New binary systems Mg–M–O (M=Y, La, Ce): Synthesis and physico-chemical characterization

New binary oxide Mg–M–O (M=Y, La, Ce) systems are obtained by co-precipitation and characterized by adsorption methods, X-ray diffraction method (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy of adsorbed probe molecules (CO and CDCl3). It is shown that Mg–Y–O systems after calcination at 450–750 °C represent the physical mixtures of MgO and Y2O3, while the components of Mg–La(Ce)–O systems interact to form La2MgOx and (Ce,Mg)O2 solid solutions, respectively. From XPS data, the surface of the binary systems is enriched with lanthanide ions. Addition of ≈5 mol% M2O3 to MgO results in an increase in concentrations of strong and weak Lewis acidic sites, the content of the latter being much higher and changing in the series: MgO

FTIR spectra of CDCl3 adsorbed on MgO and binary Mg–M–O (≈5 mol% M2O3) systems at 0 °C.Figure optionsDownload as PowerPoint slide