Turnover rate constant, adsorption reactions

As the adsorption reactions (14,16,...) are fast, the turnover rate constant, fct, of the overall process is almost the same as the rate constant of electron transfer reactions (15,17,...). Again, the concentration increases during the reduction (reaction 12), with the consequence of a positive shift for °(q --QH2). However, °(Ag + i-Agn +i) also increases with n, and the autocalytic transfer continues up to the Ag" exhaustion. 

The kinetics of the CO oxidation reaction over all three noble metals exhibit a Langmuir-Hinshelwood type behavior, due to competitive adsorption of CO and oxygen, characterized by the appearance of rate maximum with increasing CO partial pressure. This is a typical behavior which has been described by many investigators for this reaction system [19,20], The catalytic activity, presented as turnover number of CO2 production, was measured by varying either the partial pressures of CO or O2, or temperature, keeping the other parameters constant. 

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