Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 205, Issue -, Pages 58-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.05.012
Keywords
CO(2)capture; Membranes; Mixed matrix materials; ZIF-8; Poly(ethylene oxide)
Categories
Funding
- National Key Research and Development Program - China [2016YFE0117900]
- National Natural Science Foundation - China [51676171]
- Zhejiang Provincial Key Research and Development Program [2017C04001]
- U.S. National Science Foundation (NSF) [1506211]
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Amorphous polymers containing poly(ethylene oxide) are leading membrane materials for CO2 capture from fossil fuel-derived flue gas and syngas, such as those prepared from poly(ethylene glycol) diacrylate (PEGDA) and poly(ethylene glycol) methyl ether acrylate (PEGMEA). This work shows that introduction of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles in these polymers increases CO2 permeability with minimal effect on CO2/H-2 and CO2/N-2 selectivity. Specifically, ZIF-8 nanoparticles with a size of 150-250 nm were synthesized and fabricated into mixed matrix materials (MMMs). The effect of ZIF-8 loading on gas transport properties at 35 degrees C in MMMs was systematically investigated. Adding 10 wt% ZIF-8 in the crosslinked PEGDA increases CO2 permeability from 130 Barrers to 320 Barrers unexpectedly by 170% without any reduction of CO2 /light gas selectivity. While the CO2/fight gas selectivity in the MMMs can be satisfactorily described using the LewisNielsen model, the model underestimates the gas permeability. Despite a body of studies of MMMs comprising ZIFs, this work represents one of the few on the MMMs based on amorphous rubbery polymers elucidating the effect of ZIF-8 loading on the polymer properties and demonstrating their impact in achieving superior CO2/H-2 and CO2/N-2 separation properties.
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