On which factors adsorption of gas on solid adsorption depends
Answers
Answer:
The extent of adsorption depends directly upon the surface area of the adsorbent, i.e. larger the surface area of the adsorbent, greater is the extent of adsorption. (ii) Surface area of a powdered solid adsorbent depends upon its particle size. Smaller the particle size, greater is its surface area.
Answer:
There are various factors that affect the rate of adsorption of a gas on a solid surface.
(1) Nature of the gas: Easily liquefiable gases such as NH3, HCl etc. are adsorbed to a great extent in comparison to gases such as H2, O2 etc.
This is because Van der Waal’s forces are stronger in easily liquefiable gases.
(2) Surface area of the solid The greater the surface area of the adsorbent, the greater is the adsorption of a gas on the solid surface.
(3) Effect of pressure
Adsorption is a reversible process and is accompanied by a decrease in pressure.
Therefore, adsorption increases with an increase in pressure.
(4) Effect of temperature Adsorption is an exothermic process.
Thus, in accordance with Le-Chatelier’s principle, the magnitude of adsorption decreases with an increase in temperature.