The Influence of Modifying Additions of La and Ce Oxides on Electronic State of Surface Atoms and Ions of Supported Copper
Applied Surface Science
State Academy of Civil Engineering, Solanaya sq. 2
Boreskov Institute of Catalysis, Novosibirsk 630090
The electronic state of surface of supported copper in modified copper catalysts has been tested by the methods of IR-spectroscopy of adsorbed CO, X-ray diffraction analysis and electron microscopy. The modifying additions of cerium oxide stabilize the ionic state of copper, while lanthanum oxide decreases the effective charge of Cu+ ions. The observed effects are caused by variation in metal dispersivity in the modified samples and by electron donor-acceptor interaction of the surface atoms and ions of copper with the modifier.