Question
What is the difference between homogeneous and heterogeneous catalysis?
| Sr. No. | Homogeneous catalysis | Heterogeneous catalysis |
| 1. | In a catalysed reaction the reactants, products and catalyst are present in the same phase. | In a reaction, the catalyst is present in a different phase. i.e., the catalyst is not present in the same phase as that of reactants and products. |
| 2. | For example, $2 SO _{2( g )}+ O _{2( g )} \stackrel{ NO _{( g )}}{\longrightarrow} 2 SO _{3( g )}$ Hence NO act as catalyst. | For example, $2 SO _{2( g )}+ O _{2( g )} \stackrel{ Pt _{( s )}}{\longrightarrow} 2 SO _{3( g )}$ Hence Pt(s) act as catalyst. |
| 3. | Homogeneous catalysis is explained by intermediate compound formation theory. | Heterogeneous catalysis is explained by adsorption theory. |
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