CO oxidation on a single Pd atom supported on magnesia

Abstract

The oxidation of CO on single Pd atoms anchored to MgO(100) surface oxygen vacancies is studied with temperature-programmed-reaction mass-spectrometry and infrared spectroscopy. In one-heating-cycle experiments CO${}_2$, formed from O${}_2$ and CO preadsorbed at 90 K, is detected at 260 K and 500 K. Ab-initio simulations suggest two reaction routes, with Pd(CO)${}_2$O${}_2$ and Pd(CO${}_3$)CO found as precursors for the low and high temperature channels, respectively. Both reactions result in annealing of the vacancy and induce migration and coalescence of the remaining Pd-CO to form larger clusters.

4 pages, 3 figures, scheduled for publication in PRL 18 June 2001

References in corpus (1)

• Structure and Magnetism of Neutral and Anionic Palladium Clusters

Cited by in corpus (5)

• Supported magnetic nanoclusters: Softlanding of Pd clusters on a MgO surface
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• Single-Atom Catalysis: An Opportunity For Surface Science
• Activity of Pd${}_{\mathrm{n}}$ (n = 1-5) Clusters on Alumina Film on Ni${}_3$Al(111) for CO Oxidation: A Molecular Beam Study
• The common attribute shared by defects, surfaces, and nanostructures: the BOLS-NEP notion