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

Author： Budrugeac P.   Popescu C.   Segal E.  

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.64, Iss.2, 2001-05, pp. : 821-827

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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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