期刊论文

Mechanism of Pt-catalyzed N_2H_4 Decomposition by ESR Method

Xia, L.

中文

原子能科学技术

1000-6931

2018

52

2

247-254

10.7538/yzk.2017.youxian.0264

国家自然科学基金资助项目(11575078)；

本校为第一且通讯机构

采用电子自旋共振谱(ESR)法,研究了酸性条件下·NH_2的转化,HClO_4体系下反应时间对溶液中自由基产生的影响、pH值对N_2H_4断键的影响以及HNO_3中N是否对溶液中的·NH_2有贡献,确定了Pt催化N_2H_4分解的反应机理。结果表明:在酸性条件下·NH_2被DMPO捕捉时反应式为·NH_3~++HO-H+DMPO=NH_4~++DMPO(·OH),硝酸在Pt催化N_2H_4体系中不会发生断键产生·NH_2,所产生的·NH_2是由N_2H_4断键形成的;在HClO_4体系中,随着Pt催化N_2H_4反应时间的延长,N_2H_4中N-N断键的趋势逐渐减小,N-H断键的趋势逐渐增大;随pH值的增大,N_2H_4中N-N断键的速率先快速减小,pH>3后缓慢增大;Pt催化N_2H_4分解反应中N-N断键和...

Electron spin resonance (ESR) method was used in researching the conversion of •NH2 under acidic conditions, the effect of reaction time on the free radical production in HClO4 system, the effect of pH on the broken bond of N2H4, and whether N in HNO3 impacts on the production of •NH2. The reaction mechanism of N2H4 catalyzed by Pt was determined. The results show that the reaction of •NH2 captured by DMPO under acidic conditions is •NH3 ++HO-H+DMPO=NH4 ++DMPO(•OH). In Pt-catalyzed N2H4 the HNO3 doesn't break bond, and the •NH2 is only fr...