Give an example for heterogeneous catalysis.

Explanation

Reactant molecules adsorb on the surface of the catalyst, there by increasing the concentration of the various reactant molecules on the surface of the catalyst.
* Adsorption being exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction.
* Occurane of chemical reaction on the catalyst's surface through the formation of an intermediate between catalyst and reactants.
* Desorption of reaction products from the catalyst surface and thereby making the surface available again for more reaction to occur.