Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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A study on permeation of $CO_2-N_2-O_2$ mixed gases through a NaY zeolite membrane under permeate evacuation mode

진공모드에서 NaY 제올라이트 막의 $CO_2-N_2-O_2$ 혼합기체의 투과거동 연구

  • Jeong, Su Jung (Graduate School of Green Energy Technology, Chungnam National University) ;
  • Yeo, Jeong-Gu (Energy Materials and Convergence Research Department, Korea Institute of Energy Research) ;
  • Han, Moon Hee (Graduate School of Green Energy Technology, Chungnam National University) ;
  • Cho, Churl Hee (Graduate School of Green Energy Technology, Chungnam National University)
  • 정수정 (충남대학교 녹색에너지기술전문대학원) ;
  • 여정구 (한국에너지기술연구원 에너지융합소재연구단) ;
  • 한문희 (충남대학교 녹색에너지기술전문대학원) ;
  • 조철희 (충남대학교 녹색에너지기술전문대학원)
  • Received : 2013.10.03
  • Accepted : 2013.10.09
  • Published : 2013.10.31
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Abstract

In the present study, $CO_2$ permeation through a hydrophilic NaY zeolite membrane was studied under permeate evacuation mode for $CO_2$ single gas, $CO_2-N_2$ and $CO_2-O_2$ binary mixtures, and $CO_2-N_2-O_2$ ternary mixture. It was reconfirmed that the $CO_2$ permeation was governed by surface diffusion and the $CO_2$ selectivity was induced from blocking effect of adsorbed $CO_2$ molecules. The $CO_2$ permeance measured in permeate evacuation mode was much lower than that done in He sweeping mode, but was comparable to that obtained under feed pressurization mode. The NaY zeolite membrane showed a considerable $CO_2$ separation for $14%CO_2-80%N_2-6%O_2$ mixture : $CO_2$ permeance was about $1{\times}10^{-7}mol/m^2secPa$ and $CO_2$ selectivity was more than 10. Therefore, it was concluded that NaY zeolite membrane was one of promising membranes for post-combustion CCS process.

본 연구에서는 친수성 NaY 제올라이트 분리막의 단일기체, 이성분계 및 삼성분계 혼합기체에서의 $CO_2$ 투과거동에 대하여 고찰하였다. 분리막을 통한 $CO_2$ 투과는 표면확산에 의해 지배되며 $CO_2$ 분리는 흡착된 $CO_2$ 분자에 의한 blocking 효과에 의해 나타남을 재확인하였다. 진공모드에서 얻어진 $CO_2$ 투과도는 He sweeping 모드에서 얻어진 값보다 작았지만 가압모드에서 얻어진 $CO_2$ 투과도 값과 유사하였다. 특히, NaY 제올라이트 분리막은 실제 연소배가스 조건과 유사한 $14%CO_2-80%N_2-6%O_2$ 모델기체에 대하여 진공모드에서 $CO_2$ 투과도 약 $1{\times}10^{-7}mol/m^2secPa$, $CO_2$ 선택도 10 이상의 우수한 분리성능을 보였다. 따라서, NaY 제올라이트 분리막은 연소후 이산화탄소 회수용 분리막으로 응용 가능성 있는 소재임을 확인하였다.

Keywords

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