Key words: reactivity, titanium oxide, alumina, hydration, water fluid, titanates of rare-earth elements
The synthesis of strontium and barium titanates supported on the porous carrier (α-Al2O3) was performed via the treatment of the previously deposited precursors (titanium oxide, strontium nitrate, barium nitrite) in the water fluid medium at 400 °C. The obtained samples were characterized using the X-Ray Powder Diffraction (XRD) and Scanning Electron Microscopy combined with Energy Dispersion X-Ray analysis (SEM-EDX) techniques. It was found that in the presence of titanium oxide α-alumina undergoes a partial hydration with the formation of the basic aluminum hydroxide AlO(OH) (boemite) that was not found using the XRD method after the treatment of the pure α-Al2O3 in the same conditions. Using the SEM-EDX method we demonstrated that in spite of much higher content of alumina in the samples, strontium ions preferably interact with titania forming SrTiO3. It was shown that samples with different spatial distribution of the supported component inside the carrier particle can be obtained by varying the method of the preliminary deposition of the titania precursor (titanium tetra-iso-propoxide).
doi:10.34984/SCFTP.2020.15.2.002