On the Apparent Compensation Effect Found for Two Consecutive Reactions |
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Authors: | Budrugeac P Segal E |
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Institution: | (1) Research and Development Institute for Electrical Engineering, ICPE, Splaiul Unirii 313 Sector 3, Bucharest, 74204, Romania;(2) Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Elisabeta, Nr. 4–12, Bucharest, Romania |
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Abstract: | A critical analysis of the use of an overall single rate reaction equation instead of the true rate equation corresponding
to a complex process consisting in two consecutive reactions is presented. In accordance with this approximation, often used
in the kinetic analysis of the system in which several reactions take place, the overall process is described by the apparent
activation parameters (the apparent activation energy, E
ap, and the apparent pre-exponential factor, A
ap) and the apparent conversion function.
The theoretical isotherms (α=α(t), where a is the conversion degree and t is the time) have been simulated for a system in which two consecutive reactions occur. In this case, the apparent activation
parameters depends on: (a) the considered range of the temperature; (b) the temperature, for a given conversion degree. It
is shown that the apparent activation parameters are corrrelated by the compensation effect relationship: lnA
ap=α*+β*E
ap where α* and β* are the parameters of the linear regression.
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 July 2006 with corrections to the Cover Date. |
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Keywords: | apparent compensation effect consecutive reactions isothermal kinetics |
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