Hydrophilic pore-blocked metal-organic frameworks: a simple route to a highly selective CH4/N-2 separation

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The separation of gas mixtures with similar thermodynamic and transport properties is a challenging issue. For that, various types of adsorbents and membranes have been introduced. To date, solving this difficult problem remains an urgent core task in the energy and environment fields. Herein, we introduce a simple method to achieve highly selective separation of CH4/N-2. To demonstrate our concept, a CH4/N-2 mixture was separated by Cu3BTC2 filled with water, with the water blocking the hydrophilic pore to reject the inclusion of gas molecules having weak affinity for water, and with the empty hydrophobic pores acting as gas storage sites. This led to high equilibrium selectivity of the CH4/N-2 mixture, at 24.7, which is 6 times higher than the untreated Cu3BTC2 itself. Moreover, the formation of methane hydrate in the mesopore of MOF was observed.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

GRAPHENE OXIDE MEMBRANES; AMORPHOUS SOLID WATER; CARBON-DIOXIDE; CO2 CAPTURE; ADSORPTION; CLUSTERS; N-2; CH4; ZEOLITES; HYDRATE

Citation

RSC ADVANCES, v.5, no.4, pp.2749 - 2755

ISSN
2046-2069
DOI
10.1039/c4ra12967a
URI
http://hdl.handle.net/10203/194459
Appears in Collection
CBE-Journal Papers(저널논문)
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