Kinetic studies of isothermal decomposition of (NH4)4UO2(CO3)3 to uranium oxide

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Progress in Reaction Kinetics and Mechanism Pub Date : 2020-05-01 DOI:10.1177/1468678319888629

Korichi Smain, Aoudia Nacera, Benelmaddjat Hanane, Kaci Smina, Ousmaal Nafissa

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Abstract

The ammonium uranyl carbonate, (NH4)4UO2(CO3)3, is an important material used in UO2 and U3O8 ceramics production for the nuclear fuel fabrication. Thermal study and kinetic analysis of ammonium uranyl carbonate conversion under isothermal conditions has been studied in air atmosphere to obtain the tri-uranium octoxide (U3O8), using muffle furnace equipment, UV–visible spectrophotometer, gas adsorption, Hg porosimetry, laser granulometry, and optic spectroscopy. The textural properties (specific surface area, morphology, pore size, grain size, inter-particular porosity, and intra-particular porosity) and characteristics (uranium content and stoichiometry) of the prepared samples were estimated from the physical–chemical characterization. The kinetic parameters were estimated by a fitting of the experimental data. The activation energy Ea , frequency factor A , and reaction rate constants k were calculated from the conventional and iso-conversion kinetic models and were within the range of literature values. The activation energy average values are 36.69 and 30.36 kJ mol−1 by conventional and iso-conversion models, respectively.

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(NH4)4UO2(CO3)3等温分解成氧化铀的动力学研究

碳酸铀酰铵(NH4)4UO2(CO3)3是生产核燃料用UO2和U3O8陶瓷的重要原料。采用马弗炉、紫外可见分光光度计、气体吸附、汞孔隙度法、激光粒度法和光谱学等方法，研究了等温条件下碳酸铀酰铵在空气气氛下转化得到三氧化铀(U3O8)的热力学研究和动力学分析。制备样品的结构性质(比表面积、形貌、孔径、晶粒尺寸、种间孔隙度和种内孔隙度)和特征(铀含量和化学计量学)由物理化学表征估计。通过对实验数据的拟合估计了动力学参数。根据常规和等转化动力学模型计算活化能Ea、频率因子A和反应速率常数k，均在文献值范围内。常规模型和等转换模型的平均活化能分别为36.69和30.36 kJ mol−1。

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来源期刊

Progress in Reaction Kinetics and Mechanism 化学-物理化学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.