화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.60, 279-285, April, 2018
DOI10.1016/j.jiec.2017.11.014  Export Citation
High performance composite membranes comprising Zn(pyrz)2(SiF6) nanocrystals for CO2/CH4 separation
Heqing Gong1, Chong Yang Chuah1, Yanqin Yang2, and Tae-Hyun Bae1, 2, †
  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
  • 2Singapore Membrane Technology Center, Nanyang Technological University, Singapore 637141, Singapore
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Nanocsrystals of Zn(pyrz)2(SiF6) (or SIFSIX-3-Zn) metal-organic framework were synthesized by a facile sonochemical means and incorporated into a polyimide membrane to realize an excellent CO2/CH4 separation performance. Zn(pyrz)2(SiF6) nanocrystals selectively took up a large amount of CO2 even at low pressure while negligible uptake was observed for CH4. This implies that Zn(pyrz)2(SiF6) is an ideal filler to improve CO2/CH4 separation performance of polymer membrane via selective transport of CO2 over CH4. Subsequently, high-quality mixed-matrix membranes that are free of filler/polymer interfacial voids were successfully fabricated by employing house-made polyimide as a polymer matrix. Binary CO2/CH4 mixture gas permeation tests revealed that both CO2 permeability and CO2/CH4 selectivity of mixed-matrix membranes, especially for the membrane with 20 wt% filler loading, were significantly improved compared to those of pure polymeric membrane owing to the selective CO2 uptake and transport by Zn(pyrz)2(SiF6) crystals. As a result, a high performance surpassing the upper bound limit for polymeric membranes was achieved.
Keywords:Mixed-matrix membrane;Metal-organic framework;CO2 capture;Biogas;Polyimide
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