Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 40, Pages 10645-10648Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201403980
Keywords
carbon dioxide; dynamic separation; hydrophobic; metal-organic frameworks; zeolitic imidazolate frameworks
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Funding
- Ministry of Science and Technology (Vietnam) [38/2012/HD-NDT]
- Office of Science, Office of Basic Energy Sciences, of the U.S. DOE [DE-AC02-05CH11231]
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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-methyl-imidazolate, 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 CO2 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.
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