Surface basicity of ceria-supported lanthana. Influence of the calcination temperature

The surface basicity of pure ceria is strongly enhanced by the presence of the supported La2O3, the effect being very much influenced by the calcination temperature. X-ray diffraction (XRD), Raman spectroscopy, and La 3d(5/2) XPS data for the different samples show a progressive incorporation of La3+ into the ceria lattice as the calcination temperature is increased. This structural change is considered to be responsible for the modifications that occurred in the basicity of the lanthana-modified ceria samples as revealed by temperature-programmed desorption-mass spectrometry (TPD-MS) of pre-adsorbed CO2. Copyright (C) 2006 John Wiley & Sons, Ltd.