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Thermal decompositions of ammonium and potassium alums

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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 energiesE a were calculated for all steps of the thermal decomposition reactions.

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. J. Kamiński and R. Wojciechowska, Materials Science, 3 (1980) 79.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Polytechnical University of Wrocław, 50-370, Wrocł aw, Poland

    R. Wojciechowska, W. Wojciechowski & J. Kamiński

Authors
  1. R. Wojciechowska
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  2. W. Wojciechowski
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  3. J. Kamiński
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Wojciechowska, R., Wojciechowski, W. & Kamiński, J. Thermal decompositions of ammonium and potassium alums. Journal of Thermal Analysis 33, 503–509 (1988). https://doi.org/10.1007/BF01913929

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  • DOI: https://doi.org/10.1007/BF01913929

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