Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal-organic framework systems
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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.
Barter , M , Hartley , J , Yazigi , F-J , Marshall , R J , Forgan , R S , Porch , A & Jones , M O 2018 , ' Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal-organic framework systems ' , Physical Chemistry Chemical Physics , vol. 20 , no. 15 , pp. 10460-10469 . https://doi.org/10.1039/C8CP00259B
Physical Chemistry Chemical Physics
© 2018 The Author(s). Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
DescriptionThanks to EPSRC for funding Michael Barter and to STFC ISIS Neutron and Muon Spallation facility for funding Michael Barter and for funding this research. RSF thanks the Royal Society for receipt of a University Research Fellowship, and the University of Glasgow for funding.
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