典型文献
Kinetics and Mechanism of Catalytic Reduction of U(Ⅵ)with Hydrazine on Platinum Catalysts in Nitric Acid Media
文献摘要：
The kinetics of U(Ⅳ)produced by hydrazine reduc-tion of U(Ⅵ)with platinum as a catalyst in nitric acid media was studied to reveal the reaction mech-anism and optimize the reaction process.Electron spin resonance(ESR)was used to determine the in-fluence of nitric acid oxidation.The effects of nitric acid,hydrazine,U(Ⅵ)concentration,catalyst dosage and temperature on the reaction rate were also stud-ied.In addition,the simulation of the reaction pro-cess was performed using density functional theory.The results show that the influence of oxidation on the main reaction is limited when the concentration of nitric acid is below 0.5 mol/L.The reaction kinetics equation below the concentration of 0.5 mol/L is found as:-dc(UO22+)/dt=kc0.5323(UO22+)c0.2074(N2H5+)c-0.2009(H+).When the temperature is 50℃,and the solid/liquid ratio r is 0.0667 g/mL,the reaction kinetics constant is k=0.00199(mol/L)0.4712/min.Between 20℃and 80℃,the reaction rate grad-ually increases with the increase of temperature,and changes from chemically controlled to diffusion-controlled.The simulations of density functional theory give further insight into the influence of various factors on the reaction process,with which the reaction mechanisms are determined according to the reaction kinetics and the simulation results.
文献关键词：
中图分类号：
作者姓名：
Xiao-teng Zhang;Shuai Hao;Fei-fei Tang;Bin Li;Xian-ming Zhou;Li-sheng Liu;Liang-shu Xia
作者机构：
School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Institute of Radiation Chemistry,China Institute of Atomic Energy,Beijing 102413,China
文献出处：
引用格式：
[1]Xiao-teng Zhang;Shuai Hao;Fei-fei Tang;Bin Li;Xian-ming Zhou;Li-sheng Liu;Liang-shu Xia-.Kinetics and Mechanism of Catalytic Reduction of U(Ⅵ)with Hydrazine on Platinum Catalysts in Nitric Acid Media)[J].化学物理学报（英文版）,2022(05):813-822
A类：
Hydrazine,kc0,N2H5+
B类：
Kinetics,Mechanism,Catalytic,Reduction,Platinum,Catalysts,Nitric,Acid,Media,kinetics,produced,by,hydrazine,reduc,platinum,catalyst,nitric,acid,media,was,studied,reveal,reaction,optimize,process,Electron,spin,resonance,ESR,used,oxidation,effects,concentration,dosage,temperature,rate,were,also,In,addition,performed,using,density,functional,theory,results,show,that,influence,main,limited,when,below,equation,found,dc,UO22+,dt,H+,When,solid,liquid,constant,Between,grad,ually,increases,changes,from,chemically,controlled,diffusion,simulations,give,further,insight,into,various,factors,which,mechanisms,are,determined,according
AB值：
0.482556
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