Quest for an optimal methane hydrates formation in the pores of hydrolytically stable MOFs

Carlos Cuadrado-Collados, Georges Mouchaham, Luke L. Daemen, Yongqiang Cheng, Anibal J. Ramirez-Cuesta, Himanshu Aggarwal, Alexander Missyul, Mohamed Eddaoudi, Youssef Belmabkhout, Joaquin Silvestre-Albero

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Porous MOFs capable of storing relatively high amount of dry methane (CH4) in adsorbed phase are largely explored, however solid CH4 storage in confined pores of MOFs in the form of hydrates is yet to be discovered. Here we report a rational approach to form CH4 hydrates by taking advantage of the optimal pore confinement in relatively narrow cavities of hydrolytically stable MOFs. Unprecedentedly, we were able to isolate methane hydrate (MH) nanocrystals with a sI structure encapsulated inside MOF pores with an optimal cavity dimension. It was found, that confined nanocrystals require cavities slightly larger than the unit cell crystal size of MHs (1.2 nm), as exemplified in the experimental case study performed on Cr-soc-MOF-1 vs smaller cavities of Y-shp-MOF-5. Under these conditions, the excess amount of methane stored in the pores of Cr-soc-MOF-1 in the form of MH was found to be 50% larger than the corresponding dry adsorbed amount at 10 MPa. More importantly, the pressure gradient driving the CH4 storage/delivery process could be drastically reduced compared to the conventional CH4 adsorbed phase storage on the dry Cr-soc-MOF-1 (≤3 MPa vs. 10 MPa)
Original languageEnglish (US)
JournalJournal of the American Chemical Society
DOIs
StatePublished - Jul 11 2020

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