Summary of the Cumene Decomposition

Quniene Figme 10-15. From the plot in Figme 10-15 we can elearly see that neither 

The forward cmnene decomposition reaction is a single-site mechanism involving only adsorbed cumene while the reverse reaction of propylene in the gas phase reacting with adsorbed benzene is an Eley-Rideal mechanism. 

If we were to have an adsorbing inert in the feed, the inert would not participate in the reaction but would occupy sites on the catalyst surface  

Because the adsorption of the inert is at equilibrium, the concentration of sites occupied by the inert is 

Substituting for the inert sites in the site balance, the rate law for sinface reaction control when an adsorbing inert is present is 

One observes that the rate decreases as the partial pressure of inens increases. 

---