Question

Why does adsorption decreases with increase in temperature?

Answer 1

Adsorption is an exothermic process. ... So, rate of adsorption decreaseswhenever temperature is increases. This due to the fact that, whentemperature is increases, the kinetic energy of adsorbed molecules getsincreased and they overcome the electrostatic force of attraction by the adsorbent surface.

Answer 2

Decrease in pressure will cause removal of gas molecules from the solid surface and thus temperature will increase...
it is clear that pressure will be inversely proportional to temperature
It is a physisorption