Kinetic model for gas-solid non-catalytic reaction

According to the studies on reduction of fused iron catalysts following three premises can be established primarily.  

0 The external shape and volume of particle do not change when the particle is reduced, and the pore structures are generated by removal of oxygen ions. 

For gas-solid reactions, the expression of reaction rate is fully different from other systems. Therefore, the kinetic parameters are denoted as t (time for particle being fully converted). 

If a reaction is controlled by one of three types of resistance respectively, then three kinds of expressions of rates can be obtained. 

The above expressions of conversion with time are shown in Fig. 5.7. 

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