Issue 21, 2024

A molecular beam study of CO oxidation on Pd clusters supported on alumina: the effect of cluster size

Abstract

The activity in CO oxidation of regular arrays of Pd clusters, in the size range of 5–180 atoms, supported on alumina has been studied by using a molecular beam method. The Pd clusters are grown on a nanostructured ultrathin alumina film on Ni3Al(111) providing a hexagonal array of clusters with a narrow size distribution. The steady state turnover frequency (TOF) is measured as a function of the mean cluster size. On average the TOF increases with size. Below about 20 atoms, the TOF increases rapidly and for larger clusters it grows slowly and reaches a value close to those obtained on bulk single crystals at 180 atoms. The size effect is explained by the smaller activity of Pd atoms in contact with the alumina support.

Graphical abstract: A molecular beam study of CO oxidation on Pd clusters supported on alumina: the effect of cluster size

Supplementary files

Article information

Article type
Paper
Submitted
08 Mar 2024
Accepted
02 May 2024
First published
03 May 2024
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2024,26, 15338-15343

A molecular beam study of CO oxidation on Pd clusters supported on alumina: the effect of cluster size

G. Sitja and C. R. Henry, Phys. Chem. Chem. Phys., 2024, 26, 15338 DOI: 10.1039/D4CP01030B

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