Effect of bromide concentration on the induction period of the cerium-catalysed Belousov-Zhabotinsky oscillating reaction

Abstract

Temporal oscillations of the cerium(IV)-catalysed Belousov-Zhabotinsky reaction under addition of various Br– concentrations are investigated. The relationship between the induction period and Br– concentration, which is a controlling species in the BZ oscillating reaction, is reported. The oscillations of the Ce(IV) catalyst are followed by using UV-Vis spectrophotometric methods under closed batch and oxygen free systems. Experimental observations demonstrate that increasing Br– concentration decreases the induction period exponentially, whereas it increases the oscillation period linearly. The results reveal that the oscillations without induction period are observed by the addition of 1.0 × 10−2 M Br– concentration. Addition of Br– into the BZ solution mainly involves the process A of the FKN mechanism. Numerical results reveal that the addition of Br– increases the production of BrMA, but decreases the induction period.