Science glossary film: Catalyst

Catalyst

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A substance that increases the rate of a chemical reaction without itself being permanently changed or used up.

A substance that increases the rate of a chemical reaction without itself being permanently changed or used up. Platinum is used as a catalyst in car exhausts, speeding up the oxidation of carbon monoxide and unburned hydrocarbons, and the removal of nitrogen oxides. In the human body, enzymes are naturally occurring catalysts that speed up cellular reactions.

Platinum is used as a catalyst in car exhausts, speeding up the oxidation of carbon monoxide and unburned hydrocarbons, and the removal of nitrogen oxides. In the human body, enzymes are naturally occurring catalysts that speed up cellular reactions.

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