Journal article
Irreversible Change of the Pore Structure of ZIF-8 in Carbon Dioxide Capture with Water Coexistence
Southwest Petroleum University China1
Center for Energy Resources Engineering, Centers, Technical University of Denmark2
Department of Chemical and Biochemical Engineering, Technical University of Denmark3
CERE – Center for Energy Ressources Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark4
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.
Language: | English |
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Year: | 2016 |
Pages: | 13287-13294 |
ISSN: | 19327455 and 19327447 |
Types: | Journal article |
DOI: | 10.1021/acs.jpcc.6b03772 |
ORCIDs: | Regueira Muñiz, Teresa |