| S.No. |
PHYSICAL ADSORPTION
|
CHEMICAL ADSORPTION
|
| 1. | Molecules are held due to vanderwaal’s forces. | Molecules are held due to chemical bond forces. |
| 2. | Heat of adsorption are in the range of 20 – 40KJ/Mol. | Heat of adsorption are in the range of 40 – 400 KJ/Mol. |
| 3. | Activation energy are small. | Activation energy are appreciable. |
| 4. | Usually occurs rapidly at low temperatures and decreases with increase in temperature. | Can occur at high temperature. |
| 5. | Usually completely reversible. | Often irreversible. |
| 6. | The extent of adsorption is approximately related to the ease of liquification of gas. | No such correlation is there. |
| 7. | Not very specific. | Often highly specific. |
| 8. | Form multilayer on the surface of adsorbent. | Forms unimolecular layer. |
| 9. | No surface compound is formed | Surface compounds are formed. |
Monday, September 22, 2014
Difference Between Physical Adsorption and Chemical Adsorption
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Surface Chemistry
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