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The kinetic compensation effect in the decomposition of calcium carbonate

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Abstract

Some specific factors which may cause the kinetic compensation effect (k.c.e.) during the decomposition of CaCO3 are identified. The role of the CO2 equilibrium pressure is examined in relation to the k.c.e. The article also shows why non-isothermal experiments must sometimes necessarily yield a value of activation energy different from the value obtained from isothermal experiments.

Zusammenfassung

Einige spezifische Faktoren, welche den sogenannten kinetischen Kompensationseffekt (k. c. e.) während der Zersetzung von CaCO3 herbeiführen können, werden identifiziert. Die Rolle des Gleichgewichtsdruckes des CO2 wird im Zusammenhang mit dem k. c. e. geprüft. Der Beitrag zeigt, warum die nicht-isothermen Versuche manchmal zwangläufig zu einem von den isothermen Versuchen abweichenden Wert der Aktivierungsenergie führen.

Резюме

Установлены некотор ые специфические фак торы, вызывающие так назыв аемый кинетический компен сационный эффект (к. к. э) при разложении карбонат а кальция. Исслед ована роль давления С О2 в равновесной сист еме по отношению к к. к. э. Пока зано, что вследствии чего неиз отермические измере ния иногда дают значения энерги и активации, отличающиеся от знач ений, полученных при изотермически измер ениях.

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Abbreviations

A :

Pre-exponential factor in Arrhenius expression

A′ :

Apparent value ofA

C :

Concentration of CO2 in bulk gas

C e :

Concentration of CO2 at gas/solid interface at equilibrium

E :

Activation energy

E′ :

Apparent value of activation energy

k :

Rate constant

p :

Partial pressure of CO2 in bulk gas

p e :

Equilibrium partial pressure of CO2

r 0 :

Radius of particles (all assumed spherical and uniform)

R :

The gas constant

T :

Temperature, K

References

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Indian Institute of Technology, 721302, Kharagpur, India

    H. S. Ray

Authors
  1. H. S. Ray
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Ray, H.S. The kinetic compensation effect in the decomposition of calcium carbonate. Journal of Thermal Analysis 24, 35–41 (1982). https://doi.org/10.1007/BF01914797

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  • DOI: https://doi.org/10.1007/BF01914797

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