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Basic Definition Of Catalyst
Jun 26, 2017

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

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