Date
2018
Abstract
Highly selective separation and/or purification of acetylene from various gas mixtures is a relevant and difficult challenge which currently requires costly and energy intensive chemisorption processes. Herein, we demonstrate that two ultramicroporous metalorganic framework physisorbents, NKMOF-1-M (M = Cu or Ni), offer high hydrolytic stability and benchmark selectivity towards acetylene vs. several gases at ambient temperature. We attribute the performance of NKMOF-1-M to their exceptional acetylene binding affinity as revealed by modeling and several experimental studies: in situ single crystal X-ray diffraction and FT-IR; gas mixture breakthrough tests. NKMOF-1-M exhibit better low pressure uptake than existing physisorbents and possesses the highest selectivities yet reported for C2H2/CO2 and C2H2/CH4. This study introduces a new strategy for the design of porous materials for acetylene separation since the performance of NKMOF-1-M is not driven by the same mechanism as current benchmark physisorbents that rely on pore walls lined by inorganic anions.
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Description
peer-reviewed
Publisher
John Wiley & Sons, Inc.
Citation
Angewandte Chemie International Edition;57 (34), pp. 10971-10975
Collections
Bernal Institute
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Keywords
metal-organic frameworks, ultramicroporous materials, acetylene separation, gas breakthrough, acetylene binding site, hydrolytic stability
ULRR Identifiers
https://hdl.handle.net/10344/7081
 https://doi.org/10.34961/4791
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Funding Information
Science Foundation Ireland (SFI), National Natural Science Foundation of China, National Science Foundation
Sustainable Development Goals
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