Advertisement

Chinese Science Bulletin

, Volume 56, Issue 12, pp 1278–1284 | Cite as

Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

  • ShengLi Niu
  • KuiHua Han
  • ChunMei LuEmail author
Open Access
Article Engineering Thermophysics

Abstract

Calcium propionate (CP) is shown to be useful for simultaneous SO2/NO reduction in coal-fired power plants and its thermal decomposition characteristics are measured by thermogravimetric analysis in a feasibility study into more complete reduction of these hazardous gases. Calcium carbonate (CC), which has been used primarily for in-furnace desulfuration, was used for comparison. The thermal decomposition of this organic calcium-based sorbent began at low temperature, i.e. the carboxylic radical was evaporated from 565 K to 759 K for CP and the corresponding mass loss percentage was 47.79%. The residual was subsequently decomposed to release carbon dioxide between 843 K and 1012 K. The latter phase of the process occurred more readily than with CC because of the loose structure of CP resulting from evaporation of the carboxylic radical in the low temperature zone, which could be seen directly by scanning electron microscope. The maximum mass loss rates of this phase occurred at temperatures of 972 K and 1012 K for CP and CC, respectively. The Ozawa-Flynn-Wall method was used to calculate the activation energy during the thermal decomposition process at heating rates of 5, 7.5, 10 and 15 K/min. The result further confirmed the multistage characteristic of CP thermal decomposition, which could be seen in differential thermogravimetry curves. The reaction orders of CP in the conversion range 20%–80%, calculated using the Avrami theory were from 0.061 to 0.608, smaller than those of CC, which were 1.647 to 2.084.

Keywords

thermogravimetric thermal decomposition calcium propionate activation energy reaction order 

