Kinetic Role of CO2 Escape in the Oscillatory H2O2-HSO3-HCO3- Flow System

Gyula Rábai, Noriaki Okazaki, Ichiro Hanazaki

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12 Citations (Scopus)


Experiments have been performed in a CSTR closed to the air to clarify the kinetic role of CO2 in the complex behavior observed during the autocatalytic oxidation of an aqueous solution of sulfur(IV) by hydrogen peroxide in the presence of hydrogen carbonate ions in a continuous-flow stirred tank reactor. Neither complex periodic nor chaotic oscillations, but simple periodic relaxation pH oscillations have been found if neither spontaneous escape nor controlled removal of CO2 from the reactor to the air were allowed. State diagrams delineating the behavior of the system at 4.0 °C under various input concentrations and flow rates have been obtained. A simple empirical rate law model could be used to simulate the behavior of the reaction system in a wide range of conditions. The critical role of CO2 escape is discussed.

Original languageEnglish
Pages (from-to)7224-7229
Number of pages6
JournalJournal of Physical Chemistry A
Issue number36
Publication statusPublished - Sep 9 1999

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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