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Definition:
Substance whose presence increases the rate of a chemical reaction. It is added in a small quantity as compared to the amounts of primary reactants, and does not become a component part of the chain; it is referred to as an initiator. In some cases the catalyst functions by being consumed and regenerated; in other cases the catalyst seems not to enter the reaction and functions by virtue of surface characteristics of some kind. A negative catalyst (inhibitor, retarder) slows down a chemical reaction. See also HARDENER, INHIBITOR, PROMOTER and CURING AGENTS.
Definition Copyright ©1989 CRC Press LLC. All rights
reserved.
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