Abstract
During the course of most gas—solid non-catalytic reactions the solid undergoes structural changes caused primarily by swelling or shrinkage, due to the chemical reaction, or by sintering. In this paper a theory is developed to account for the effects of such structural changes on the conversion—time relationship and on temperature profiles in the pellet. The theory is based on the particle pellet concept and accounts for differences in density between reactant and product solids and for changes of porosity and pore interconnections due to sintering. The rate of sintering is assumed to obey an Arrhenius-type equation. Predicted conversion—time and temperature—time—position curves based upon the theory are compared with experimental results for the hydrofluorination of pellets of uranium dioxide.
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