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Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal-organic framework systems

Barter, Michael, Hartley, Jon, Joseph-Yazigi, Francois, Marshall, Ross, Forgan, Ross, Porch, Adrian and Owen Jones, Martin 2018. Simultaneous neutron powder diffraction and microwave dielectric studies of ammonia absorption in metal-organic framework systems. Physical Chemistry Chemical Physics 20 , pp. 10460-10469. 10.1039/c8cp00259b

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Funders: EPSRC
Date of First Compliant Deposit: 19 March 2018
Date of Acceptance: 7 March 2018
Last Modified: 28 Oct 2019 22:14
URI: http://orca-mwe.cf.ac.uk/id/eprint/109998

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