Irreversible Change of the Pore Structure of ZIF-8 in Carbon Dioxide Capture with Water Coexistence

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• 作者：Huang Liu ; Ping Guo ; Teresa Regueira ; Zhouhua Wang ; Jianfen Du ; Guangjin Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 23, 2016
• 年：2016
• 卷：120
• 期：24
• 页码：13287-13294
• 全文大小：374K
• 年卷期：0
• ISSN：1932-7455

文摘

The performance of zeolitic imidazolate framework-8 (ZIF-8) for CO₂ capture under three different conditions (wetted ZIF-8, ZIF-8/water slurry, and ZIF-8/water–glycol slurry) was systemically investigated. This investigation included the study of the pore structure stability of ZIF-8 by using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman detection technologies. Our results show that the CO₂ adsorption ability of ZIF-8 could be substantially increased under the existence of liquid water. However, the structure characterization of the recovered ZIF-8 showed an irreversible change of its framework, which occurs during the CO₂ capture process. It was found that there is an irreversible chemical reaction among ZIF-8, water, and CO₂, which creates both zinc carbonate (or zinc carbonate hydroxides) and single 2-methylimidazole crystals, and therefore the pore structure of ZIF-8 collapses. It is suggested therefore that care must be taken when using ZIF-8 or products containing ZIF-8 for gas capture, gas separation, or other applications where both water and acid gases coexist.