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Journal of thermal analysis

, Volume 33, Issue 2, pp 503–509 | Cite as

Thermal decompositions of ammonium and potassium alums

  • R. Wojciechowska
  • W. Wojciechowski
  • J. Kamiński
Solid State Reactions

Abstract

Simultaneous TG, DTG and DTA studies of NH4Al(SO4)2.12H2O and KAl(SO4)2.12H2O under nonisothermal conditions were performed with a derivatograph, over the temperature range from 293 K to 1473 K under air and argon atmospheres. Appropriate chemical reactions were attributed to the thermal effects, with consideration to the results of X-ray diffraction and microscopic analyses. From the recorded curves, the activation energiesEa were calculated for all steps of the thermal decomposition reactions.

Keywords

Polymer Atmosphere Ammonium Potassium Argon 
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.

Zusammenfassung

Simultane TG-DTG-DTA-Untersuchungen von NH4Al(SO4)2.12H2O und K.Al(SO4)2.12H2O wurden unter nicht-isothermen Bedingungen mit einem Derivatographen von 293–1473 K an Luft und unter Argon durchgeführt. Den thermischen Effekten werden chemische Reaktionen zugordnet, wobei Röntgenbeugungs- und mikroskopische Ergebnisse berücksichtigt werden. Aus den thermoanalytischen Messkurven werden Aktivierungsenergien der Zersetzungsreaktionen berechnet.

Резюме

С помощью дериватогр афа проведены совмещенные ТГ, ДТГ и Д ТА исследования NH4Al(SO4)2.12Н2О и KAl(SO4)2.12Н2О в неизо термических условиях в атмосфере воздуха и аргона в интервале те мператур 293–1473 К. На основ е рентгенофазового и м икроскопического анализа, происходящи е химические реакции были отнесены к соответст вующим термическим эффектам. На основани и измеренных кривых б ыли вычислены энергии ак тивации Еa для всех стадий термического разложения.

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References

  1. 1.
    J. Kamiński and R. Wojciechowska, Materials Science, 3 (1980) 79.Google Scholar
  2. 2.
    A. B. Phadnis and V. V. Deshpande, Thermochim. Acta, 62 (1983) 362.CrossRefGoogle Scholar
  3. 3.
    B. C. Lippens, Physical and Chemical Aspects of Adsorbents and Catalysts, Acad. Press, London-New York 1970.Google Scholar

Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1988

Authors and Affiliations

  • R. Wojciechowska
    • 1
  • W. Wojciechowski
    • 1
  • J. Kamiński
    • 1
  1. 1.Institute of Inorganic Chemistry and Metallurgy of Rare ElementsPolytechnical University of WrocławWrocł awPoland

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