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Selective Hysteretic Sorption of Light Hydrocarbons in a Flexible Metal–Organic Framework Material

DOI: 10.1021/acs.chemmater.6b00443 DOI Help

Authors: Shan Gao (University of Nottingham) , Christopher Morris (University of Manchester) , Zhenzhong Lu (University of Manchester) , Yong Yan (University of Nottingham) , Harry Godfrey (University of Manchester) , Claire Murray (Diamond Light Source) , Chiu Tang (Diamond Light Source) , K. Mark Thomas (University of Newcastle upon Tyne) , Sihai Yang (University of Nottingham) , Martin Schroeder (Structural Genomic Consortium, Oxford; University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: March 2016

Open Access Open Access

Abstract: Porous MFM-202a (MFM = Manchester Framework Material, replacing the NOTT designation) shows an exceptionally high uptake of acetylene, 18.3 mmol g–1 (47.6 wt %) at 195 K and 1.0 bar, representing the highest value reported to date for a framework material. However, at 293 K and 10 bar C2H6 uptake (9.13 mmol g–1) is preferred. Dual-site Langmuir-Freundlich (DSLF)- and Numerical Integration (NI)-based IAST methods have been used to analyze selectivities for C1 to C3 hydrocarbons. MFM-202a exhibits broadly hysteretic desorption of acetylene; such behavior is important for practical gas storage since it allows the gas to be adsorbed at high pressure but stored at relatively low pressure. Stepwise uptake and hysteretic release were also observed for adsorption of other unsaturated light hydrocarbons (ethane and propene) in MFM-202a but not for saturated hydrocarbons (methane, ethane, and propane). MFM-202a has been studied by in situ synchrotron X-ray powder diffraction to reveal the possible phase transition of the framework host as a function of gas loading. A comprehensive analysis for the selectivities between these light hydrocarbons has been conducted using both IAST calculation and dual-component mixed-gas adsorption experiments, and excellent agreement between theory and experiment was achieved.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

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