What is the difference
between physisorption and chemisorption?
What is the difference between physisorption and chemisorption?
-
Physisorption
Chemisorption
1.
In this type of adsorption, the
adsorbate is attached to the surface of the adsorbent with weak
van der Waal’s forces of attraction.
In this type of adsorption,
strong chemical bonds are formed between the adsorbate and the
surface of the adsorbent.
2.
No new compound is formed in the
process.
New compounds are formed at the
surface of the adsorbent.
3.
It is generally found to be
reversible in nature.
It is usually irreversible in
nature.
4.
Enthalpy of adsorption is low as
weak van der Waal’s forces of attraction are involved. The
values lie in the range of 20-40 kJ mol−1.
Enthalpy of adsorption is high as
chemical bonds are formed. The values lie in the range of 40-400
kJ mol−1.
5.
It is favoured by low temperature
conditions.
It is favoured by high
temperature conditions.
6.
It is an example of multi-layer
adsorption
It is an example of mono-layer
adsorption.
-
Physisorption
Chemisorption
1.
In this type of adsorption, the adsorbate is attached to the surface of the adsorbent with weak van der Waal’s forces of attraction.
In this type of adsorption, strong chemical bonds are formed between the adsorbate and the surface of the adsorbent.
2.
No new compound is formed in the process.
New compounds are formed at the surface of the adsorbent.
3.
It is generally found to be reversible in nature.
It is usually irreversible in nature.
4.
Enthalpy of adsorption is low as weak van der Waal’s forces of attraction are involved. The values lie in the range of 20-40 kJ mol−1.
Enthalpy of adsorption is high as chemical bonds are formed. The values lie in the range of 40-400 kJ mol−1.
5.
It is favoured by low temperature conditions.
It is favoured by high temperature conditions.
6.
It is an example of multi-layer adsorption
It is an example of mono-layer adsorption.
