Why is an optimum size present? Titanium dioxide-supported gold nanoparticles (Au/TiO2) show catalytic activity for H2O2 decomposition (kobs) with a maximum at the mean size of 4.6 nm (see graph) as a result of the balance of the active site numbers and the Fermi energy of Au NPs. The H2O2–Au/TiO2 system enables the chemoselective oxidation of cinnamyl alcohol to cinnamaldehyde, for which the selectivity parallels kobs.
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Kiyonaga et al. (2009) studied this question.
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