Metal-Organic Frameworks with Reduced Hydrophilicity for Postcombustion CO2 Capture from Wet Flue Gas
Wang, Yuxiang Hu, Zhigang Kundu, Tanay Cheng, Youdong Dong, Jinqiao Qian, Yuhong Zhai, Linzhi Zhao, Dan
Zhai, Linzhi
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Abstract
Copyright © 2018 American Chemical Society. Postcombustion CO2 capture from wet flue gas is a daunting challenge that metal-organic-framework-based (MOF-based) adsorbents need to address, because the moisture in the gas stream may not only hydrolyze the coordination bonds of MOFs but also be competitively adsorbed in MOFs leading to compromised CO2 capture performance. In this study, two isostructural water-stable MOFs decorated with alkyl groups, namely, UiO-66(Zr)-(OAc)2 and UiO-66(Zr)-(OPr)2, are synthesized from UiO-66(Zr)-(OH)2 via a facile postsynthetic esterification strategy and evaluated for their water affinity and CO2 capture performance. The increased water contact angle and reduced water vapor capacity at 60% relative humidity indicate the positive role of the propionyl group of UiO-66(Zr)-(OPr)2 in reducing material hydrophilicity. When the adsorbent beds are not fully saturated with water, breakthrough experiments using simulated wet flue gas reveal that UiO-66(Zr)-(OPr)2 possesses a CO2/N2 adsorption selectivity of 76.6, which is 229% that of UiO-66(Zr)-(OH)2 (33.4). Our study successfully demonstrates a scalable material modification approach to engineer MOF adsorbents toward practical CO2 capture processes under wet conditions.
Keywords
Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Green & Sustainable Science & Technology, Engineering, Chemical, Chemistry, Science & Technology - Other Topics, Engineering, Postcombustion CO2 capture, Pressure swing adsorption, Metal-organic frameworks, Postsynthetic modification, Wet gas breakthrough, CARBON-DIOXIDE, WATER-VAPOR, ADSORPTION PROPERTIES, SWING ADSORPTION, LOW-PRESSURE, FACILE, THERMODYNAMICS, EQUILIBRIUM, SELECTIVITY, RESISTANT
Source Title
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Publisher
AMER CHEMICAL SOC
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Date
2018-09-01
DOI
10.1021/acssuschemeng.8b02173
Type
Article