Weak and reversible adsorption
of a poison
, such that removal of the poison from the fluid phase results in restoration of the original catalytic activity.
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