Premium
A Series of Mesoporous Metal‐Organic Frameworks with Tunable Windows Sizes and Exceptionally High Ethane over Ethylene Adsorption Selectivity
Author(s) -
Lysova Anna A.,
Samsonenko Denis G.,
Kovalenko Konstantin A.,
Nizovtsev Anton S.,
Dybtsev Danil N.,
Fedin Vladimir P.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202008132
Subject(s) - ethylene glycol , adsorption , selectivity , chemistry , mesoporous material , ethylene , metal organic framework , inorganic chemistry , organic chemistry , chemical engineering , catalysis , engineering
The NIIC‐20 (NIIC stands for Nikolaev Institute of Inorganic Chemistry) is a family of five isostructural metal‐organic frameworks (MOFs) based on dodecanuclear wheel‐shaped carboxylate building blocks {Zn 12 (RCOO) 12 (glycol) 6 } (glycol is deprotonated diatomic alcohol: ethylene glycol, 1,2‐propanediol, 1,2‐butanediol, 1,2‐pentanediol or glycerol), quantitatively crystallized from readily available starting chemicals. The crystal structures contain large mesoporous cages of 25 Å connected through {Zn 12 } rings, of which inner diameter and chemical nature depend solely on the chosen glycol. The NIIC‐20 compounds feature high surface area and rarely observed inversed adsorption affinity for saturated hydrocarbon (ethane) over the unsaturated ones (ethylene, acetylene). The corresponding IAST (Ideal Adsorbed Solution Theory) adsorption selectivity factors reach as much as 15.4 for C 2 H 6 /C 2 H 4 and 10.9 for C 2 H 6 /C 2 H 2 gas mixtures at ambient conditions, exceeding those for any other porous MOF reported so far. The remarkable combination of high adsorption uptakes and high adsorption selectivities makes the NIIC‐20 series a new benchmark of porous materials designed for ethylene separation applications.