Exchange is controlled by the metal — support transfer

The concentrations and C in Eq. (21) are linked to the total site concentrations on the metal and on the support 

Cmo and Cgo being the concentration of metal sites chemisorbing X or X atoms and Cgo, the concentration of exchangeable sites of support. Cmo and Cso can easily be calculated by  

9 being the coverage of metal particles with X - - X atoms during exchange, and So - Sm, the surface area of support. If one assumes that the number of X -h X atoms on the metal is negligible with respect to the number of 

X + X atoms in the gas phase, the number of exchanged atoms is given by Eq. (18) 

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