Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8725
Title: Thermal and kinetic analysis of uranium salts: Part 1. Uranium (VI) oxalate hydrates
Authors: Çetişli, Halil
Çılgı, Gülbanu Koyundereli
Donat, Ramazan
Keywords: Kinetic analysis
Kinetic model
TG
Thermal decomposition
Uranyl oxalate
Activation energy
Decomposition
Dehydration
Kinetic parameters
Kinetic theory
Nitrogen
Oxalic acid
Oxygen
Pyrolysis
Thermolysis
X ray powder diffraction
Decomposition mechanism
Decomposition products
Decomposition reaction
Kinetic modeling
Thermal decomposition kinetics
Thermodynamic functions
Uranium compounds
Publisher: Kluwer Academic Publishers
Abstract: The thermal decomposition kinetics of UO 2 C 2 O 4 ·3H 2 O were studied by TG method in a flowing nitrogen, air, and oxygen atmospheres. It is found that UO 2 C 2 O 4 ·3H 2 O decomposes to uranium oxides in four stages in all atmosphere. The first two stages are the same in the whole atmosphere that correspond to dehydration reactions. The last two stages correspond to decomposition reactions. Final decomposition products are determined with X-Ray powder diffraction method. Decomposition mechanisms are different in nitrogen atmosphere from air and oxygen atmosphere. The activation energies of all reactions were calculated by model-free (KAS and FWO) methods. For investigation of reaction models, 13 kinetic model equations were tested and correct models, giving the highest linear regression, lowest standard deviation, and agreement of activation energy value to those obtained from KAS and FWO equations were found. The optimized value of activation energy and Arrhenius factor were calculated with the best model equation. Using these values, thermodynamic functions (?H * , ?S * , and ?G * ) were calculated. © 2011 Akadémiai Kiadó, Budapest, Hungary.
URI: https://hdl.handle.net/11499/8725
https://doi.org/10.1007/s10973-011-1826-9
ISSN: 1388-6150
Appears in Collections:Fen-Edebiyat Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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