What are main functions of catalysts?

Answer 1

Catalyst is the agent which alter the rate of chemical reactions. Catalyst are not consumed by the reaction as the other reactants.

Those catalyst which increase or speed up the reaction are known as positive catalyst.

Those who slow the reaction are known as negative catalyst.

Answer 2

Catalysts increase the rate of a chemical reaction without being consumed themselves. They provide an alternative pathway for the reaction to proceed by lowering the activation energy required for the reaction to occur. This results in a faster reaction rate and more efficient use of resources.