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A thermogravimetric...
A thermogravimetric study of thermal dehydration of copper hexacyanoferrate by means of model-free kinetic analysis
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- Åkerblom, Ida E. (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Ojwang, Dickson O. (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Grins, Jekabs (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Svensson, Gunnar (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- 2017-03-16
- 2017
- English.
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In: Journal of thermal analysis and calorimetry (Print). - : Springer Science and Business Media LLC. - 1388-6150 .- 1588-2926. ; 129:2, s. 721-731
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Abstract
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- The kinetics of thermal dehydration of K2x/3Cu[Fe(CN)6]2/3·nH2O was studied using thermogravimetry for x = 0.0 and 1.0. Data from both non-isothermal and isothermal measurements was used for model-free kinetic analysis by the Friedman and KAS methods. The water content was determined to be n = 2.9 – 3.9, with an additional ~10% of water, likely surface adsorbed, that leaves very fast when samples are exposed to a dry atmosphere. The determined activation energies are 19 kJ (mol H2O)-1 for x = 0.0 and 16 kJ (mol H2O)-1 for x = 1.0. 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 for that the H2O molecules form bonds to the incorporated K+ ions.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Copper hexacyanoferrate
- Thermal dehydration
- Thermogravimetry
- Kinetic analysis
- Activation energy
- Dehydration enthalpy
- Inorganic Chemistry
- oorganisk kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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