Abstract
A general model describes the pore structure, mass transport and heterogeneous chemistry which occurs during the oxidation of porous coal char. The pore structure is depicted as a collection of pore trees, with a continuous size distribution and branching sequence. Oxygen diffuses into the pore tree and consumes carbon from the walls of the pores. The basic heterogeneous rate constants have been inferred from existing laboratory data on non-porous carbon and the char oxidation model is validated with data on porous carbon char.
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