Abstract
A NUMBER of articles have been published dealing with the differential thermal analysis (DTA) of chemical reaction kinetics1–5. Only one of these, however, gives a direct method for determining the activation energy (E) of the chemical reaction4. In this method, DTA curves are recorded at several different rates of heating. The results are then plotted as ln b/Tm2 against 1/Tm, where Tm is the peak temperature in ° K (the temperature of point B, Fig. 1), and b is the rate of heating. The magnitude of E is calculated from the angle between this straight line and the abscissa. This procedure has two principal shortcomings: (1) it is necessary to record several DTA curves with various rates of heating; and (2) it is necessary to use a special programming device to control the temperature. This device must be capable of providing linear heating at a number of rates of heating. The latter condition imposes serious technical difficulties, because all the DTA apparatuses at present available are adjusted for only one rate of heating.
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