Volmer cation-exchanged

Metal dissolution usually follows the Butler-Volmer equation (Eqs. (1-26) and (1-28)) independent from which surface position the transfer of the metal cation may occur. The relation for the exchange current density may contain the concentration of a catalyzing or complexing anion. The catalysis of iron dissolution by OH" ions is a typical example which has been studied in detail (Bonhoeffer and Heusler, 1956). Its mechanism includes a sequence of partial reactions of an electrode process and its in-... 

While the presence of MV2+ on the zeolite external surface, or ion exchange of MV2+ with solution-phase cations such as H+ might be invoked to explain these anomalously high quenching rates, we consider these explanations unlikely. The Stem-Volmer plots for zeolites L and Y are linear down to very low MV2+ loading, where we would expect little or no MV2+ to be present at external sites. Ion-exchange with solution-phase H+ should give detectable concentrations of MV2+ and/or Ru(bpy)32+ in solution, and none... 

---