Selective Capture of Carbon Dioxide under Humid Conditions by Hydrophobic Chabazite‐Type Zeolitic Imidazolate Frameworks |
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| Authors: | Nhung T T Nguyen Dr Hiroyasu Furukawa Dr Felipe Gándara Dr Hoang T Nguyen Kyle E Cordova Prof Omar M Yaghi |
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| Institution: | 1. Center for Molecular and NanoArchitecture (MANAR), Vietnam National University, Ho Chi Minh City (VNU ‐ HCM), Ho Chi Minh City, 721337 (Vietnam);2. Department of Chemistry, University of California ‐ Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory, Kavli Energy NanoSciences Institute at Berkeley, Center for Global Science at Berkeley, Berkeley, CA 94720 (USA);3. King Fahd University of Petroleum and Minerals, Dhahran (Saudi Arabia) |
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| Abstract: | 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 CO2 from N2 under both dry and humid conditions without any loss of performance over three cycles and can be regenerated simply by using a N2 flow at ambient temperature. |
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| Keywords: | carbon dioxide dynamic separation hydrophobic metal– organic frameworks zeolitic imidazolate frameworks |
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