Uranium + water reaction. Part 1.—Kinetics, products and mechanism
Uranium + water reaction. Part 1.—Kinetics, products and mechanism
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铀+水反应。第 1 部分——动力学、产物和机理
DOI：
10.1039/tf9666202513
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发表时间：
1966
影响因子：
--
通讯作者：
S. Orman
中科院分区：
文献类型：
--
作者：
M. Baker;L. Less;S. Orman
研究了温度、相对湿度和pH对铀+水反应速率的影响。在不同的温度下，得到了腐蚀和析氢的线性速率，得到的活化能从12到17千卡摩尔- 1不等，这取决于铀的批次。氢对反应没有影响。在不同的温度和相对湿度条件下对反应产物进行了研究。对氢化铀+水体系进行了平行研究。数据与氧化产物UO2.06±0.02一致，含有2-9%的保护形态氢化铀。提出了氢氧根离子扩散和氢化铀作为部分中间体形成的反应机理。认为速率控制步骤是水通过细毛细血管扩散到氧化物表面。
The effects of temperature, relative humidity and pH on the rate of the uranium + water reaction have been studied. Linear rates of corrosion and hydrogen evolution are obtained at different temperatures and the derived activation energies vary from 12 to 17 kcal mole–1 depending on the batch of uranium. Hydrogen has no effect on the reaction. The products of the reaction have been investigated under varying conditions of temperature and relative humidity. Parallel studies have been made of the uranium hydride + water system. The data are consistent with an oxide product UO2.06±0.02, containing 2–9% uranium hydride in a protected form. A reaction mechanism is proposed, involving OH– ion diffusion and formation of uranium hydride as a partial intermediate. It is suggested that the rate-controlling step is diffusion of water through fine capillaries to the oxide surface.