Chemisorption of CO and H on Pd, Pt and Au nanoclusters: a DFT approach
School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
2 Molecular Modeling Laboratory, Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, 56124 Pisa, Italy
Corresponding author: a email@example.com
Published online: 13 February 2009
We have performed a theoretical study of pure metal nanoparticles (Pd/Pt/Au) and their interaction with CO molecules and atomic hydrogen, in order to investigate chemisorption effects of relevance to catalysis by nanoparticles. First-principles density-functional local relaxations are used to investigate the effect of CO and H adsorption on six structural motifs. The results of the energetic crossover and structural deformations are analyzed in terms of the interplay between metal-metal interactions (including internal and surface stress) and CO-metal and H-metal interactions. It is found that H adsorption releases surface stress, thus favoring 5-fold symmetry motifs, whereas CO adsorption produces a flattening of the potential energy surface of the metal clusters.
PACS: 61.46.Bc – Structure of clusters / 71.20.Be – Transition metals and alloys / 31.15.es – Applications of density-functional theory
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009