IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Wednesday Sessions
       Session SS2-WeM

Paper SS2-WeM7
Catalytic Reactions on Alkali-modified Vicinal Cu(100) Surfaces

Wednesday, October 31, 2001, 10:20 am, Room 121

Session: Surface Reactions on Metals
Presenter: J Onsgaard, Aalborg University, Denmark
Authors: J Onsgaard, Aalborg University, Denmark
J.P. Godowski, University of Wroclaw, Poland
S.V. Hoffmann, Aarhus University, Denmark
L. Bech, Odense University, Denmark
Correspondent: Click to Email
Coadsorption of atoms and molecules with alkali-metal(AM) atoms on single crystal metal surfaces is of importance in heterogenous catalysis. The roles of AM (K or Cs) coverage and steps on vicinal Cu(100) surfaces - Cu(115) and Cu(117) - have been studied with respect to reactivity with low-molecular gases. It is demonstrated that the presence of steps and AM in the submonolayer coverage regime enhances the reactive properties of these surfaces. The Cu(115) surface, particularly, but also the Cu(117) surface modified with AM exhibit a high surface reactivity. The processes studied include dissociation of CO and synthesis of formate from coadsorption of H and CO@sub 2@. The C and O 1s core level shifts and the changes in the intensities of the satellite peaks are discussed in terms of the CO-substrate and/or the interatomic C-O interactions. A series of techniques, including photoelectron spectroscopy based on synchrotron radiation, thermally programmed desorption, work function measurements and LEED has been used.