Cluster Size Dependent Kinetics: Analysis of Different Reaction Mechanisms

Quantitative description for turnover frequency dependence on the metal cluster size is discussed for competitive Langmuir-Hinshelwood mechanism showing that the apparent reaction orders depend on the cluster size. Position of the maximum rate of the turnover frequency for a two-step sequence is a function on temperature and only in a special case, maximum of the turnover frequency is temperature independent on reaction temperature. For the same reaction mechanism the impact of internal diffusion limitations on structure sensitivity is discussed. [GRAPHICS] .