Pu催化HNO_2氧化U(Ⅳ)的研究  

Reaction Between U(Ⅳ) and Nitrous Acid Catalyzed by Plutonium

作　　者：王浩文[1] 周贤明[1] 李高亮[1] 兰天[1] 刘金平[1] 常尚文[1] 何辉[1] 段红卫[2] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《核化学与放射化学》2014年第5期295-299,共5页Journal of Nuclear and Radiochemistry

摘　　要：研究了Pu存在条件下HNO2氧化U(Ⅳ)的反应,并考察了HNO2浓度、反应温度、HNO3浓度、Pu浓度对U(Ⅳ)氧化速率的影响。结果表明:Pu对HNO2氧化U(Ⅳ)的反应具有显著催化作用;获得了Pu催化条件下HNO2氧化U(Ⅳ)的动力学方程:-dc(U(Ⅳ))/dt=kc(U(Ⅳ))c1.3(HNO3)c1.3(NO-2),得到了29℃时的反应速率常数k=(0.69±0.04)L2.6/(mol 2.6·min)。并对反应历程进行了探讨。The oxidation of U（Ⅳ）by nitrous acid in the present of plutonium was studied. The influence of the concentration of nitrous acid,nitric acid,plutonium on the oxidation of U（Ⅳ）was investigated.The results show that plutonium can catalyze the reaction between U（Ⅳ）and nitrous acid.And the rate equation of the reaction between U（Ⅳ）and nitrous acid catalyzed by plutonium was obtained：-dc（U（Ⅳ））/dt=kc（U（Ⅳ））c1.3 （HNO3 ）c1.3 （NO-2 ）, k=（0.69±0.04）L2.6/（mol2.6·min）when the temperature was 29 ℃.The mechanism of the oxidation of U（Ⅳ）was discussed.

关 键 词：HNO2 U(Ⅳ)氧化 Pu催化 机理 

分 类 号：O614.353[理学—无机化学]