Bigger is not always better: Rhodium metal particles smaller than 2.5 nm are oxidized and stabilized by reducible supports such as ceria under CO oxidation conditions, whereas metal particles larger than 4 nm remain metallic. The very small Rh oxide particles are more active by two orders of magnitude in CO oxidation than Rh metal particles (see picture; TOF=turnover frequency).
No takes yet. Share an insight, caveat, or question.
Ligthart et al. (2011) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: