Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8729
Title: Thermal and kinetic analysis of uranium salts: Part 2. Uranium (VI) acetate hydrates
Authors: Çılgı, Gülbanu Koyundereli
Çetişli, Halil
Donat, Ramazan
Keywords: Activation energy
Kinetic model
Model-free methods
Uranyl acetate
Decomposition
Kinetic parameters
Kinetic theory
Nitrogen
Oxygen
Polymer blends
Thermogravimetric analysis
Uranium dioxide
X ray powder diffraction
Decomposition products
Decomposition reaction
Kinetic model equation
Kinetic modeling
Model-free method
Thermal decomposition kinetics
Thermodynamic functions
Publisher: Kluwer Academic Publishers
Abstract: In this study the thermal decomposition kinetics of uranyl acetate dehydrate [UO 2 (CH 3 COO) 2 ·2H 2 O] were studied by thermogravimetry method in flowing nitrogen, air, and oxygen atmospheres. Decomposition process involved two stages for completion in all atmosphere conditions. The first stage corresponded to the removal of two moles of crystal water. The decomposition reaction mechanism of the second stage in nitrogen atmosphere was different from that in air and oxygen atmospheres. Final decomposition products were determined with X-ray powder diffraction method. According to these data, UO 2 is the final product in nitrogen atmosphere, whereas U 3 O 8 is the final product in air and oxygen atmospheres. The calculations of activation energies of all reactions were realized by means of model-free and modeling methods. Kissinger-Akahira- Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods were selected for model-free calculations. For investigation of reaction models, 13 kinetic model equations were tested. The model, which gave the highest linear regression, the lowest standard deviation, and an activation energy value which was close to those obtained from KAS and FWO equations, was selected as the appropriate model. The optimized value of activation energy and Arrhenius factor were calculated using the selected model equation. Using these values, thermodynamic functions (?H, ?S, and ?G) were calculated. © 2012 Akadémiai Kiadó, Budapest, Hungary.
URI: https://hdl.handle.net/11499/8729
https://doi.org/10.1007/s10973-011-2145-x
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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