Carbon Monoxide Adsorption on Silver Doped Gold Clusters
Artikel i vetenskaplig tidskrift, 2011

Well controlled gas phase experiments of the size and dopant dependent reactivity of gold clusters can shed light on the surprising discovery that nanometer sized gold particles are catalytically active. Most studies that investigate the reactivity of gold clusters in the gas phase focused on charged, small sized clusters. Here, reactivity measurements in a low-pressure reaction cell were performed to investigate carbon monoxide adsorption on neutral bare and silver doped gold clusters (Au(n)A(m); n = 10-45; m = 0, 1, 2) at 140 K. The size dependence of the reaction probabilities reflects the role of the electronic shells for the carbon monoxide adsorption, with closed electronic shell systems being the most reactive. In addition, the cluster's reaction probability is reduced upon substitution of gold atoms for silver. Inclusion of a single silver atom causes significant changes in the reactivity only for a few cluster sizes, whereas there is a more general reduction in the reactivity with two silver atoms in the cluster. The experimental observations are qualitatively explained on the basis of a Blyholder model, Which includes dopant induced features such as electron transfer from silver to gold, reduced s-d hybrization, and changes in the duster geometry.

size

copper clusters

co adsorption

reactivity

metal-clusters

anions

binding

o-2

electronic-structures

n clusters

Författare

J. De Haeck

KU Leuven

N. Veldeman

KU Leuven

Vlaamse Instelling voor Technologisch Onderzoek (VITO)

P. Claes

KU Leuven

E. Janssens

KU Leuven

Mats Andersson

Chalmers, Tillämpad mekanik, Förbränning

P. Lievens

KU Leuven

Journal of Physical Chemistry A

1089-5639 (ISSN) 1520-5215 (eISSN)

Vol. 115 11 2103-2109

Ämneskategorier

Fysikalisk kemi

Atom- och molekylfysik och optik

DOI

10.1021/jp111257s

Mer information

Senast uppdaterat

2018-06-11