Pd nanoparticles with highly defined structure on MgO as model catalyst : An FTIR study of the interaction with CO, O-2, and H-2 under ambient conditions

H. Borchert , B. Jurgens , V. Zielasek , G. Rupprechter , S. Giorgio (1) , C.R. Henry (1) , M. Baumer

1 CRMCN - Centre de recherche de la matière condensée et des nanosciences

Model catalytic studies under ambient conditions require materials with well-defined structures for the establishment of clear relationships between structural and catalytic properties. In the present work, such a system was prepared by controlled decomposition of organometallic Pd precursors on a MgO support. The resulting Pd nanoparticles of highly defined morphology were characterized by high-resolution transmission electron microscopy and investigated with respect to their interaction with CO, O-2, and H-2 by IR spectroscopy (DRIFTS). Temperature-dependent CO adsorption experiments revealed the available adsorption sites on the Pd particles and indicated CO disproportionation on the Pd particles. We report in particular on the interplay between metal and support in these processes, which was analyzed by a thorough comparison of Pd/MgO with the pure MgO support. Investigations of the interaction with CO and H-2 suggest that Pd facilitates the formation of formates on MgO via dissociation of hydrogen on the Pd particles. Furthermore, CO oxidation was studied as a function of the C

H. Borchert, B. Jurgens, V. Zielasek, G. Rupprechter, S. Giorgio, et al.. Pd nanoparticles with highly defined structure on MgO as model catalyst : An FTIR study of the interaction with CO, O-2, and H-2 under ambient conditions. Journal of Catalysis, 2007, 247 (2), pp.145-154. ⟨hal-00165313⟩