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Change of the Apparent Reaction Order with Temperature as a Consequence of the Reaction Mechanism Complexity

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Abstract

The theoretical isotherms (α=α(t), where α is the conversion degree and t is the time) and the theoretical thermogravimetric curves(α=α(T), where T is the temperature) were simulated for a system in which two consecutive reactions occur. A critical analysis of the use of an overall single rate reaction equation instead of the use of the true rate equations is presented. Both for isothermal and non-isothermal data and α≤0.50, the apparent reaction order depends on temperature. It is pointed out that the apparent reaction order for a given temperature can be evaluated if the parameters of the compensation effect are known.

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Authors and Affiliations

  1. ICPE — Research and Development Institute for Electrical Engineering, 313 Splaiul Unirii, Sector 3, RO-74204, Bucharest, Romania

    P. Budrugeac

  2. LACECA Research Center, 95 Siret Str., Sector 1, RO-78308, Bucharest, Romania

    C. Popescu

  3. Faculty of Chemistry, Department of Physical Chemistry, University of Bucharest, Bd. Elisabeta 4-12, Sector 1, Bucharest, Romania

    E. Segal

Authors
  1. P. Budrugeac
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  2. C. Popescu
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  3. E. Segal
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Budrugeac, P., Popescu, C. & Segal, E. Change of the Apparent Reaction Order with Temperature as a Consequence of the Reaction Mechanism Complexity. Journal of Thermal Analysis and Calorimetry 64, 821–827 (2001). https://doi.org/10.1023/A:1011521201269

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  • DOI: https://doi.org/10.1023/A:1011521201269

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