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What are the factors affecting adsorption of gases on solids?
Factors affecting adsorption of gases on solids
(1) Nature of adsorbate: Physical adsorption is non – specific in nature and therefore every gas gets adsorbed on the surface of any solid to a lesser or greater exetent. However, easily liquefiable gases like NH3, HCL, Co2 etc are adsorbed to greater extent whereas H2, O2, N2 etc are adsorbed to lesser extent.
(2) Nature of Adsorbent: Activated carbon, metal oxides like aluminum oxide, silica gel and clay are commonly used adsorbents. They have their specific adsorption properties depending upon pores.
(3) Specific area of the adsorbent: The greater the specific area, more will be the extent of adsorption. That is why porous or finely divided forms of adsorbents adsorb larger quantities of adsorbate.
(4) Pressure of the gas: Physical adsorption increases with increase in pressure. The extent of adsorption is expressed as x/m where ‘x’ is amount of adsorbate. ‘m’ is mass of adsorbent when the dynamic equilibrium is established between free gas and the adsorbed gas.
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