Difference Between Physical Adsorption and Chemical Adsorption

Chemical Adsorption:

Adsorption is the adhesion of a molecule to a surface. The adhesion can be permanent, but usually with chemicals or simply by heating the surface it can be reversed, it is complex to leave or break the surface of the particles, depending on whether the particle is physically or chemically adsorbed.

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

physical adsorption

chemical adsorption

The particles are held together by Vanderwaal forces.

Molecules are held together by the forces of chemical bonding.

It requires no activation energy.

You need any activation energy.

It is a reversible process.

It is an irreversible process.

In this process, no surface compound is formed.

In this process, surface compounds are formed.

It is generally faster at low temperature and decreases as the temperature increases.

can be high temperature

In physical adsorption, on the surface of the adsorbent, it forms a multilayer.

Upon chemical adsorption, they form a unimolecular layer.

It's not very concrete.

It's not very precise.

The adsorption rate is practically related to the ease of the gas.

There is no such correlation in this process.


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