Abstract
A structural model is presented for the non-catalytic reaction between a porous solid and a gas stream. The model incoporates parameters such as solid grain size, porosity, effective pore diffusion coefficient and allows the quantitative assessment of the role played by these in determining the overall reaction rate. The model was found to predict reasonably well the reaction of porous nickel oxide pellets with hydrogen within an intermediate temperature range. In the paper an approximate allowance is made for the effects of sintering and it is suggested that there may exist an optimum combination of grain size, porosity and reaction temperature which would give the fastest overall reaction rate.
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