三价铀在空气中的氧化动力学研究

A Study of Kinetics of Oxidation Reaction of Uranium (Ⅲ) with Oxygen in the Air

测定了盐酸介质中铀(Ⅲ)在空气中的氧化速率以及不同条件对氧化速率的影响,得出反应速率方程。反应速率随温度升高而增加,表观活化能为34.3kJ/mol。铀(Ⅲ)在空气中转化为铀(Ⅳ)的反应,可能是一个发生在气液相界面的催化氧化过程。

The oxidation reaction of uranium (Ⅲ) in the hydrochloric acid solution with oxygen in the air was investigated. It was found that the oxidation rate was proportional to [U(Ⅲ)] and [Cl-]-1/2 in hydrochloric acid solution and [O2]1/4(6) in air . Moreover, the rates were nearly independent of [H+] in the range of 0. 2~2 mol/L. The oxidation rate increased with increasing temperature. The apparent activation energy was found to be 3-1. 3 kJ/mol in the temperatures of 10 to 40℃ region. It is suggested that the reaction may be a catalytic oxidation process.