학과)
  • Published : 2000.08.01
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Abstract

To improve $CO_2$pemselectivity, a modified silica membrane was prepared by chemical vapor deposition with tetraethoxysilane(TEOS)-ethanol-water, and TEOS-ethanol-water-HCI solution at 300-$600^{\circ}C$. The silica was effectively deposited in the mesopores of a ${\gamma}$-alumina film coated on a porous $\alpha$-alumina tube by evacuating the reactants through the porous wall. In this membrane, $CO_2$interacts, to some extent, with the pore wall, and $CO_2$/$N_2$selectivity then exceeds the value of the Knudsen diffusion mechanism, while the membrane derived from TEOS alone has no $CO_2$selectivity. The silica membrane prepared from TEOS-ethanol-water-HCI solution showed that $CO_2$permeance was $2.5$\times$10^{-7}mol/s^{-1}.m^{-2}.Pa^{-1} at 30{\circ}C$ and $CO_2$/$N_2$selectivity was approximately 3. The $CO_2$permeance and selectivity was improved by enlarging the surface diffusion with modification of chemical affinity of the silica pores.

Keywords

References

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