Particle size effect on the Langmuir-Hinshelwood barrier for CO oxidation on regular arrays of Pd clusters supported on ultrathin alumina films

Georges Sitja (1) , Héloïse Tissot (1) , Claude R Henry (1)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

The Langmuir-Hinshelwood barrier (ELH) and the pre-exponential factor (νLH) for CO oxidation have been measured at high temperature on hexagonal arrays of Pd clusters supported on an ultrathin alumina film on Ni3Al(111). The Pd clusters have a sharp size distribution and the mean sizes are: 174±13, 360±19 and 768±28 atoms. ELH and νLH are determined from the initial reaction rate of a CO molecular beam with a saturation layer of adsorbed oxygen on the Pd clusters, measured at different temperatures (493≤T (K) ≤613). The largest particles (3.5 nm) give values of E LH and νLHsimilar to those measured on Pd (111) [2]. However, smaller particles (2.7 and 2.1 nm) show very different behavior. The origin of this size effect is discussed in terms of variation of the electronic structure and of the atomic structure of the Pd clusters.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Georges Sitja, Héloïse Tissot, Claude R Henry. Particle size effect on the Langmuir-Hinshelwood barrier for CO oxidation on regular arrays of Pd clusters supported on ultrathin alumina films. Journal of Chemical Physics, 2019, 151 (17), pp.174703. ⟨10.1063/1.5125572⟩. ⟨hal-02408188⟩