以咖啡酸-KBrO_3-H_2SO_4-Mn^(2+)为体系的化学振荡及其十字相图

Chemical Oscillations in the Bromate-Manganous-Caffeic Acid-Sulfuric Acid System and Its Cross-shaped Diagram

本文报道的是一种新的 BZ 化学振荡反应.该反应是在酸性介质中,在锰离子催化下,咖啡酸被溴酸盐氧化所引起的化学振荡反应.就该体系在间歇反应器和连续流动体系中的振荡行为作了研究,得出了不同浓度、温度及流速下的特征振荡图形,计算出该振荡反应及其诱导期的活化能,并采用改变流速寻找双稳态的方法找出振荡的浓度区间,作出十字相图.

In this paper we report that a new organic reductant,caffeic acid,gives rise tosustained oscillation in the Bromate-Manganous-Sulfuric Acid system.Experimentalinvestigations of this system showed that oscillation pheneomena can be observed in bothbatch reactors and continuous-flow stirred tank reactorSTR).The activationenergies of the oscillating reaction and its induction period had been calculated from theexperimental data with good linear dependent coeffients.According to the general stability condition,a typical twodimensional cross-shapeddiagram has been shown by a series experiments with various flow rates andconcentrations of reactants.