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Catalyst Definition
Apr 17, 2018

According to the definition of the International Union of Pure and Applied Chemistry (IUPAC) in 1981, the catalyst is a substance that changes the reaction rate but does not change the overall standard Gibbs free energy. This effect is called catalysis and the reaction involving the catalyst is called catalytic reaction.


The composition, chemical properties and quality of the catalyst itself do not change before and after the reaction; the relationship between the catalyst and the reaction system is similar to the relationship between the lock and the key, and has a high degree of selectivity (or specificity). A catalyst does not catalyze all chemical reactions; some chemical reactions are not the only catalysts.