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Adsorption and reactions of O2 and D2 on small free palladium clusters in a cluster-molecule scattering experiment

Journal article
Authors Mats Andersson
Arne Rosén
Published in Journal of Physics: Condensed Matter
Volume 22
Issue 33
Pages 334223
ISSN 0953-8984
Publication year 2010
Published at
Pages 334223
Language en
Keywords cluster, palladium, molecular beam, surface reaction
Subject categories Molecular physics, Chemical physics, Chemical physics

Abstract

The adsorption of oxygen and hydrogen (deuterium) on small neutral palladium clusters was investigated in a cluster beam experiment. The beam passes through two low-pressure reaction cells, and the clusters, with and without adsorbed molecules, are detected using laser ionization and mass spectrometry. Both H2 and O2 adsorb efficiently on the palladium clusters with only moderate variations with cluster size in the investigated range, i.e. between 8 and 28 atoms. The co-adsorption of H2 and O2 results in the formation of H2O, detected as a decrease in the number of adsorbed oxygen atoms with an increasing number of collisions with H2 molecules. A comparison is done with an earlier similar study of clusters of Pt. Furthermore a comparison is done with what is known for sticking and reactivity of surfaces.

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