What are the type of catalysts? Write.

The type of catalysts are as follows –

iii. Based on their physical state:

a. Heterogeneous catalyst :

When in a reaction the catalysts, reactants, and products are in different physical states then the catalyst is known as heterogeneous catalyst.

Example-

Vegetable oil (l) + H₂ (g) Vegetable ghee (l)

b. Homogeneous catalyst:

When in a reaction the catalysts, reactants and products are in the same phase then the catalyst is known as homogeneous catalyst.

Example:-

2SO₂ (g) + O₂ (g) 2SO₃ (g)

iv. Based on their action:

a. Positive catalyst:

The catalysts which increases the rate of a reaction are termed as positive catalyst.

Example:

2KClO₃ 2KCl + 3O₂

b. Negative catalyst:

The catalysts which decreases the rate of a reaction are termed as negative catalyst.

Example:

2H₂O₂ 2H₂O + O₂

c. Auto-catalyst;

When the product formed in a reaction itself behaves as a catalyst, then it is known as auto-catalyst.

Example:

CH₃COOC₂H₅ + H₂O → CH₃COOH + C₂H₅0H

d. Bio-catalyst:

The catalyst which increases the rate of the biochemical reactions occurring in a living organism are termed as bio-catalyst. These are also known as enzymes.

Example:

Maltose Glucose