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Surface Chemistry
Question
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How does an increase in temperature affect both physical as well as chemical adsorption? 

Answer

Answer:

In the case of physical adsorption the extent of adsorption (x/m) decrease with increase of temperture, as most of the adsorption processes are exothermic with increase n temperature the kinetic energy of the molecule increase and they try to escape from the surface and hence physical adsorption decreasewith increase in temperature.


In case of chemical adsorption as the temperature increase the extent of adsorption (x/m) increase, attains a maximum value and then decrease.
Chemical adsorption takes place as a result of chemical reaction between adsorbate and adsorbent hence with the increase in temperature the adsorption increase untill the total surface is covered with one layer after there is adsorption by increasing temperature.

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