Abstract
The variation with temperature and oxygen concentration of the oxidation rate of large tubular specimens of graphite exposed to oxidising gas on the bore surface has been examined. Temperatures in the range 550–675°C and oxygen concentrations between 2.5 and 20.8 per cent were studied. Under these conditions the overall rate of reaction is controlled by the rate of in pore mass transport. A previously reported mathematical model is extended to interpret these results. The experimental results yield an apparent energy of activation of 25.0 kcal/g atom and an apparent order of 0.81. Calculations based on the extended model give a true energy of activation for the graphite—oxygen reaction of 48.6 k cal/g atom and an order of reaction of 0.62.
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