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

Lookup NU author(s): Emeritus Professor Mark Thomas

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Porous MFM-202a (MFM = Manchester Framework Material, 12 replacing the NOTT designation) shows an exceptionally high uptake of 13 acetylene, 18.3 mmol g−1 (47.6 wt %) at 195 K and 1.0 bar, representing the 14 highest value reported to date for a framework material. However, at 293 K 15 and 10 bar C2H6 uptake (9.13 mmol g−1) is preferred. Dual-site Langmuir− 16 Freundlich (DSLF)- and Numerical Integration (NI)-based IAST methods 17 have been used to analyze selectivities for C1 to C3 hydrocarbons. MFM-202a 18 exhibits broadly hysteretic desorption of acetylene; such behavior is important 19 for practical gas storage since it allows the gas to be adsorbed at high pressure 20 but stored at relatively low pressure. Stepwise uptake and hysteretic release 21 were also observed for adsorption of other unsaturated light hydrocarbons 22 (ethane and propene) in MFM-202a but not for saturated hydrocarbons 23 (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 25 comprehensive analysis for the selectivities between these light hydrocarbons has been conducted using both IAST calculation 26 and dual-component mixed-gas adsorption experiments, and excellent agreement between theory and experiment was achieved.


Publication metadata

Author(s): Gao S, Morris CG, Lu Z, Godfrey HGW, Murray C, Tang CC, Thomas KM, Yang S, Schroder M

Publication type: Article

Publication status: Published

Journal: Chemistry of Materials

Year: 2016

Volume: 28

Issue: 7

Pages: 2331-2340

Print publication date: 12/04/2016

Online publication date: 31/03/2016

Acceptance date: 08/03/2016

Date deposited: 01/04/2016

ISSN (print): 0897-4756

ISSN (electronic): 1520-5002

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/acs.chemmater.6b00443

DOI: 10.1021/acs.chemmater.6b00443


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