Experimental data on the kinetics of the reaction between MnO and graphite in a mixture of fine powders, obtained earlier by one of the authors, were reassessed. The principal motive was to test on this system a new kinetic model, the ''intrinsic transport'' model, published previously by the present authors. In this model, the reaction-rate-limiting step is assumed to be transport of a gaseous intermediate by pore diffusion between reaction sites on the surfaces of the reactant particles. Various other model formalisms potentially applicable to this reaction also were tested. It is shown that the intrinsic transport of CO 2 gave good to excellent fits to the experimental data over a wide range of reaction conditions. Other models gave poor agreement. It is shown, furthermore, that for the case where the CO 2 pore-diffusion path lengths were made small (fine MnO and coarse graphite particle size), thus speeding up rapid intrinsic transport, the graphite-surface reaction became rate controlling.

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