CO2 capture from wet flue gas using a water-stable and cost-effective metal-organic framework
Ryan Loughran, Tara Hurley, Andrzej Gładysiak, Arunraj Chidambaram, Konstantin Khivantsev, Éric Walter, Trent R. Graham, Patrick N. Reardon, János Szanyi, Dylan B. Fast, Quin R. S. Miller, Ah‐Hyung Alissa Park, Kyriakos C. Stylianou
Abstract
We report the use of MIL-120 as a water-stable and cost-effective metal-organic framework (MOF) for selectively capturing CO2 from wet flue gas. Synthesized using inexpensive and environmentally benign reagents in water, MIL-120 possesses one-dimensional pores decorated with hydroxyl-bridged Al(III) ions and benzene rings with an interstitial spacing of 4.78 Å. Carbon dioxide isotherms show steep uptake at low pressure, and the affinity of MIL-120 for CO2 is 44 kJ mol−1. CO2-loading 13C solid-state nuclear magnetic resonance and Fourier transform infrared spectra tracking the sorption of CO2 into MIL-120 revealed that the interplay of pore size, functionality, and dimensionality is vital for CO2 restriction within the pores of MIL-120. Breakthrough experiments reveal that MIL-120 can capture CO2 from dry and wet flue gas with uptake capacities of 1.215 and 1.118 mmol g−1, respectively. Our work highlights the synthetic benefits of MIL-120 and elucidates its selective capture of CO2 from wet flue gas.