in catalysis
A relatively small quantity of one or more substances, which when added to a @[email protected] improves the activity, the @[email protected], or the useful @[email protected] of the @[email protected] In general, a promoter may either augment a desired reaction or suppress an undesired one.
PAC, 1976, 46, 71. (Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis) on page 79 [Terms] [Paper]