In chemistry, a catalyst (Greek: καταλύτης, catalytēs) is a substance that decreases the activation energy of a chemical reaction (see also catalysis) without itself being changed at the end of the chemical reaction. Catalysts participate in reactions but are neither reactants nor products of the reaction they catalyse (a strange 'exception' is the process of autocatalysis). More generally, one may at times call anything that accelerates a reaction, without itself being consumed or changed, a "catalyst" (for example, a "catalyst for political change").

A promoter is an accelerator of catalysis, but not a catalyst by itself.

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Catalysts generally react with one or more reactants to form a chemical intermediate that subsequently reacts to form the final reaction product, in the process regenerating the catalyst. The following is a typical reaction scheme, where C represents the catalyst, A and B are reactants, D is the product of the reaction of A and B:

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Your Weekly Catalyst Quote http://aweber.com/b/Ty6A
kimfreedman (Kim Freedman) Wed, 23 Dec 2009 11:01:04 -0000
Your Weekly Catalyst Quote http://aweber.com/b/Ty6A
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tmj_grn_sales (TMJ-GRN Sales Jobs) Wed, 23 Dec 2009 10:24:48 -0000
ScanSource, Inc. is Hiring: Inside Sales Rep (Catalyst) 2009-097 (Greenville, SC) http://bit.ly/8fYgg8 #Jobs #TweetMyJOBS
Cold weather, actually really cold weather combined with race catalyst convertor, means pure white smoke, best leave it indoors
Porsche911UK (Porsche 911uk) Wed, 23 Dec 2009 09:19:48 -0000
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