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ElectroWang

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Chemisorption is a type of adsorption whereby a molecule adheres to a surface through the formation of a chemical bond, as opposed to the Van der Waals forces which cause physisorption. It is characterised by:

High temperatures.
Type of interaction: strong; covalent bond between adsorbate and surface.
High enthalpy: 50 kJ/mol <¦¤H< 800 kJ/mol
Adsorption takes place only in a monolayer.
High activation energy
Increase in electron density in the adsorbent-adsorbate interface.
Reversible only at high temperature.
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ElectroWang

Í­³æ (СÓÐÃûÆø)

Physisorption[1] 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:[2]

Low ambient temperature, always under the critical temperature of the adsorbate;
Type of interaction: Intermolecular forces (van der Waals forces);
Low enthalpy: ¦¤H < 20 kJ/mol;
Adsorption takes place in multilayers;
Low activation energy.
The energy state of adsorbate is not altered.
Reversible.
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