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Issue 5, 2013
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Selective adsorption of ethylene over ethane and propylene over propane in the metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn)

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Abstract

A significant reduction in the energy costs associated with the cryogenic separation of ethyleneethane and propylenepropane mixtures could potentially be realized through the use of selective solid adsorbents that operate at higher temperatures. The metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn; dobdc4− = 2,5-dioxido-1,4-benzenedicarboxylate) are of particular interest for this application, owing to their high density of coordinatively unsaturated M2+ cation sites that can selectively interact with unsaturated hydrocarbons. Here, we present gas adsorption data for ethylene, ethane, propylene, and propane at 45, 60, and 80 °C for the entire series. The means of sample preparation and activation is found to be important for achieving high separation selectivities and capacities. While all of the compounds investigated show good performance characteristics, Fe2(dobdc) and Mn2(dobdc) exhibit the highest selectivities for the separation of ethyleneethane and propylenepropane mixtures, respectively. Crystal structures determined from neutron powder diffraction data elucidate the binding of ethane, ethylene, and propylene in Mn2(dobdc) and Co2(dobdc).

Graphical abstract: Selective adsorption of ethylene over ethane and propylene over propane in the metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn)

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Publication details

The article was received on 04 Jan 2013, accepted on 25 Feb 2013 and first published on 26 Feb 2013


Article type: Edge Article
DOI: 10.1039/C3SC00032J
Citation: Chem. Sci., 2013,4, 2054-2061

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    Selective adsorption of ethylene over ethane and propylene over propane in the metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn)

    S. J. Geier, J. A. Mason, E. D. Bloch, W. L. Queen, M. R. Hudson, C. M. Brown and J. R. Long, Chem. Sci., 2013, 4, 2054
    DOI: 10.1039/C3SC00032J

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