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Issue 15, 2018
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Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal–organic framework systems

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Abstract

Ammonia absorption has been investigated in metal–organic frameworks (UiO-67, HKUST-1 and CPO-27-Co) using custom-built apparatus that allows simultaneous neutron powder diffraction (NPD), microwave dielectric characterisation and out-gas mass spectroscopy of solid-state materials during ammonia adsorption. Deuterated ammonia was flowed through the sample and absorption monitored using mass flow meters and mass spectroscopy. Argon gas was then flowed through the ammoniated sample to cause ammonia desorption. Changes in structure found from NPD measurements were compared to changes in dielectric characteristics to differentiate physisorbed and metal-coordinated ammonia, as well as determine decomposition of sample materials. The results of these studies allow the identification of materials with useful ammonia storage properties and provides a new metric for the measurement of gas absorption within mesoporous solids.

Graphical abstract: Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal–organic framework systems

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Publication details

The article was received on 12 Jan 2018, accepted on 07 Mar 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP00259B
Citation: Phys. Chem. Chem. Phys., 2018,20, 10460-10469
  • Open access: Creative Commons BY license
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    Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal–organic framework systems

    M. Barter, J. Hartley, F. Yazigi, R. J. Marshall, R. S. Forgan, A. Porch and M. O. Jones, Phys. Chem. Chem. Phys., 2018, 20, 10460
    DOI: 10.1039/C8CP00259B

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