What is the difference between catalyst and catalysis? A catalyst is a reagent that assists in changing the rate of the reaction without actually taking part in it. Catalysis is the modification of the rate of a chemical reaction, usually an acceleration, by the addition of a substance that stays dormant and is not consumed during the reaction. Do catalysts last forever? Theoretically, catalysts truly remain unchanged and last forever. In actual practice, various events can occur that limit the useful lifetime of many catalysts
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