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What is the difference between physisorption and chemisorption?

What is the difference between physisorption and chemisorption?

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1 Answers

Gaurav
askIITians Faculty 164 Points
7 years ago

Physisorption

  • Only van der Waals force are present between adsorbate and surface of adsorbent
  • Low enthalpy of adsorption ie, in the order of 20 kjmol-1.
  • Reversible
  • It is usually takes place atlow temperatureand does not require any activation energy.
  • Multi molecular layer of adsorbate are formed on the surface
  • Not specific.

Chemisorption

  • Chemical bonds are formed between adsorbate and surface of adsorbent
  • High enthalpy of adsorption i.e,order of 200 kjmol-1.
  • Irreversible
  • It takes place athigh temperatureand require activation energy..
  • Onlymonomolecular layersare formed.
  • Highly specific.

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