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

Michael Barter, Jon Hartley, Francois-Joseph Yazigi, Ross J. Marshall, Ross S. Forgan, Adrian Porch, Martin Owen Jones

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)10460-10469
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number15
Early online date4 Apr 2018
DOIs
Publication statusPublished - 21 Apr 2018

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