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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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