Difference Between Physical and Chemical Absorption

  1. Physical absorption:
  2. chemical absorption:

Including the bulk properties of a liquid, solid or gas is a phenomenon of absorption. It includes the molecules or atoms that pass through the surface and enter the volume of the material.

Physical absorption:

physiosorption o Physical adsorption is a type of adsorption that occurs upon contact with a solid or liquid surface for most particles.

chemical absorption:

Chemical absorption is a process of chemical reaction between absorbing substances and absorbed substances, it occurs when molecules or atoms are absorbed.

Here are some points of difference between physical and chemical absorption.

physical absorption

chemical absorption

It is a reversible absorption process.

It is an irreversible absorption process.

Balance is easily achieved

The balance is done gradually

Due to intermolecular van der Waal forces, physical absorption occurs

Due to the formation of chemical bonds, chemical absorption occurs

Low heat of adsorption

The heat of adsorption is very large

Decreases with increasing temperature

Increases with increasing temperature

Increased pressure increases adsorption

Pressure drop does not lead to desorption

It is easily adsorbed if the gases are easily liquefiable, it depends on the nature of the gas.

Significantly specific and depends on the nature of the adsorbent and the adsorbate

Multimolecular layers form on the surface of the adsorbent.

Unimolecular layers form on the surface of the adsorbent.


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