Difference Between Physical and 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 absorptionchemical absorption
It is a reversible absorption process.It is an irreversible absorption process.
Balance is easily achievedThe balance is done gradually
Due to intermolecular van der Waal forces, physical absorption occursDue to the formation of chemical bonds, chemical absorption occurs
Low heat of adsorptionThe heat of adsorption is very large
Decreases with increasing temperatureIncreases with increasing temperature
Increased pressure increases adsorptionPressure 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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