"The intrinsic kinetics, unaffected by diffusional and mass transfer effects, of the oxidation of oil shale carbonaceous residue have been determined. For samples with undecomposed carbonate minerals, the activation energy is 22.06 kcal/g-mole. The activation energy remains essentially the same when the carbonate minerals in the sample are decomposed and then recarbonated. The oxidation rate shows first-order dependences on the oxygen partial pressure and the amount of unreacted char. It has also been shown that a nonisothermal method with linearly increasing temperature provides a useful technique for determining the intrinsic kinetics of gas-solid reactions."