Advertisement

Science in China Series B: Chemistry

, Volume 40, Issue 2, pp 152–160 | Cite as

Nonlinear chemical reaction between Na2S2O3 and Peroxide compound

  • Qingyu Gao
  • Yaomin Wang
  • Guichang Wang
  • Songlin Zhang
  • Yaru Zang
  • Xuezhuang Zhao
Article

Abstract

Kinetics of reaction between Na2S203 and peroxide compound (H202 or Na2S2O3) in a batch reactor and in a continuous stirring tank reactor (CSTR) were studied. Steady oscillations in uncatalyzed reactions in a CSTR were first discovered. In Na2S203-H2O2-H2S04 reaction system, Pt potential and pH of higher and lower flow rates beyond oscillation flow rates were in around the same extreme values. The reaction catalyzed by Cu2+ consists of the catalyzed oscillation process and the uncatalyzed osciliation one. On the basis of experiment, a reaction mechanism consisting of three stages was put forward. The three stages are H+ positive-feedback reactions, proton negative-feedback (uncatalyzed negative-feedback and catalyzed negative-feedback) reactions and transitional reactions. The mechanism is able to explain reasonably the nonlinear chemical phenomena appearing in the thiosulfate oxidation reaction by peroxide compounds.

Keywords

sodium thiosulfate nonlinearity reaction mechanism kinetics model 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Orban, M., Epstein, I. R., The minimal permanganate oscillator and some derivates oscillator oxidation of S202- 3, SO2- 3, and S2- by pennanganate in a CSTR,J. Am, Chem. Soc., 1990, 112: 1812.CrossRefGoogle Scholar
  2. 2.
    Rabai, G., Beck, M. T. Kenneth, K.et al., Sustained and damped pH oscillation in the perodate-thiosulfate reaction in a CSTR,J. Phys. Chem., 1989, 93: 2853.CrossRefGoogle Scholar
  3. 3.
    Orban, M., Epstein, I. R., Chemical oscillators in group VIA: The Cu(II)-catalyzed reaction between hydrogen peroxide and Thiosulfateion,J. Am. Chem. Soc., 1987, 109: 101.CrossRefGoogle Scholar
  4. 4.
    Orban, M., Epstein, I. R., Chemical oscillators in group VIA: The Cu(II)-catalyzed reaction between thiosulfate ion and peroxodisulfate ions,J. Am. Chem. Soc., 1989, 111: 2897.Google Scholar
  5. 5.
    Luo, Y., Epstein, I. R., A general model for pH oscillators,J. Am. Chem. Soc., 1990, 113: 1518.CrossRefGoogle Scholar
  6. 6.
    Orban, M., Epstein, I. R., A new halogen-free chemical oscillator: The reaction between sulfide ion and hydrogen peroxide in a CSTR,J. Am. Chem. Sac., 1985, 107: 2302.CrossRefGoogle Scholar
  7. 7.
    Gao Qingyu, Wang Yuemin, Zang Yaruet al., The nonlinear phenomena of the reactions between sulfur compound and hydrogen Peroxide,Acta Physico-chimica Sinicu (in Chinese), 1996, 12: 1.Google Scholar
  8. 8.
    Abel, E., Kinetics and catalysis of the reaction between hydrogen peroxide and thiosulfate,Monotcsh. Chem., 1907, 28: 1239.CrossRefGoogle Scholar
  9. 9.
    Fava, A., Bresadola, S., Kinetics of the catalytic rearrangement of tetrathionate,J. Am. Chem. Soc., 1995, 77: 5792.CrossRefGoogle Scholar
  10. 10.
    Naito, K., Shieh, M. C., Okabe, T., The chemical behavior of low valence sulfur compounds (V): Decomposition and oxidation of tetrathionate in aquous ammonia solution,Bulletin of the Chemical Society of Japan, 1970, 43: 1372.CrossRefGoogle Scholar
  11. 11.
    Takizawa, M., Okuwaki, A., Okabe, T., The chemical behavior of low valence sulfur compounds ( VII ): The oxidation of sodium thiosulfate with ozone,Bulletin of the Chemical Society of Japan, 1973, 46: 3785.CrossRefGoogle Scholar
  12. 12.
    Rabai, G., Orban, M., Epstein, I. R., Design of pH-regulated oscillators,Acc Chem. Res., 1990, 23: 258.CrossRefGoogle Scholar
  13. 13.
    Luo, Y., Kustin, K., Epstein, I. R., Kinetics and mechanism of H202 decomposition catalyzed by cu2+ in alkaline solution,Inorg. Chem., 1988, 27: 2489.CrossRefGoogle Scholar
  14. 14.
    Sillen, A. I., Martell, A. E.,Stability Constants of Metal-ion Complexes; Special Publication No.17, London: Chemical Society. 1964.Google Scholar
  15. 15.
    {au{fnRabai}, {gnG.}}, {au{fnEpstein}, {gnI. R.}}, {atEquilibria and kinetics of the fast interaction between copper(II) and thiosulfate ions in aqueous solution}, {jtInorg. Chem.}, {vn31} : {pp3239}.Google Scholar

Copyright information

© Science in China Press 1997

Authors and Affiliations

  • Qingyu Gao
    • 1
  • Yaomin Wang
    • 1
  • Guichang Wang
    • 1
  • Songlin Zhang
    • 1
  • Yaru Zang
    • 1
  • Xuezhuang Zhao
    • 1
  1. 1.Department of ChemistryNanki UniversityTianjinChina

Personalised recommendations