Seventeen kinds of carbons and graphites were oxidized in helium flow containing 0.65% of water vapor or carbon dioxide in the temperature range from 800 to 1000°C.The rate of reaction with carbon dioxide was relatively equal to that with water vapor.Correlations between the rates and some characters such as the concentrations of impurity contained in the materials and their X ray parameters of structure were also investigated.Only the concentrations of iron impurity were related to the rates, and the total of the concentrations of iron and those of titanium, vanadium and nickel were more closely related to the rates.The compensation effects, which are characteristic to catalytic reaction, were found to exist between the activation energies for the reactions and the pre-exponential factors.Iso kinetic temperatures, at which all catalysts lose their effect, were 1550°K for the reaction with water vapor and 1380°K for the reaction with carbon dioxide.
