G. Rabai, PERIOD-DOUBLING ROUTE TO CHAOS IN THE HYDROGEN-PEROXIDE-SULFUR(IV)-HYDROGEN-CARBONATE FLOW SYSTEM, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(38), 1997, pp. 7085-7089
Both simulations and experimental results show that a period-doubling
route leads from simple pH oscillations through period 2 and period 4
cascades to chaos in an aqueous H2O2-sulfur(IV)-HCO3- flow system by v
arying either the removal rate of CO2 from the reaction mixture or the
flow rate. Windows of stable period 3 oscillations are also found in
the wide chaotic region calculated in the [H2O2](0)-[SO32-](0) plane.
An autocatalytic production of H+ during the oxidation of sulfur(IV) b
y H2O2 is responsible for the positive feedback, while a H+ consuming
negative feedback is provided by the relatively slow reversible format
ion of CO2 (HCO3- + H+ reversible arrow CO2 + H2O) and its controlled
escape from the surface of the reaction mixture. Protonation of SO32-
also contributes to the removal of the free H+. Such a multichannel ne
gative feedback appears to be the clue to the chaotic dynamical behavi
or. This seems to be the simplest known chaotic chemical reaction syst
em.