"catalyst" . . "2017-09-04 Add term [OSTHUS]" . . "A chemical entity that increases the rate of a reaction without modifying the overall standard Gibbs energy change in the reaction. The catalyst is both a reactant and product of the reaction. [IUPAC]" . "false"^^ . . . . "A catalyst role is a reagent role of a substance that increases the rate of a reaction without modifying the overall standard Gibbs energy change in the reaction; the process is called catalysis. The catalyst is both a reactant and product of the reaction. [IUPAC]" . . . . "catalyst" . "catalyst role" . "Definition pending. [0]" . "PAC, 1996, 68, 155 (Glossary of terms used in chemical kinetics, including reaction dynamics.)" . "A catalyst role is a role of a portion of material that increases the rate of a reaction without modifying the overall standard Gibbs energy change in the reaction. The catalyst is both a reactant and product of the reaction. [IUPAC]" .