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NTIS 바로가기멤브레인 = Membrane Journal, v.29 no.4, 2019년, pp.202 - 215
김동훈 (전남대학교 화학공학부)
Molecular sieve membranes separate molecules based on their size and/or shape and have been of high interest, due to their potentially high energy efficiency and high selectivity. Zeolite MFI membrane is one of the most-studied molecular sieve membranes and has affected following studies on other mo...
핵심어 | 질문 | 논문에서 추출한 답변 |
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분자체 물질이란 무엇인가? | 분자체 물질은 분자수준의 기공크기를 갖는 다공성 물질로서, 기공보다 큰 분자를 효과적으로 배제한다. 이 특성을 기반으로, 촉매반응, 저장, 그리고 분리 등, 화학 산업에서 다방면으로 응용되었다[1]. | |
현재 제올라이트 분리막이 갖는 한계는 무엇인가? | 분리막의 성능은 보통 투과도(permeance)와 선택도(separation factor)로 나타내는데, 투과도는 분자들의 분리막을 통과하는 최단거리인 분리막의 두께에 크게 영향을 받는다. 제올라이트 분리막의 경우 생산 단가가 매우 높기 때문에($5,000~10,0000 per m2), 현재의 상용분리 공정 대비 경쟁력이 생기려면 50 nm 이하로 제작되어야 한다고 Tsapatsis가 제안하였다[8]. | |
분자체 분리막의 기공 크기 조절이 어려운 이유는 무엇인가? | 분자체 분리막은 크기 기반의 물리적 분리방법이기 때문에 기공의 크기 조절이 매우 중요하다. 범용 분리기술로 분리하기 어려운 혼합물을 분리하기 위해서는 기공 크기가 나노미터 이하의 정확도로 조절되어야 하는데, 이를 위한 기공의 크기를 높은 정밀도로 재현성 있게 조절하는 기술은 구현하기가 매우 어렵다. 반면, 제올라이트나 metal-organic framework 등의 결정형 다공성 물질들은 아주 균일한 기공을 갖고 있기 때문에 상대적으로 쉽게 높은 선택도를 달성할 수 있다. |
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