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Research articles

ScienceAsia 44 (2018): 102-108 |doi: 10.2306/scienceasia1513-1874.2018.44.102

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

Kwanjira Panpladoa, Premkamon Intasria, Atchara Sirimungkalaa, Titikan Somboonb,*

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.

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a Department of Chemistry, Faculty of Science, Khon Kaen University, Nai Muang, Muang District, Khon Kaen 40002 Thailand
b Department of Chemistry, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus, 150 Srijan Road, Nai Muang, Muang District, Khon Kaen 40000 Thailand

* Corresponding author, E-mail: oatsomboon@yahoo.com

Received 23 Aug 2017, Accepted 25 Dec 2017