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Single atom catalyst (SAC) is a vivid new area of research in catalysis.However, the activity in CO oxidation of isolated Pt or Pd atoms, generallysupported on an oxide powder, is still controversial. Furthermore, the steadystate activity of few atoms clusters is still not yet quantitatively known. Inthis work we study, by molecular beam reactive scattering (MBRS), the activityof Pd$_{\rm n}$ ($n$ = 1-5) clusters, grown on a nanostructured alumina filmson a Ni$_3$Al(111) surface. It is shown that the single atoms are not active at473 K but they diffuse and coalesce at 533K forming larger clusters. Theactivity of a cluster is proportional to the number of atoms it contains(n=2-5). At 533 K, the activity per (surface-) atom, which is the turnoverfrequency (TOF), is constant. Its value is close to those obtained for largeclusters of 181$\pm$13 atoms and Pd (111) extended surfaces, in the sameexperimental conditions.

Activity of Pd$_{\rm n}$ (n = 1-5) Clusters on Alumina Film on Ni$_3$Al(111) for CO Oxidation: A Molecular Beam Study