Journal of thermal analysis

, Volume 37, Issue 6, pp 1161–1177 | Cite as

A kinetic analysis of the pyrolysis of some australian coals by non-isothermal thermogravimetry

  • S. Ma
  • J. O. Hill
  • S. Heng


The pyrolysis of a suite of brown coal samples and bituminous coal maceral concentrates is investigated by non-isothermal thermogravimetry. The TG data for these coals reveal a two-stage pyrolysis process. The activation energy for the primary pyrolysis stage is considerably higher than that for the secondary pyrolysis stage. It is evident that a particular coal may be characterised by the weighted mean apparent pyrolysis activation energy which correlates with the corresponding specific energy of the coal.


Activation Energy Specific Energy Pyrolysis Coal Sample Brown Coal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Mittels nichtisothermer Thermogravimetrie wurde die Pyrolyse einer Reihe von Braunkohlenproben und Mazeralkonzentrate aus bituminösen Kohlen untersucht. Die TG-Daten dieser Kohlen weisen einen zweischrittigen Pyrolyseprozeß auf. Die Aktivierungsenergie für den ersten Pyrolyseschritt ist erheblich höher als die des zweiten Pyrolyseschrittes. Es ist offensichtlich, daß eine gegebene Kohle durch den gewichteten Mittelwert der scheinbaren Aktivierungsenergie der Pyrolyse charakterisiert werden kann, welcher mit der entsprechenden spezifischen Energie der Kohle korreliert.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M. A. Serageldin and W. Pan, Amer. Chem. Soc. Div. Fuel Chem., 29 (1984) 112.Google Scholar
  2. 2.
    S. Ma, J. O. Hill and S. Heng, J. Thermal Anal., 35 (1989) 977.Google Scholar
  3. 3.
    W. W. Wendlandt, ’Thermal Analysis’, Wiley-Interscience, New York 1986, p. 59.Google Scholar
  4. 4.
    J. P. Elder, J. Thermal Anal., 30 (1985) 657.Google Scholar
  5. 5.
    K. Rajeshwar, Thermochim. Acta, 45 (1981) 253.CrossRefGoogle Scholar
  6. 6.
    T. V. Lee and S. R. Beck, Amer. Ind. Chem. Eng. J., 30 (1984) 517.Google Scholar
  7. 7.
    J. M. Vargas and D. D. Perimutter, Ind. Eng. Chem. Process Des. Dev., 25 (1986) 49.CrossRefGoogle Scholar
  8. 8.
    W. Wanzl, Fuel Processing Tech., 20 (1988) 317.CrossRefGoogle Scholar
  9. 9.
    B. Pang and H. Dai, J. Fuel Chem. Tech., 17 (1989) 1.Google Scholar
  10. 10.
    S. Guo, Q. Yuan, and S. Zhu, J. Fuel Chem. Tech., 17 (1989) 55.Google Scholar
  11. 11.
    S. Ma. G. Huang and J. O. Hill, Thermochim. Acta, (1991) in press.Google Scholar
  12. 12.
    M. I. Pope and M. D. Judd, ’Differential Thermal Analysis’, Heyden, London 1977, p. 116.Google Scholar
  13. 13.
    J. Šestak and G. Berggren, Thermochim. Acta, 3 (1971) 1.CrossRefGoogle Scholar
  14. 14.
    J. W. Cumming, Fuel, 63 (1984) 436.CrossRefGoogle Scholar
  15. 15.
    W. Jander, Z. Anorg. Allgem. Chem., 163 (1927) 1.CrossRefGoogle Scholar
  16. 16.
    P. G. Shewmon, ’Diffusion in Solids’, McGraw-Hill, New York 1963.Google Scholar
  17. 17.
    S. E. Smith, R. C. Neavel, E. J. Hippo and R. N. Miller, Fuel, 60 (1981) 458.CrossRefGoogle Scholar
  18. 18.
    J. Chen and X. Sun, J. Eng. Thermophysics, 7 (1986) 172.Google Scholar
  19. 19.
    ’Chemistry of Coal Conversion’ R. H. Schlosberg, Ed., Plenum Press, New York 1985, p. 123.Google Scholar
  20. 20.
    M. R. Khan, Fuel, 66 (1987) 1626.CrossRefGoogle Scholar
  21. 21.
    C. H. Ko, D. M. Sanchez, W. A. Peters and J. B. Howard., Am. Chem. Soc. Div. Fuel Chem., 32 (1988) 112.Google Scholar
  22. 22.
    S. Guo, Q. Yuan and S. Zhu, J. Fuel Chem. and Tech., 17 (1989) 55.Google Scholar
  23. 23.
    H. E. Kissinger, J. Res. Natl. Bur. Stand., 57 (1957) 712.Google Scholar
  24. 24.
    P. Hanaba, H. Juntgen and W. Peters, Brennst. Chem., 49 (1989) 368.Google Scholar
  25. 25.
    J. P. Elder and M. B. Harris, Fuel, 63 (1984) 262.CrossRefGoogle Scholar
  26. 26.
    J. P. Elder and V. B. Reddy, Reactivity of Solids, 2 (1987) 337.CrossRefGoogle Scholar
  27. 27.
    A. M. M. Gadalla, Thermochim. Acta, 74 (1984) 255.CrossRefGoogle Scholar
  28. 28.
    H. R. Brown, J. Inst. Fuel, 30 (1957) 137.Google Scholar
  29. 29.
    J. P. Elder, Thermochim. Acta, 95 (1985) 41.CrossRefGoogle Scholar
  30. 30.
    P. H. Given and R. F. Yarzab, ’Analytical Methods for Coal and Coal Products’, C. Karr, Jr. Ed., Academic Press, New York 1978, p. 27.Google Scholar

Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1991

Authors and Affiliations

  • S. Ma
    • 1
  • J. O. Hill
    • 1
  • S. Heng
    • 2
  1. 1.Department of ChemistryLa Trobe UniversityBundooraAustralia
  2. 2.Gippsland Institute of Advanced EducationCoal Corporation of Victoria, Research FacilityChurchillAustralia

Personalised recommendations