Abstract
A series of ZrO2-TiO2 mixed oxides with different weight ratios (5, 20, and 30% ZrO2) were prepared by wet impregnation of TiO2-P25 Degussa with certain amounts of ZrO(NO3)2·6H2O (Fluka) dissolved in deionised water. The samples were characterized by the XRD, \(TPD_{NH_3 } \), \(TPD_{CO_2 } \), \(TPR_{H_2 } \), and BET methods. An increase in ZrO2 content shifted the phase transition temperature (anatase into rutile) toward higher temperatures. X-ray diffraction using an Anton Paar XRK900 reactor chamber indicated that, in the case of samples containing ZrO2, an additional diffraction peak appeared after cooling down to 25°C. This peak could be attributed to a polymorph of TiO2 such as in the single crystal of anatase or hexagonal form of TiO2 which appears in the presence of ZrO2. Generally, the preparation of dioxide systems can modify the properties of pure compounds or generate new catalytic sites as a result of strong interaction between ZrO2 and TiO2 oxides. The binary systems exhibit advantages like strong acidity, extended specific surface area, and high thermal stability in comparison with TiO2.
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