Differentiate between homogeneous and heterogeneous catalysis with one example of each.

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Homogeneous catalysis
Heterogeneous catalysis
1. In this process, the catalyst and reactants are present in the same phase. 1. In this process, the catalyst and reactants are present in a different phases.
2. They have high activity. 2. They have low activity.
3. Their separation is difficult. 3. Their separation is easy.
4. They are not diffusion controlled. 4. Maybe diffusion controlled.
5. Expensive and difficult to recycle. 5. Readily regenerated and recycled.
6. Example, $\underset{Sulphur dioxide}{2 {SO}_{2} (g)} + \underset{Oxygen}{O_{2} (g)} \overset{NO (g)}{\to} \underset{Sulphur trioxide}{2 {SO}_{3} (g)}$ 6. Example, $\underset{Nitrogen}{N_{2} (g)} + \underset{Oxygen}{O_{2} (g)} \overset{Fe (s)}{\to} \underset{Nitrogen trioxide}{2 {NO}_{3} (g)}$

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Homogeneous catalysis	Heterogeneous catalysis
1. In this process, the catalyst and reactants are present in the same phase.	1. In this process, the catalyst and reactants are present in a different phases.
2. They have high activity.	2. They have low activity.
3. Their separation is difficult.	3. Their separation is easy.
4. They are not diffusion controlled.	4. Maybe diffusion controlled.
5. Expensive and difficult to recycle.	5. Readily regenerated and recycled.
6. Example, $\underset{Sulphur dioxide}{2 {SO}_{2} (g)} + \underset{Oxygen}{O_{2} (g)} \overset{NO (g)}{\to} \underset{Sulphur trioxide}{2 {SO}_{3} (g)}$	6. Example, $\underset{Nitrogen}{N_{2} (g)} + \underset{Oxygen}{O_{2} (g)} \overset{Fe (s)}{\to} \underset{Nitrogen trioxide}{2 {NO}_{3} (g)}$