Promotion Index Plj

The measurement of Plj and pij is quite straightforward when the promoting species (e.g. Na+) does not react appreciably with any of the reactants or products. In this case, as already noted, the coverage 0Na of sodium on the metal surface can be easily measured coulometrically via  

Consequently the maximum PI0s values measured so far are on the order of 60 and 100, respectively, for the oxidation of C2H4 on Pt4,59 and on Rh.50 

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