Limitations and high pressure behavior of MOF-5 for CO2 capture

J. Y. Jung,‡ F. Karadas,‡ S. Zulfiqar,‡ E. Deniz, S. Aparicio, M. Atilhan*, C. T. Yavuz*, S. M. Han*
Phys. Chem. Chem. Phys., 15, 14319-14327, (2013). [pdf] [DOI] [WOS] (‡ Equal contribution)

Porous network structures (e.g. metal organic frameworks, MOFs) show considerable potential in dethroning monoethanol amine (MEA) from being the dominant scrubber for CO2 at the fossil-fuel-burning power generators. Contrary to their promise, structural stability and high-pressure behavior of MOFs are not well documented. We herein report moisture stability, mechanical properties and high-pressure compression on a model MOF structure, MOF-5. Our results show that MOF-5 can endure all tested pressures (0-225 bar) without losing its structural integrity, however, its moist air stability points at a 3.5-hour safety window (at 21.6 oC and 49% humidity) for an efficient CO2 capture. Isosteric heats of CO2 adsorption at high pressures show moderate interaction energy between CO2 molecules and MOF-5 sorbent, which combined with the MOF-5 large sorption ability in the studied pressure – temperature ranges show the viability of this sorbent for CO2 capturing purposes. The combination of the physicochemical methods we used suggests a generalized analytical standard for measuring viability in CO2 capture operations.

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