亚氯酸盐氧化硫脲非缓冲体系的复杂动力学行为  

Complex Kinetics Behaviors of Thiourea Oxidation by Chlorite in Unbuffered Solution

作　　者：王新红[1] 高庆宇[2] 

机构地区：[1]盐城师范学院化学系,盐城224002 [2]中国矿业大学化工学院,徐州221008

出　　处：《化学通报》2006年第8期601-605,共5页Chemistry

基　　金：国家自然科学基金(20103010);教育部年青教师基金;盐城师范学院院级科研(05YCKW1059)资助项目

摘　　要：研究了ClO2--SC(NH2)2的非缓冲体系中的动力学行为,发现在开放体系中,体系的铂电极电位和pH呈现反相位连续的大幅度振荡,随着流速的降低,体系行为更加丰富,在高流速的混合模式之后出现了低流速的混合模式;在外部条件变化时,观察到了准周期振荡和倍周期振荡现象;考察了温度、流速、酸度以及反应物的初始浓度比等主要的影响因素,发现分叉参数的变化与体系的行为紧密相关。An unbuffered system is built up to investigate nonlinear dynamical phenomena of thiourea oxidation reaction by chlorite in the solution. The concentration of hydrogen ions does exhibit periodic oscillation, and two types of bifurcation leading to periodic variations are found when the flow rate is further increased. Meanwhile, The dependence of complex oscillations on initial compositions of the reaction mixture, flow-rate, acidity and temperature have also been investigated, which showed that： （a） lowering the reaction temperature facilitates the occurrence of complex oscillations; （b） the flow rate of reductants increases with respect to the temperature; and （c） particularly, mixed-mode oscillations are exhibited different from ones in the high flow rate. The stable oscillatory state may arise from the oxidation of sulfur（- Ⅱ） to sulfate, including pH oscillations which are not reported in the chlorite-thiourea system.

关 键 词：pH振荡 混合模式振荡 准周期振荡 倍周期振荡 

分 类 号：O643.1[理学—物理化学]