核化学与放射化学2012，Vol.34Issue(4)：213-217,5.
高氯酸体系中肼为还原剂催化还原U(Ⅵ)的反应动力学
Catalytic Reaction Kinetics of U(Ⅵ) With Hydrazine on Platinum Black in Perchloric Acid Media
李斌 1何辉 1张秋月 1丁伯发 1王亮 1唐洪彬1
作者信息
- 1. 中国原子能科学研究院放射化学研究所,北京102413
- 折叠
摘要
Abstract
The kinetics of platinum-catalyzed reduction of U(Ⅳ) with hydrazine in perchloric acid media was studied. By investigating the influence of U(Ⅳ) concentration, hydrazine concentration, acidity and catalyst amounts (S/L) on the reaction, the reaction rate equation is obtained: -dc(UO22+ )/dt = kc0.39 (UO22+ )c0.36 (N2 H5+ )c-0.51 (H+ ), and the rate constant is 3. 2×10-3(mol/L)0.76/min at 60℃ and the solid-to-liquid ratio of 0. 002 kg/L. The effect of temperature was also investigated. The results show that while increasing the temperature, the reaction accelerates and the reaction process shifts from reaction-controlled to diffusion-controlled. Based on the above results, a possible reaction mechanism with the dissociation of adsorbed hydrazine on the catalyst as the the control step, is explored.关键词
肼/铂黑/铀(Ⅵ)/催化还原Key words
hydrazine/ platinum black/ U(VI)/ catalytic reaction分类
化学化工引用本文复制引用
李斌,何辉,张秋月,丁伯发,王亮,唐洪彬..高氯酸体系中肼为还原剂催化还原U(Ⅵ)的反应动力学[J].核化学与放射化学,2012,34(4):213-217,5.
