摘要
研究了Ｈ_２Ｏ_２－ＳＣ（ＮＨ_２）_２－Ｃｕ^（２＋）－Ｈ~＋反应体系在封闭条件下以及在ＣＳＴＲ中的振荡行为。体系在封闭条件下出现单峰振荡行为，其振幅和诱导期与反应温度、［Ｈ_２Ｏ_２］、［ＳＣ（ＮＨ_２）_２］等有关，在ＣＳＴＲ中体系的Ｐｔ电极电位、铜离子选择性电极电位以及ｐＨ值均显示稳定的周期性振荡；考察其振荡过程的流速序列，发现在低流速下出现周期性复杂振荡，体系没有双稳态出现。
The reaction between hydrogen peroxide and thiourea in acidic medium(HCLO_4) catalyzed by Cu￣(2+) has been studied both in a closed(batch) system and in a flow reactor (CSTR). A new thiourea oscillator has been found. Under the batch condition the reaction displays single-peak oscillation behavior in the redox potential. Amplitude and induction time of the reaction vary as the initial reactant concentrations and the temperature of reaction. This induction time could be reduced by higher initial hydrogen peroxide concentrations and lower initial thiourea concentrations.In the CSTR, the reaction system displays sustained periodic oscillations in the potentials of Pt electrode and Cu￣(2+)-selective electrode and pH electrode, As the flow rate is decreased, complex oscillations appear. The oscillatory region is shown in phase diagrams.The oscillation behavior is related to[H2O2]/[SC(NH2)2]ratio. No bistability is observed in the system.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第5期739-742,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
