Question

types of adsorption?????

Answer 1

Answer:

Depending upon the nature of the forces involved, two main types of adsorption process may be distinguished, Page 2 1) Physical adsorption or the Physisorption 2) Chemical adsorption or Chemisorption The third type of adsorption, which is referred to, as activated adsorption is also known. boiling point of adsorbate.

Answer 2

Answer:

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there are two types of adsorption

Physical absorption occurs when the adsorbate gas molecules are held by physical forces like Van der Waals forces.

Chemical adsorption occurs when the absorbate molecule is held on the adsorbent surface by chemical forces as short covalent chemical bonding occurs by the sharing of electrons.

Properties of Physical Adsorption

The heat of absorption is very low (about 5kcal/mole) and reversible.

Adsorption is more pronounced at a temperature below the boiling point of absorbate.

This adsorption is always multilayer and is almost non-specific.

physical adsorption is more a function of absorbate.

This absorption has no appreciable specific heat of activation.

Properties of Chemical Adsorption

The heat of chemical absorption is relatively high than the physical adsorption (about 20 to 100kcal/mole). The attachment is strong and the equilibrium attains slowly.

Chemical Adsorption is more pronounced usually at a high temperature.

This adsorption is always monolayer mainly and is highly specific in nature.

Chemical adsorption has a characteristic function of both adsorbate and adsorbent.

This absorption has appreciable heat of activation.