Question

What role does adsorption play in heterogeneous catalysis?

Answer 1

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⭐ Role of adsorption in acatalytic reaction. The role ofheterogeneous catalysis has been explained on the basis of adsorptiontheory postulated by Faraday.

According to it: Due to unsatisfied valences forces on the catalystsurface, the molecules of the gaseous reactants get adsorbed in unimolecular layer.




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Answer 2

Answer:

Heterogeneous catalysis:  It is catalytic process which involves the presence of catalyst and reactants in different phases. The adsorption theory explains this type of heterogeneous catalytic action. The mechanism of catalysis involves the following steps:

(i) The reactant molecules are adsorbed on the catalyst surface.

(ii) The formation of an intermediate is caused by occurrence of a chemical reaction.

(iii) The products are desorped from the catalyst surface

(iv) The products are diffused away from the catalyst surface.

In this process, the catalyst is present in the solid state and the reactants are usually present in the gaseous state. Gaseous molecules are then adsorbed on the surface of the catalyst. The rate of reaction increases when the concentration of reactants on the surface of the catalyst increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants.