Discuss the effect of pressure and temperature on the adsorption of gases on solids.

Explanation

Effect of pressure on adsorption `:` At constant temperature, the extent of adsorption of a gas `(x//m)` in a solid increases with pressure. A graph between `x//m` and the pressure `P` of a gas at constant temperature is called adsorption isotherm.
Freundlich adsorption isotherm
`a.` At lower range of pressure `(x//m)` is directly proportional to the applied presure.
`(x)/(m)propP^(1)` ltbr. `b`. At high pressure range, the extent of adsorption of a gas `(x//m)` is independent of the applied pressure.
`(x)/(m)propP^(@)`
`c.` At intermediate pressure range the value of `x//m` is proportional to a fractional power of pressure, i.e.,
`(x)/(m)propP^(1//n)`
`log((x)/(m))=log K +(1)/(n)logP`
Effect of temperature on adsorption `:` Adsoption is generally temerature dependent.Mostly adsorption processes are exothermic and hence adsorption decreases with increasing temperature. However, for an endothermic adsorption process, adsorption increases with increase in temperature.