Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Secondary Growth of Sodium Type Faujasite Zeolite Layers on a Porous $\alpha-Al_2O_3$ Tube and the $CO_2/N_2$ Separation

Na형 Faujasite 제올라이트 분리막 형성 및 $CO_2/N_2$ 분리

  • 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) ;
  • Kim, Yong-Ha (Department of Chemical Engineering, Bukyung National University) ;
  • Hyun, Sang-Hoon (Department of Ceramic Engineering, Yonsei University)
  • 조철희 (한국에너지기술연구원 나노소재연구센터) ;
  • 여정구 (한국에너지기술연구원 나노소재연구센터) ;
  • 안영수 (한국에너지기술연구원 나노소재연구센터) ;
  • 한문희 (한국에너지기술연구원 나노소재연구센터) ;
  • 김용하 (부경대학교 화학공학과) ;
  • 현상훈 (연세대학교 세라믹공학과)
  • Published : 2007.09.30
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Abstract

Sodium type faujasite(FAU) zeolite layers with diverse materials characteristics(Si/Al ratio, thickness, and structural discontinuity) were hydrothermally grown on a porous $\alpha-Al_2O_3$ tube, and then the $CO_2/N_2$ separation was evaluated at $30^{\circ}C$ for an equimolar mixture of $CO_2$ and $N_2$. Among hydrothermal conditions, $SiO_2$ content in hydrothermal solution seriously affected materials characteristics: with an increment in the $SiO_2$ content, Si/Al ratio, thickness, and structural discontinuity of grown FAU zeolite layer simultaneously increased. The present study reveals that structural discontinuity(intercrystalline voids due to an incomplete densification and cracks induced by GIS Na-P1 phase) is the most important variable affecting the $CO_2/N_2$ separation. Also, it was suggested that the $CO_2$ desorption in permeate side be the rate-determining(slowest) step in the overall $CO_2$ permeation.

다양한 재료특성(Si/Al 몰비, 두께, 구조적 불완전성)을 갖는 Na형 faujasite 제올라이트 분리층을 다공성 $\alpha$-알루미나 튜브 표면에 수열조건에서 이차성장 시키고 $CO_2/N_2$ 분리거동을 $CO_2/N_2$ 몰비가 1인 혼합기체에 대하여 $30^{\circ}C$에서 평가하였다. 수열조건 중에서 수열용액 내의 $SiO_2$ 양은 형성된 제올라이트 분리층의 재료특성에 가장 큰 영향을 주는 변수임을 확인하였다. 즉, 수열용액 내의 $SiO_2$ 양이 증가함에 따라서 형성된 제올라이트 분리층의 Si/Al 몰비, 두께, 구조적 불완전성(discontinuity)은 동시에 증가하였다. 본 논문에서는 불완전한 치밀화에 의해 잔존하는 결정립간 공극(void), GIS Na-P1 상에 의해 형성된 균열(crack) 등 구조적 불완전성이 $CO_2/N_2$ 분리에 가장 큰 영향을 주는 재료특성이며, 투과부에서의 $CO_2$ 탈착이 전체 $CO_2$ 투과의 율속단계(rate-determining step)임을 확인하였다.

Keywords

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