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itself A catalyst is a substance that is present in a chemical reaction in physical contact with the reagents, and speed, induces or promotes the reaction without acting on it.
Thus it is said that the reaction is "catalyst." Examples: production reactors ammonia, where substances are used to accelerate and increase the level of NH3 production without involving them in the atomic bonds but if they are present in the mixture. In this case the catalyst is a liquid, but may be solid or gaseous.
The catalysts are used especially in organic reactions.