title: Limitations and high pressure behavior of MOF-5 for CO2 capture.
abstract: 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. In contrast 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 °C and 49% humidity) for an efficient CO2 capture. Isosteric heats of CO2 adsorption at high pressures show moderate interaction energy between CO2 molecules and the MOF-5 sorbent, which combined with the large sorption ability of MOF-5 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.
authors.affiliation: Graduate School of EEWS, KAIST, 291 Daehak-ro, Yuseong Gu, Daejeon 305-701, Republic of Korea.
authors.forename: Joo Young
authors.initials: JY
authors.lastname: Jung
authors.forename: Ferdi
authors.initials: F
authors.lastname: Karadas
authors.forename: Sonia
authors.initials: S
authors.lastname: Zulfiqar
authors.forename: Erhan
authors.initials: E
authors.lastname: Deniz
authors.forename: Santiago
authors.initials: S
authors.lastname: Aparicio
authors.forename: Mert
authors.initials: M
authors.lastname: Atilhan
authors.forename: Cafer T
authors.initials: CT
authors.lastname: Yavuz
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Han