Sustained oscillations in the concentrations of bromide and chlorine dioxide and the potential of a platinum electrode are observed in acidic solutions containing bromate, chlorite, and bromide in a flow reactor. The bromide flow may be replaced by a flow of any of several reducing agents (I-, SO32-, Fe(CN)64-, AsO33-, Sn2+) capable of generating bromide from bromate. The bromate-chlorite reaction is autocatalytic in batch and bistable in flow. It is shown how addition of the feedback species (bromide or other reductant) leads to oscillation. A nine-step mechanism is proposed which, in a series of computer simulations, gives qualitative agreement with the observed autocatalysis, bistability, and oscillation.
|Number of pages||8|
|Journal||Journal of physical chemistry|
|Publication status||Published - Dec 1 1983|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry