Abstract
A basic study is made of determination of the effect of the heating rate selected in calorimetry working in the scanning mode on the values obtained for the kinetic parameters. The general problem is complicated by the fact that the rate of heat transfer through the sample is generally very low, and this can become a limiting factor if the heating rate is too high. As a result, gradients of temperature are developed within the sample, especially when the reaction takes place. The temperature in the sample can be very different from that of the calorimeter. Moreover, this increase in temperature in the sample provokes an abnormal increase in the reaction rate. Thus, the kinetic parameters determined from the usual methods (such as that of Freeman-Carroll), which do not take into account the heat transfer may be incorrect, if the value selected for the heating rate is too high. The right value for the heating rate must be chosen by considering the enthalpy of reaction, the size of the sample, and the thermal properties of the material.
Published Version
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