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Citation: Wang Shun, Gao Qing-Yu, Wang Xin-Hong, Lin Juan-Juan, Lai Shun-An, Mo Yan-Xue. Complex Kinetics of the Chlorite-Thiosulfate in an Unbuffered Reaction System[J]. Acta Physico-Chimica Sinica, ;2003, 19(08): 762-765. doi: 10.3866/PKU.WHXB20030818 shu

Complex Kinetics of the Chlorite-Thiosulfate in an Unbuffered Reaction System

1.
College of Chemical Engineering, China University of Mining and Technology, Xuzhou,　221008; Department of Chemistry and Material Science, Wenzhou Normal College, Wenzhou　325027

Received Date: 7 January 2003
Available Online: 15 August 2003

The complex kinetics of ClO2―-S2O32－ nonlinear reaction system in an unbuffered solution has been investigated in a CSTR. Both quasiperiodic and mixed-mode oscillations of pH and Pt potential were observed. At relatively low [NaClO2]0/[Na2S2O3]0 ratio, the system changed from small-amplitude oscillations and quasiperiodic oscillations to chaos and pure large-amplitude oscillations with increasing the flow rate. At higher initial concentration ratio, however, quasiperiodicity was given way to mixed-mode oscillations in which each period consists of one large and n small peaks (LSn). LS, LS2,LS3,…, LSn were obtained when the flow rate was decreased. For a narrow range of flow rate between each pair of periodic regions(LSn, LSn＋1), a region of aperiodic behavior, an apparently stochastic mixture of LSn and LSn＋1, was also observed. A general model based upon changes in the oxidation state of sulfur in the presence of a generic oxidant simulated the mixed-mode oscillations and aperiodic behavior.
- Quasiperiodic oscillations;Mixed-mode oscillations;Dynamic simulation
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