Skip to main content

Effect of pyrolysis temperature of the catalytic activity of active carbon+cobalt phthalocyanine in sulfur dioxide oxidation by oxygen


Structural changes during the pyrolysis of the catalyst ‘active carbon+cobalt phthalocyanine’ (Ac+CoPc) in the temperature range 500–800°C are investigated using infrared spectroscopy, XRD and DTG analysis. The decomposition products contain organic residues of the phthalocyanine rings and separate phases of CO3O4 and β-Co. The effect of pyrolysis temperature on: (i) the chemical stability of Co in the pyrolyzed CoPc in 0.5M H2 SO4; (ii) the electrocatalytic activity for oxidation of SO2 by oxygen; and (iii) the partial electrochemical reactions of SO2 oxidation and oxygen reduction, has been studied. The rate of electrochemical oxidation of SO2 is affected only by the active centres formed on pyrolysis of the chelate rings. The presence of Co at lower pyrolysis temperatures decreases the oxygen diffusion limitations. It is shown that the rate of SO2 oxidation by oxygen is limited by mass transport of oxygen.

This is a preview of subscription content, access via your institution.


  1. O. A. Levina and K. A. Radyushkina, USSR Patent 542 416 (1976).

  2. V. S. Bagotski, M. H. Tarasevich, O. A. Levina, K. A. Radyushkina and S. I. Andruseva, J. Power Sources 2 (1977/78) 233.

    Google Scholar 

  3. H. Janhke, M. Schonborn and G. Zimmermann, Topics in current Chemistry 61 (1976) 133.

    Google Scholar 

  4. K. Petrov, I. Nikolov and T. Vitanov, Int. J. Hydrogen Energy 9 (1984) 901.

    Google Scholar 

  5. K. Okabayashi, O. Ikeda and H. Tamura, Chem. Lett. (1982) 1659.

  6. J. A. R. van Veen, J. F. van Bar and C. J. Kroese, J. Chem. Soc. Faraday Trans. 1 77 (1981) 2827.

    Google Scholar 

  7. A. van der Putten, A. Elzing, W. Vischer and E. Barendrecht, J. Electoanal. Chem. 205 (1986) 233.

    Google Scholar 

  8. G. Grunig, K. Wiesener, S. Gamgurtsev and A. Kaisheva, I. Iliev, J. Electroanal. Chem. 159 (1983) 155.

    Google Scholar 

  9. K. Wiesener, Electrochimiya 18 (1982) 758.

    Google Scholar 

  10. I. Nikolov, K. Petrov and T. Vitanov, J. Appl. Electrochem., in press.

  11. T. Vitanov, E. Budevski, I. Nikolov, K. Petrov, V. Naidenov and Ch. Chirstov, I. Chem. Eng. Symp. Series, Leeds, UK, no, 116 (1990).

  12. W. Douglas, US Patent, 4 049 572 (1977)

  13. V. Minkova, M. Razvigorova, M. Goranova, L. Lutzkanov and G. Angelova, Fuel 70 (1991) 713.

    Google Scholar 

  14. I. Iliev, S. Gamgurtsev, A. Kaisheva, E. Vakanova, I. Mukhovski and E. Bedevski, Commun. Dept. Chem. Bulg. Acad. Sci. 7 (1974) 223.

    Google Scholar 

  15. I. Iliev, P. Atanasov, S. Gamgurtsev and A. Kaisheva, 28th Intersoc. Energy Conversion Engineering Conference, 8-113, Atlanta, USA (1993).

  16. A. Kaisheva, I. Iliev and S. Gamgurtsev, J. Power Sources 13 (1994) 181.

    Google Scholar 

  17. A. Kaisheva, S. Gamgurtsev and I. Iliev, Electrochimija 18 (1982) 139.

    Google Scholar 

Download references

Author information

Authors and Affiliations


Rights and permissions

Reprints and Permissions

About this article

Cite this article

NIKOLOV , I., VITANOVA , I., NAJDENOV , V. et al. Effect of pyrolysis temperature of the catalytic activity of active carbon+cobalt phthalocyanine in sulfur dioxide oxidation by oxygen. Journal of Applied Electrochemistry 27, 77–82 (1997).

Download citation

  • Issue Date:

  • DOI:


  • Pyrolysis
  • Active Carbon
  • Phthalocyanine
  • Sulfur Dioxide
  • Oxygen Reduction