Homogeneous and Heterogeneous Catalysis

On the basis of the number of phases present in the reaction mixture, the phenomenon of catalysis can be divided into two main types:

1. Homogeneous catalysis
2. Heterogeneous catalysis

Homogeneous Catalysis

When the catalyst is present in the same phase as the reactants, the phenomenon is called homogeneous catalysis.

Heterogeneous Catalysis

When the catalyst is present in a phase other than that of reactants the phenomenon is called heterogeneous catalysis.