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What is the difference between physisorption and chemisorption?

5.2  What is the difference between physisorption and chemisorption?

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M manish

Difference between physisorption and Chemisorption-

Physisorption Chemisorption

1. Happens due to van der Waal forces.

2. It's not specific in nature and reversible in nature.

3. It depends on the nature of the gas. More liquefiable gas is adsorbed easily.

4. enthalpy of adsorption is low around 20-40 kJ/mol

5. Low temperature required

6. It depends on the surface area. Higher the area high in the process rate.

7. Results in multimolecular layers on the adsorbent surface.

1. Caused by a chemical bond

2. highly specific in nature and irreversible.

3. depend on the nature of the gas. those gases can react with the adsorbent show chemisorption.

4. Enthalpy if adsorption is high around 80-240 kJ/mol

5. High temperature is required.

6. High activation energy is needed sometimes

7. result is unimolecular

 

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