Abstract
A simple model for simultaneous isothermal noncatalytic gas-solid reactions, occurring in spherical particles either shrinking or growing with reaction, is developed. The particles are assumed to be packed following the hexagonal close-packed model and allowed to overlap. The model predicts how the surface area and porosity of the compact vary with reaction and describes the spatiotemporal evolution of solid reactant conversion as well as product selectivity. The influence of physicochemical variables on product uniformity is studied.
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