Chaotic pH Oscillations in the Hydrogen Peroxide - Thiosulfate - Sulfite Flow System

G. Rábai, Ichiro Hanazaki

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Detailed numerical studies and experiments have revealed that two types of limit cycle pH oscillations with very different frequencies, complex periodic behavior, and chaos are exhibited by a catalyst-free H2O2-S2O32--SO 32--H+ aqueous reaction system in a continuous-flow stirred tank reactor at 20.0 °C. Chaos appears around pH 6 in the case of a small excess of H2O2 over the reducing agents in a narrow range of input concentrations and flow rates. The main features of the observed dynamical behavior have been reproduced by a simple chemical mechanism derived from an earlier proposed model of the Cu2+-catalyzed H2O2-S2O32- oscillatory reaction. Slow and reversible proton-assisted dehydration of HOS2O3- intermediate to S2O3 reactive species and its subsequent reaction with S2O32- to form S4O62- have been considered in addition to earlier proposed composite reactions.

Original languageEnglish
Pages (from-to)7268-7273
Number of pages6
JournalJournal of Physical Chemistry A
Volume103
Issue number36
Publication statusPublished - Sep 9 1999

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Thiosulfates
sulfites
Sulfites
hydrogen peroxide
Chaos theory
Hydrogen Peroxide
oscillations
Reducing Agents
Dehydration
chaos
Protons
Flow rate
Catalysts
Composite materials
dehydration
flow velocity
Experiments
reactors
catalysts
cycles

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Chaotic pH Oscillations in the Hydrogen Peroxide - Thiosulfate - Sulfite Flow System. / Rábai, G.; Hanazaki, Ichiro.

In: Journal of Physical Chemistry A, Vol. 103, No. 36, 09.09.1999, p. 7268-7273.

Research output: Contribution to journalArticle

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