Possibly observed in @C00876@ with very small pores. The @S05563@ is largely determined by the bulk or size of one or more reactants.
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 81 [Terms] [Paper]