The reduction in rate due to reduction or loss of activity of a
catalyst caused by
adsorption of poison which is not greatly preferred to adsorption of reactant.
Source:
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 83