Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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A Simultaneous Improvement in $CO_2$ Flux and $CO_2/N_2$ Separation Factor of Sodium-type FAU Zeolite Membranes through 13X Zeolite Beads Embedding

13X 제올라이트 흡착제 충진에 의한 Na형 Faujasite 제올라이트 분리막의 $CO_2/N_2$ 선택도 및 $CO_2$ 투과도 동시 증가 현상

  • Cho, Churl-Hee (Nano Materials Research Center, Korea Institute of Energy Research) ;
  • Yeo, Jeong-Gu (Nano Materials Research Center, Korea Institute of Energy Research) ;
  • Ahn, Young-Soo (Nano Materials Research Center, Korea Institute of Energy Research) ;
  • Han, Moon-Hee (Nano Materials Research Center, Korea Institute of Energy Research) ;
  • Moon, Jong-Ho (Department of Chemical Engineering, Yonsei University) ;
  • Lee, Chang-Ha (Department of Chemical Engineering, Yonsei University)
  • 조철희 (한국에너지기술연구원 나노소재연구센터) ;
  • 여정구 (한국에너지기술연구원 나노소재연구센터) ;
  • 안영수 (한국에너지기술연구원 나노소재연구센터) ;
  • 한문희 (한국에너지기술연구원 나노소재연구센터) ;
  • 문종호 (연세대학교 화학공학과) ;
  • 이창하 (연세대학교 화학공학과)
  • Published : 2007.09.30
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Abstract

Sodium type faujasite(FAU) zeolite membranes with a thickness of 5${\mu}m$ and a Si/Al molar ratio of 1.5 were prepared by the secondary growth process. The $CO_2/N_2$ separation in the vacuum mode was investigated at $30^{\circ}C$ for an equimolar $CO_2-N_2$ mixed gas before and after embedding 13X zeolite beads in the permeate side. The embedded 13X zeolite beads improved both $CO_2$ permeance and $CO_2/N_2$ separation factor, simultaneously. The phenomenon was explained by an increment in the $CO_2$ desorption rate at the FAU zeolite/$\alpha-Al_2O_3$ phase boundary due to an enhanced $CO_2$ escaping through the pore channels of the $\alpha-Al_2O_3$ support layer. In the present paper, it will be emphasized that a hybridization of a membrane with an adsorbent can provide a key to break through the trade-off between permeance and separation factor, generally shown in a membrane separation.

분리층 두께가 5${\mu}m$이며 Si/Al 몰비가 1.5인 Na형 faujasite 제올라이트 분리막을 이차성장 공정에 의하여 제조하였고, 투과부에 13X 제올라이트 흡착제 충진 전후의 진공모드에서의 $CO_2/N_2$ 분리거동을 $CO_2/N_2$ 몰비가 1인 혼합기체에 대하여 $30^{\circ}C$에서 평가하였다. 충진된 13X 제올라이트 흡착제는 $CO_2$ 투과도와 $CO_2/N_2$ 선택도를 동시에 증진시켰다. 이 현상은 13X 제올라이트 흡착제 충진이 다공성 $\alpha$-알루미나 지지체의 기공채널을 통한 $CO_2$ 탈출을 증진시킴으로써 faujasite 제올라이트/$\alpha$-알루미나 상계면에서의 $CO_2$ 탈착을 증진시켰기 때문으로 설명되었다. 본 논문으로부터 흡착제와 분리막의 혼성화는 일반적으로 보여지는 선택도와 투과도의 역비례 관계를 획기적으로 개선할 방법임이 확인되었다.

Keywords

References

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