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Of physisorption or chemisorption, which has a higher enthalpy of adsorption?

Of physisorption or chemisorption, which has a higher enthalpy of adsorption?

Grade:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
6 years ago
Chemisorption has higher enthalpy of adsortion because in chemisorption the chemical bonds are much stronger.
In adsorbed state the adsorbate is held on the surface of adsorbent by attractive forces (bond). Depending on the nature of attractive forces, adsorption can be of two types - physical adsorption (Physisorption) and chemical adsorption (Chemisorption). In chemisorption there is a strong chemical bond.
Enthalpy change during adsorption process are called enthalpy of adsorption. It is defined as the heat evolved at constant pressure, when one mole of an adsorbate is adsorbed on the surface of adsorbent. For physical adsorption and chemical adsorption, its values ranges in the order of -20KJ/mol and 200kjmol-1

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