原子能科学技术2018，Vol.52Issue(2)：240-246,7.DOI:10.7538/yzk.2018.52.02.0240
Pt催化N2H4还原U(Ⅵ)制备U(Ⅳ)过程中N2H4断键机制研究
Study on Bond Breaking Mechanism for Process of U(Ⅳ) Produced by N2H4Reducing U(Ⅵ)with Platinum as Catalyst
摘要
Abstract
In order to optimize the process conditions of U(Ⅳ)produced by N2H4reduc-ing U(Ⅵ)with platinum as catalyst in the nitric acid environment,determine the con-trol steps of the reaction process,improve the rate of controlling step in the reaction, and determine the reaction path and reaction mechanism,it is necessary to confirm the manner of bond breaking and decomposition mechanism of the N2H4with Pt as catalyst.In order to determine the bond breaking mechanism of N 2H4in this process,gas chro-matography,spectrophotometry,titration and drainage method were used in this paper to analyze the product in the process of U(Ⅳ)produced by N2H4reducing U(Ⅵ)with Pt as catalyst in the nitric acid environment.The results show that there is no hydrazoic acid,nitrogen oxides or hydrogen product in the process.The main product is N2,and the consumption ratio of N2to N2H4is close to 1:1.When there is U(Ⅵ),the yield of N H+4is low,and the production rate of N H +4increases sharply when the U(Ⅵ)reaction is complete.N—N bond breaking and N— H bond breaking coexist.Increasing tempera-ture is conducive to speed up the reduction reaction.关键词
N2H4/铀/铂/催化/断键机制Key words
N2H4/uranium/platinum/catalysis/bond breaking mechanism分类
化学化工引用本文复制引用
张晓腾,李斌,周贤明,刘利生,郝帅,蒋冬梅,夏良树..Pt催化N2H4还原U(Ⅵ)制备U(Ⅳ)过程中N2H4断键机制研究[J].原子能科学技术,2018,52(2):240-246,7.基金项目
国家自然科学基金资助项目(11575078) （11575078）
