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Accelerated degradation of MOFs under flue gas conditions

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Author(s)

Enzo Mangano, Juergen Kahr, Paul Wright, Stefano Brandani

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Abstract

The zero length column (ZLC) technique is used to investigate the stability of Mg- and Ni-CPO-27 metal organic framework (MOF) crystals to the presence of water and humid flue gas. The design of the ZLC enables the stability test to be conducted over a considerably shorter time period and with lower gas consumption than other conventional techniques. A key advantage over other experimental methods to test the stability of adsorbents is the fact that the ZLC allows to quantify the amount adsorbed of every component present in the gas mixture. The developed protocol is based on a two-stage stability test. The samples were first exposed to a humid carbon dioxide and helium mixture in order to study the effect of water on the carbon dioxide adsorption capacity of the samples. In the second stage the samples were exposed to a flue gas mixture containing water. From the preliminary water stability test, the Ni-sample exhibited the highest tolerance to the presence of water, retaining approximately 85% of its pristine CO2 capacity. The Mg-MOFs deactivated rapidly in the presence of water. The Ni-CPO-27 was then selected for the second stage of the protocol in which the material was exposed to the wet flue gas. The sample showed an initial drop in the CO2 capacity after the first exposure to the wet flue gas followed by a stabilisation of the performance over several cycles.
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Original languageEnglish
Pages (from-to)181-195
JournalFaraday Discussions
Volume192
Early online date20 Apr 2016
DOIs
StatePublished - 1 Oct 2016

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