Catalyst Definition

Chemistry Glossary Definition of Catalyst

A catalyst permits a different energy pathway for a chemical reaction.
A catalyst permits a different energy pathway for a chemical reaction which has a lower activation energy. The catalyst is not consumed in the chemical reaction. Smokefoot, Wikipedia Commons
Catalyst Definition: A catalyst is a subtance that increases the rate of a chemical reaction by reducing the activation energy, but which is left unchanged by the reaction.

Examples: A piece of platinum foil is a catalyst for the combustion of methane in air.