对氨基苯甲酸BZ反应体系分区振荡行为的研究

分区振荡（也被称为双振荡，dual－frequencyoscillation）现象是封闭反应体系中发现的一种较为特殊的振荡现象，FKN机理1]和OKN机理2]都不能很好地解释这种振荡行为，Forsterling等曾提出了自由基控制机制3,4]；Srivastava等则认为高、低频区均为溴控机制5]．目前，这一问题还没有确切结论．本文报导了对氨基苯甲酸BZ反应体系中的分区振荡行为，并对分区振荡的机理作了一些探讨．1实验以对氨基苯甲酸－KBrO3－H2SO4的振荡反应作为研究体系，反应在带夹会的封闭玻璃反应器中进行，由恒温措恒温；自制Pt电极和216型Ag电极作x作电…

Studies on the Oscillation of p-H_2NC_6H_4COOH-KBrO_3-H_2SO_4 System

The oscillations of P-H2NC6H4COOH-KBrO3- H2SO4 system are studied. The dual-frequency oscillations are found in this system. Furthermore, the influences of initial reaction conditions (concentrations of reactans and temperature) metal-ion catalysts and several additives on oscillating behaviors are concluded. These experimental phenomena suggested that the dual-frequency oscillations are controlled by two types of mechanism,one is bromide-ion controlling to the lower frequency oscillations, the other is non-brominde ion controlling to the higher ones, in which the substrate radicals play an important role.Moreover, these mechainsms are competing in the reaction system when the situation is fit for each one. Some interpretations about this are approached from the analysis of the composion of substrates and the viriation of potential during the reaction.