Kinetics of SO2‐Dolomite Reaction: Application of Random Pore Model

Dolomite [CaMg(CO3)2] slabs were exposed to 8.0, 14.05, and 20.88 ppm SO2 atmosphere in several experiments, and the conversion-time data were evaluated in terms of the random pore model proposed by Bhatia and Perlmutter (1980). The pore volume, pore surface area, and the pore length required for the application of the model were estimated from the mercury intrusion porosimeter measurements. The experimental conversion-time data were fitted to obtain the surface reaction rate constant as 4.90×10-6cm2.98/mmol0.66h and the reaction order as 0.66. With the help of these two reaction parameters, it was possible to predict the porosity increase due to reaction. Results compare well with experimental values.