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A thermogravimetric study of thermal dehydration of copper hexacyanoferrate by means of model-free kinetic analysis
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 4
2017 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 129, no 2, 721-731 p.Article in journal (Refereed) Published
Abstract [en]

The kinetics of thermal dehydration of K2x/3Cu[Fe(CN)(6)](2/3)center dot nH(2)O was studied using thermogravimetry for x = 0.0 and 1.0. Data from both non-isothermal and isothermal measurements were used for model-free kinetic analysis by the Friedman and KAS methods. The water content was determined to be n = 2.9-3.9, plus an additional similar to 10% of water, likely surface adsorbed, that leaves very fast when samples are exposed to a dry atmosphere. The determined average activation energy for 0.2 ae<currency> alpha ae<currency> 0.8 is 56 kJ mol(-1). The dehydration is adequately described as a diffusion-controlled single-step reaction following the D3 Jander model. The determined dehydration enthalpy is 11 kJ (mol H2O)(-1) for x = 0.0 and 27 kJ (mol H2O)(-1) for x = 1.0, relative to that of water. The increase with increasing x is evidence that the H2O molecules form bonds to the incorporated K+ ions.

Place, publisher, year, edition, pages
2017. Vol. 129, no 2, 721-731 p.
Keyword [en]
Copper hexacyanoferrate, Thermal dehydration, Thermogravimetry, Kinetic analysis, Activation energy, Dehydration enthalpy
National Category
Mechanical Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-145966DOI: 10.1007/s10973-017-6280-xISI: 000404994900012OAI: oai:DiVA.org:su-145966DiVA: diva2:1141793
Available from: 2017-09-15 Created: 2017-09-15 Last updated: 2017-09-15Bibliographically approved

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Ojwang, Dickson O.Grins, JekabsSvensson, Gunnar
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