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Selective Capture of Carbon Dioxide under Humid Conditions by Hydrophobic Chabazite‐Type Zeolitic Imidazolate Frameworks
Author(s) -
Nguyen Nhung T. T.,
Furukawa Hiroyasu,
Gándara Felipe,
Nguyen Hoang T.,
Cordova Kyle E.,
Yaghi Omar M.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201403980
Subject(s) - zeolitic imidazolate framework , chabazite , chemistry , adsorption , zinc nitrate , imidazolate , porosity , chemical engineering , metal organic framework , inorganic chemistry , zinc , organic chemistry , zeolite , catalysis , engineering
Hydrophobic zeolitic imidazolate frameworks (ZIFs) with the chabazite ( CHA ) topology are synthesized by incorporating two distinct imidazolate links. Zn(2‐mIm) 0.86 (bbIm) 1.14 (ZIF‐300), Zn(2‐mIm) 0.94 (cbIm) 1.06 (ZIF‐301), and Zn(2‐mIm) 0.67 (mbIm) 1.33 (ZIF‐302), where 2‐mIm=2‐methylimidazolate, bbIm=5(6)‐bromobenzimidazolate, cbIm=5(6)‐chlorobenzimidazolate, and mbIm=5(6)‐methylbenzimidazolate, were prepared by reacting zinc nitrate tetrahydrate and 2‐mIm with the respective bIm link in a mixture of N , N ‐dimethylformamide (DMF) and water. Their structures were determined by single‐crystal X‐ray diffraction and their permanent porosity shown. All of these structures are hydrophobic as confirmed by water adsorption isotherms. All three ZIFs are equally effective at the dynamic separation of CO 2 from N 2 under both dry and humid conditions without any loss of performance over three cycles and can be regenerated simply by using a N 2 flow at ambient temperature.