Question
Why does physisorption decrease with the increase of temperature?
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Answer
Physisorption is an exothermic process:
$\text{Solid}+\text{Gas}\rightleftharpoons\text{Gas}/\text{Solid}+\text{Heat}\$\text{Adsorbent})\ \ (\text{Adsorbate})\ \ (\text{gas adsorbed on solid})$
According to Le-Chatelier’s principle, if T is increased, equilibrium shifts in the backward direction i.e., gas is released from the surface of solid.
$\text{Solid}+\text{Gas}\rightleftharpoons\text{Gas}/\text{Solid}+\text{Heat}\$\text{Adsorbent})\ \ (\text{Adsorbate})\ \ (\text{gas adsorbed on solid})$
According to Le-Chatelier’s principle, if T is increased, equilibrium shifts in the backward direction i.e., gas is released from the surface of solid.
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