Question

Write three differences between physical adsorption and chemical adsorption​

Answer 1

The common differences are as follows-

Physical Adsorption

1. This is usually takes place at low temperature and decreases with increase in temperature.

2. The forces of attraction holding the adsorbate are Vander Waal’s forces

3. Heat of adsorption is low

4. It is reversible

5. It is not very specific

6. It forms multimolecular layer

7. It does not require any activation energy

Chemical Adsorption

1. This takes place at high temperature

2. The forces of attraction holding the adsorbate are chemical bond forces

3.Heat of adsorption is high

4. It is irreversible

5. It is highly specific

6. It forms monomolecular layer

7. It requires activation energy

Answer 2

Answer:

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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.