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- W2037447923 abstract "Abstract This paper presents new results, in terms of reactions, dissociation and site blocking, on the interactions between H and CO2, H and CO on an alkali-modified copper surface. In addition, H adsorption on the K/Cu(110) interface was performed. The experimental methods used include photoelectron spectroscopy based on synchrotron radiation, high-resolution electron energy-loss spectroscopy (HREELS), work-function measurements and low-energy electron diffraction (LEED). In order to leave free Cu sites, the alkali coverage chosen was mainly half a monolayer. The adsorption of hydrogen on Cu(110) and the K/Cu(110) interface gives rise to two valence-band states. The binding energies and populations of these states show different behaviour with increasing temperature. It is found that when the H/K/Cu(110) interface is exposed to CO2 at 130 K, formate is synthesised and carbonate is formed. No CO is present on the surface. The reactions depend on the adsorption sequence. CO2 in an amount corresponding to saturation was admitted to the K/Cu(110) interface at the same temperature. Both carbonate and CO were present on the surface. It is concluded that when the CO2/K/Cu(110) interface is exposed to H, carbonate is decomposed to CO. Hydrogen adsorption on the CO/K/Cu(110) interface at 146 K results in a weakening of the internal CO bond, as shown by the increase in the 4σ satellite intensity in the UPS spectrum and the increase in the binding energies of the CO orbitals. The HREEL spectra show indications of hydroxides and carbon-hydrogen species. Adsorption in the reverse order (i.e. CO on H/K/Cu(110)) gives no CO adsorption due to site blocking." @default.
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- W2037447923 date "1998-02-01" @default.
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- W2037447923 title "Interactions between H, CO and CO2 on an K-modified Cu(110) surface" @default.
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- W2037447923 doi "https://doi.org/10.1016/s0039-6028(98)80038-1" @default.
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