The effect of titania precursors and ceria loadings on textural and chemical properties of TiO sub(2)-CeO sub(2) and Pt-Rh/TiO sub(2)-CeO sub(2)

Abstract The paper presents the results of the authors regarding the synthesis of TiO sub(2)-CeO sub(2) mixed oxides using different precursors: (1) titanium isopropoxide and (2) titanium butoxide with different ceria loadings. The samples were characterized from chemical, structural and morphological point of view. The obtained powders were used as support for Pt-Rh impregnation and the influence the Pt-Rh in reduction of the support was established. From XPS, TPR and EPR analysis it was concluded that Ce super(3+) species are present in higher proportion (>50 %) in series supported Pt-Rh catalysts and it was taken as indicative of oxygen mobility. Correlation between ceria loading and percentage of Ce super(3+) in catalytic samples was observed. It was also evident that Rh addition allows increasing the reducibility of materials due to interactions metal-support. Graphical Abstract