References

  1. 1.
    Han K H, Lu C M, Cheng S Q, et al. Effect of characteristics of calcium-based sorbents on the sulfuration kinetics. Fuel, 2005, 84: 1933–1939CrossRefGoogle Scholar
  2. 2.
    Niu S L, Han K H, Lu C M. Experimental study on the effect of urea and additive injection for controlling nitrogen oxides emissions. Environ Eng Sci, 2010, 27: 47–53CrossRefGoogle Scholar
  3. 3.
    Patsias A A, Nimmo W, Gibbs B M, et al. Calcium-based sorbents for simultaneous NOx/SOx reduction in a down-fired furnace. Fuel, 2005, 84: 1864–1873CrossRefGoogle Scholar
  4. 4.
    Li Y J, Zhao C S, Chen H C, et al. Modified CaO-based sorbent looping cycle for CO2 mitigation. Fuel, 2009, 88: 697–704CrossRefGoogle Scholar
  5. 5.
    Nimmo W, Patsias A A, Hampartsoumian E, et al. Simultaneous reduction of NOx and SO2 emissions from coal combustion by calcium magnesium acetate. Fuel, 2004, 83: 149–155CrossRefGoogle Scholar
  6. 6.
    Nimmo W, Patsias A A, Hampartsoumian E, et al. Calcium magnesium acetate and urea advanced reburning for NO control with simultaneous SO2 reduction. Fuel, 2004, 83: 1143–1150CrossRefGoogle Scholar
  7. 7.
    Otero M, Gomez X, Garcia A I, et al. Effects of sewage sludge blending on the coal combustion: A thermogravimetric assessment. Chemosphere, 2007, 69: 1740–1750CrossRefGoogle Scholar
  8. 8.
    Chang Y, Bai Y P, Teng B, et al. A new drug carrier: Magnetite nanoparticles coated with amphiphilic block copolymer. Chinese Sci Bull, 2009, 54: 1190–1196CrossRefGoogle Scholar
  9. 9.
    Fan C L, Li W, Li X, et al. Efficient photo-assisted Fenton oxidation treatment of multi-walled carbon nanotubes. Chinese Sci Bull, 2007, 52: 2054–2062CrossRefGoogle Scholar
  10. 10.
    O’Connell C A, Dollimore D. A study of the decomposition of calcium propionate, using simultaneous TG-DTA. Thermochim Acta, 2000, 357: 79–87CrossRefGoogle Scholar
  11. 11.
    Barkia H, Belkbir L, Jayaweera S A A. Non-isothermal kinetics of gasification by CO2 of residual carbon from timahdit and tarfay oil shale kerogens. J Therm Anal Calorim, 2004, 76: 623–632CrossRefGoogle Scholar
  12. 12.
    Yagmur S, Durusoy T. Kinetics of the pyrolysis and combustion of Goynuk oil shale. J Therm Anal Calorim, 2006, 86: 479–482CrossRefGoogle Scholar
  13. 13.
    Sheibani S, Ataie A, Heshmati-Manesh S. Kinetics analysis of mechano-chemically and thermally synthesized Cu by Johnson-Mehl-Avrami model. J Alloy Compd, 2008, 455: 447–453CrossRefGoogle Scholar
  14. 14.
    Shen W, He H P, Zhu J X, et al. Preparation and characterization of 3-aminopropyltriethoxysilane grafted montmorillonite and acid-activated montmorillonite. Chinese Sci Bull, 2009, 54: 265–271CrossRefGoogle Scholar
  15. 15.
    Niu S L, Lu C M, Han K H, et al. Thermogravimetric analysis of combustion characteristics and kinetic parameters of pulverized coals in oxy-fuel atmosphere. J Therm Anal Calorim, 2009, 98: 267–274CrossRefGoogle Scholar
  16. 16.
    Tang P, Zhao Y C, Xia F Y. Thermal behaviors and heavy metal vaporization of phosphatized tannery sludge in incineration process. J Therm Anal Calorim, 2009, 20: 1146–1152.Google Scholar
  17. 17.
    Kok M V. Temperature-controlled combustion and kinetics of different rank coal samples. J Therm Anal Calorim, 2005, 79: 175–180CrossRefGoogle Scholar
  18. 18.
    Otero M, Calvo L F, Gil M V, et al. Co-combustion of different sewage sludge and coal: A non-isothermal thermogravimetric kinetic analysis. Bioresource Technol, 2008, 99: 6311–6319CrossRefGoogle Scholar
  19. 19.
    Simon P, Thomas P S, Okuliar J, et al. An incremental integral isoconversional method: Determination of activation parameters. J Therm Anal Calorim, 2003, 72: 867–874CrossRefGoogle Scholar
  20. 20.
    Ramajo-Escalera B, Espina A, Garcia J R, et al. Model-free kinetics applied to sugarcane bagasse combustion. Thermochim Acta, 2006, 448: 111–116CrossRefGoogle Scholar
  21. 21.
    Ruitenberg G, Woldt E, Petfor-Long A K. Comparing the Johnson-Mehl-Avrami-Kolmogorov equations for iosthermal and linear heating conditions. Thermochim Acta, 2001, 378: 97–105CrossRefGoogle Scholar
  22. 22.
    Lu M G, Shim M J, Kim S W. Curing behavior of an unsaturated polyester system analyzed by Avrami equation. Thermochim Acta, 1998, 323: 37–42CrossRefGoogle Scholar
  23. 23.
    Jiang X M, Cui Z G, Han X X, et al. Thermogravimetric investigation on combustion characteristics of oil shale and high sulphur coal mixture. J Therm Anal Calorim, 2006, 85: 761–764CrossRefGoogle Scholar
  24. 24.
    Nimmo W, Patsias A A, Hall W J, et al. Characterization of a process for the in-furnace reduction of NOx, SO2 and HCl by carboxylic salts of calcium. Ind Eng Chem Res, 2005, 44: 4484–4494CrossRefGoogle Scholar
  25. 25.
    Han D H, Sohn H Y. Calcined calcium magnesium acetate as a superior SO2 sorbent: I. Thermal decomposition. AICHE J, 2002, 48: 2971–2977CrossRefGoogle Scholar
  26. 26.
    Ozbas K E, Kok M V, Hicyilmaz C. Comparative kinetic analysis of raw and cleaned coals. J Therm Anal Calorim, 2002, 69: 541–549CrossRefGoogle Scholar
  27. 27.
    Calvo L F, Otero M, Jenkins B M, et al. Heating process characteristics and kinetics of the rice straw in different atmospheres. Fuel Process Technol, 2004, 85: 279–291CrossRefGoogle Scholar
  28. 28.
    Doyle C D. Kinetic analysis of thermogravimetric data. J Appl Polym Sci, 1961, 5: 285–292CrossRefGoogle Scholar

Copyright information

© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  1. 1.National Engineering Laboratory for Coal-Burning Pollutants Emission ReductionShandong UniversityJinanChina

Personalised recommendations