INTEGRAL METHOD TO ANALYZE THE KINETICS OF HETEROGENEOUS REACTIONS UNDER NONISOTHERMAL CONDITIONS - A VARIANT ON THE OZAWA-FLYNN-WALL METHOD

The paper describes an integral method of investigating the kinetics a nd mechanism of reactions based on the use of the degree of conversion measured at the same temperatures on curves recorded for a reaction c arried out at various heating rates. The main advantage of this method is that it is not based on any assumption concerning the temperature integral, giving, thus, a higher degree of precision to the results. S ince it is an integral method, the results are expected to be less aff ected by experimental errors. The method also allows the computation o f the pre-exponential factor, A, and of the activation energy, E, if t he Arrhenius-type relationship is assumed for the rate constant. The a pproach may be considered as a variant on the Ozawa-Flynn-Wall method. Theoretical considerations are verified on two sets of generated data from the literature, as well as on the experimental data acquired for the calcium oxalate dehydration reaction.