We have studied the trends in CO adsorption on close-packed metal surfaces:Co, Ni, Cu from the 3d row, Ru, Rh, Pd, Ag from the 4d row and Ir,
Pt, Au from the 5d row using density functional theory. In particular, we
were concerned with the trends in adsorption energy, geometry, vibrational
properties and other parameters derived from the electronic structure of the
substrate. The influence of specific changes in our set-up, such as choice of
the exchange correlation functional, the choice of pseudopotential, size of the basis set and substrate relaxation, has been carefully evaluated. We found that, while the geometrical and vibrational properties of the adsorbate¨Csubstrate complex are calculated with high accuracy, the adsorption energies calculated with the gradient-corrected Perdew¨CWang exchange¨Ccorrelation energies are overestimated. In addition, the calculations tend to favour adsorption sites with higher coordination, resulting in the prediction of the wrong adsorption sites for
the Rh, Pt and Cu surfaces (hollowinstead of top). The revised Perdew¨CBurke¨C Erzernhof functional (RPBE) leads to lower (i.e. more realistic) adsorption energies for transition metals, but to the wrong results for noble metals¡ªfor Ag and Au, endothermic adsorption is predicted. The site preference remains the same. We discuss trends in relation to the electronic structure of the substrate across the periodic table, summarizing the state-of-the-art of CO adsorption on close-packed metal surfaces.