,
,
and
where the
s
represent the rate of feed of the given reactant fed per unit mass, volume or surface
area of the catalyst.
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 82