Abstract
Effective SF6 gas storage and SF6/N2 mixture separations are extremely important in the industry. Herein, a series of isostructural metal-organic frameworks (MOFs), [Cu6(H2O)3(NTB)4(PYZ)1.5] (SNNU-202, H3NTB = nitrilotribenzoic acid, PYZ = pyrazine), [Cu12(H2O)3(NTB)8(PYZ)3(BPY)1.5] (SNNU-203, BPY = 4,4′-bipyridine) and [Cu6(NTB)4(DABCO)1.5(BPY)1.5] (SNNU-204, DABCO = 1,4-diazabicyclo[2.2.2]octane), with different pore window sizes have been explored for the adsorption and separation performance of sulfur hexafluoride. With stepwise partitioning of the pore window, the adsorption capacity for SF6 and separation of SF6/N2 mixture are gradually improved. Notably, the SF6 uptake value for SNNU-204 is 6.0 mmol g−1 and the amount of substance ratio of SF6-to-N2 uptake can be up to 29.8 at 298 K and 1 bar, surpassing most of top-performing MOFs reported. Ideal adsorbed solution theory (IAST) calculations and breakthrough curves demonstrated that SNNU-204 exhibited excelling separation performance. The stepwise pore window partition can create more micropores, and the aromatic ring of the inserted ligand also facilitates interaction with sulfur hexafluoride gas molecules, providing an important strategy for the application of MOFs in SF6 gas adsorption and separation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.