 |
| Image Source = https://pixabay.com/ |
-It has been seen that gases are categorised into two-
1.Easily Liquifable Gases-Exp-CO,CO2,HCl,NH3,CH4 etc.
2.Not-easily Liquifable Gases-Exp-H2,N2,O2 etc.
It has been seen that gases which are easily liquifiable adsorbed easily where as non- easily liquiflable gases do not.
Nature of Adsorbent: Greater the surface area more will be the extent of Adsorptaion.
PRESSURE: A relation or a graph between the magnitude of adsorption x/m and the pressure 'p' of the gas at const.temp. is called Adsorption iso-therm.
The adsorption of a gas on a solid surface increase with increase in pressure.
FREUNDLICH ADSORPTION ISOTHERM:
The adsorption of a gas on a solid surface increase with increase in pressure.The varation of adsorption with pressure at const.temp.can be represented by the following equation x/m=Kp power 1/n where,x is the mass of the gas adsorbed and m is the solid adsorbent at pressure 'P'
The quantiy 1/n is generally less than unity so,that amount of the gas adsorbed increase less rapidilly than the pressure.The above equation can also be written as-
Log(x/m)=Log k+1/n
TEMP: The amount of a gas adsorbed per unit mass of the adsorbent decrease with increase of temp.in caseof physical m adsorption,as we know that in physisoption adsorbat and adsorbent are held together by weak-vanderwaal forces.
.In caseof chemisoption x/m increase as temp.increase attain the max.value than decrease as chemical bonds are much stronger and requires min.energy temp.for their cleavage.
0 comments