Particle size, effect on rate

Figure 15.10a and b show the product distribution vs. reaction time for Pd particles of 2.1 and 6.1 nm mean size, respectively. Particle size effects on rate and selectivity are described in [57] here we focus on the particle size dependence of the initial activity (reaction time 60 min). Eigure 15.10c displays the initial turnover frequency as a function of mean Pd particle diameter. For this plot, the total number of Pd surface atoms was used for rate normahzation, yielding a pronounced particle size dependence, indicating that larger Pd particles are more active than smaller ones, in agreement with earlier reports ([58] and references therein). 

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