On the Apparent Compensation Effect Observed for Two Consecutive Reactions |
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Authors: | P Budrugeac E Segal |
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Institution: | (1) ICPE -, Research and Development Institute for Electrical Engineering, Splaiul Unirii 313 Sector 3, Bucharest, 73204;(2) Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest Bd, Republicii, Nr. 13, Bucharest, Romania |
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Abstract: | A critical analysis is presented of the use of an overall single rate reaction equation instead of the true rate equation
corresponding to a complex process consisting of two consecutive reactions. In accordance with this approximation, which is
often used in the kinetic analysis of systems in which several reactions take place, the overall process is described by apparent
activation parameters (the apparent activation energy Eap and the apparent pre-exponential factor Aap) and an apparent conversion function.
The theoretical isotherms (α=α(t), where α is the conversion degree and t is time) were simulated for a system in which two
consecutive reactions occur. In this case, the apparent activation parameters depend on (a) the considered range of temperature;
and (b) the temperature for a given conversion degree. It is shown that the apparent activation parameters are correlated
by the compensation effect relationship: ln Aap = α* + β*Eap where α* and β* are the linear regression parameters.
The possibility of using the apparent kinetic parameters to predict the isotherms α=α(t) for temperatures lower than those
for which these parameters were evaluated is discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | apparent compensation effect consecutive reactions isothermal kinetics |
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