Effect of the temperature and energies

As already known, both the kinetic constants and equilibrium adsorption-desorption constants depend on the temperature. However, the kinetic constant is also a function of the activation energy, following the Arrhenius equation, while the adsorption-desorption constants depend on the heat of adsorptions or desorptions, respectively, both exothermic. Thus, starting from Equation 10.26, we obtain  

Equating 10.26, after substitution of the corresponding kinetic and adsorption-desorption constants, we obtain the apparent activation energy  

As seen, the apparent activation energy involves the kinetic activation energy as well as the adsorption-desorption enthalpies of adsorbed species. The rate of a catalytic reaction is easier than for a noncatalytic reaction since the energetic barrier is lower, increasing the activity of the reaction which explains the catalytic effect. 

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