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Host‐Guest Interaction in Ethylene and Ethane Separation on Zeolitic Imidazolate Frameworks as Revealed by Solid‐State NMR Spectroscopy
Author(s) -
Xiao Yuqing,
Chu Yueying,
Li Shenhui,
Chen Fang,
Gao Wei,
Xu Jun,
Deng Feng
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101779
Subject(s) - zeolitic imidazolate framework , ethylene , adsorption , nuclear magnetic resonance spectroscopy , spectroscopy , metal organic framework , imidazolate , solid state nuclear magnetic resonance , chemistry , selectivity , diffusion , chemical engineering , materials science , organic chemistry , nuclear magnetic resonance , catalysis , thermodynamics , physics , quantum mechanics , engineering
Abstract The separation of ethane/ethylene mixture by using metal‐organic frameworks (MOFs) as adsorbents is strongly associated with the pore size‐sieving effect and the adsorbent‐adsorbate interaction. Herein, solid‐state NMR spectroscopy is utilized to explore the host‐guest interaction and ethane/ethylene separation mechanism on zeolitic imidazolate frameworks (ZIFs). Preferential access to the ZIF‐8 and ZIF‐8‐90 frameworks by ethane compared to ethylene is directly visualized from two‐dimensional 1 H‐ 1 H spin diffusion MAS NMR spectroscopy and further verified by computational density distributions. The 1 H MAS NMR spectroscopy provides an alternative for straightforwardly extracting the adsorption selectivity of ethane/ethylene mixture at 1.1∼9.6 bar in ZIFs, which is consistent with the IAST predictions.