Abstract
AbstractPt supported on alumina is an essential component of emission treatment catalysts used in transportation. Theoretical, experimental, and mechanistic aspects of Pt particles supported on a variety of supports have been studied extensively; however, available experimental information on the behavior of single versus sub‐nanometer Pt is extremely limited. To bridge the knowledge gap between single supported Pt and well‐formed supported Pt nanoparticles, we have performed the synthesis, characterization, and CO and NO oxidation studies of sub‐nanometer Pt supported on α‐, θ‐, and γ‐Al2O3 and monitored the changes in structure upon exposure to CO and NO oxidation conditions. We find that sub‐nanometer Pt is highly effective for CO oxidation because of the high Pt dispersion, but it is not very efficient as a NO oxidation catalyst. Furthermore, sub‐nanometer Pt agglomerates rapidly under CO or NO oxidation conditions to form nanoparticles.
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