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Why does physisorption decrease with the increase of temperature?

Why does physisorption decrease with the increase of temperature?

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6 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
Adsorption is an exothermic process. Heat is releases whenever molecules are adsorbed on the surface.
So, rate of adsorption decreases whenever temperature is increases. This due to the fact that, when temperature is increases, the kinetic energy of adsorbed molecules gets increased and they overcome the electrostatic force of attraction by the adsorbent surface.
Pooja gupta
19 Points
7 years ago
Physisorption is exothermic in nature. Therefore according to le chateliars principle, it occurs readily at low temperature and decreases with increase in temperature.
DILIP
116 Points
7 years ago
Adsorption is an exothermic phenomenon. This means that a gas adsorbs on the solid surface with the evolution of heat. The increase in temperature will favour the reverse process i.e. desorption according to Lechatelier's principle. Therefore, physisorption decreases with increase in temperature.  
Sarita
23 Points
6 years ago
In physical adsorption bond between adsorbent ie surface and adsorbate llike gases are weak so when temperature is increasing the the bond get break easily and adsorption of adsorbate get stop so rate will decrease on increasing temperature.,🎤😊
Kushagra Madhukar
askIITians Faculty 628 Points
3 years ago
Dear student,
Please find the attached solution to your problem
 
It is known that Adsorption is an exothermic process. So, rate of adsorption decreases whenever temperature is increases. This can also be understood by the fact that when temperature is increased, the kinetic energy of adsorbed molecules gets increased and they overcome the electrostatic force of attraction by the adsorbent surface.
 
Hope it helps.
Thanks and regards,
Kushagra
 
Dipthi
13 Points
2 years ago
Physisorption also known by van der Waals adsorption due to bonds present bet adsorbent & adsorbate. As the temp goes up, this Van der Waal forces becomes weak due to that rate of Physisorption decreases bcoz of rate of monolayer formation bet adsorbate and adsobent get decrease.

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