Chloride Induced Oscillations in the Classical Belousov-Zhabotinsky Reaction Explained by the "Radicalator"-Model

Abstract

We detected non-bromide controlled oscillations, which appear in a classical Belousov-Zhabotinsky (BZ) system at a high malonic acid/bromate ratio in the presence of added chloride. The oscillations start immediately after the addition of the catalyst. To explain the oscillations we assume control by a synergetic process involving both chloride ions and malonyl radicals. The experiments are well in accordance with calculations based on the "Radicalator" model. This model is also capable of explaining the rate of formation of CO2 in the BZ system.

Effect of Oxygen on the Belousov−Zhabotinsky Reaction at Low Cerium Concentrations

“…Under similar conditions but with [BrMA] 0 = 0 M, [BrO 3 - ] 0 = 0.1 M, and [Ce 4+ ] 0 = 10 -4 M and [MA] = 0.1 M, or [Ce 4+ ] 0 = 10 -3 M and [MA] = 0.8 M, the simulations give a very long induction period without oscillations for t ≤ 3000 s. If the reactions R35a and R35b (or only R35b) are eliminated, one obtains oscillations ( T = 346 s) without an induction period in the first case. This is, however, not what is observed experimentally. , …”

Spatial and temporal dynamics of Belousov-Zhabotinsky reaction: A STEM approach

“…The kinetic scheme originally proposed by Field, Körös, and Noyes (FKN) is the most common chemical mechanism to describe the dynamics of the BZ reaction [13]. Nevertheless, it is not the only one, there are different chemical models that try to explain the dynamics of the reaction BZ considered that intermediate chemical species, such as MA * or Br * would play an important role in the feedback mechanism of the reaction, such is the case of the Radicalator [22,18,29].…”