Physisorption Totally Explained

Everything about Physisorption totally explained

Physisorption or physical adsorption is a type of adsorption in which the adsorbate adheres to the surface only through Van der Waals (weak intermolecular) interactions, which are also responsible for the non-ideal behaviour of real gases. It is characterised by:* Low ambient temperature, always under the critical temperature of the adsorbate;

Type of interaction: Intermolecular forces (van der Waals forces);
Low enthalpy: ΔH < 20 kJ/mol;
Adsorption takes place in multilayers;
Low activation energy.
The energy state of adsorbate isn't altered.
Reversible.

Examples

N₂ on iron at 80 K

Further Information

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