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Somewhere between fiction and reality

The usefulness of kinetic data of solid-state reactions

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Abstract

The influence of various experimental conditions such as sample weight, atmosphere and heating rate on the decomposition of NH4VO3, CaCO3 and V2O5 has been investigated. Results obtained clearly indicate that the course of the reactions and — in turn — the kinetic parameters, are not intrinsic to the particular compound and that they characterize rather the combination of experimental conditions and investigated compound. Such a situation makes it almost impossible to choose ‘standard conditions’ for the calculation of kinetic parameters, because under different circumstances quite different reaction-pathways can occur.

Zusammenfassung

Es wurde der Einflu\ verschiedener experimenteller Bedingungen (z.B. Probenmasse, Atmosphäre, Aufheizgeschwindigkeit) auf die Zersetzung von NH4VO3, CaCO3 und V2O5 untersucht. Die Ergebnisse zeigen eindeutig, da\ Reaktionsweg und kinetische Parameter in Wirklichkeit nicht die einzelne Verbindung charakterisieren, sondern eher die Kombination von experimentellen Bedingungen und untersuchter Verbindung. Hierdurch ist es meistens unmöglich, “Standardbedingungen≓ zur Berechnung kinetischer Parameter zu wählen, da unter verschiedenen Umständen ganz andere Reaktionswege beschritten werden können.

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Authors and Affiliations

  1. Department of Industrial and Engineering Chemistry, Swiss Technical Institute of Technology, CH-8092, Zürich, Switzerland

    M. Maciejewski

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  1. M. Maciejewski
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On leave from Warsaw University of Technology, Warsaw, Poland.

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Maciejewski, M. Somewhere between fiction and reality. Journal of Thermal Analysis 38, 51–70 (1992). https://doi.org/10.1007/BF02109108

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