Abstract
The dispersion of vanadium oxide, V 2O 5, on tetragonal zirconia, t-ZrO 2, and the effect of the dispersed vanadium oxide on the texture of zirconia have been studied by X-ray diffraction (XRD), laser Raman spectroscopy (LRS), differential thermal analysis (DTA) and BET surface-area measurements. The results indicate that the dispersion of vanadium oxide possibly proceeds by the incorporation of V 5+ ions into the vacant surface sites on the support, provided that the loading amount of vanadium oxide is not higher than its dispersion capacity. Quantitative XRD results give a dispersion capacity of 0.42 mmol V 2O 5/100 m 2 t-ZrO 2, which is in good agreement with the value evaluated by the incorporation model. On the other hand, the dispersed vanadium oxide species effectively inhibit the sintering of zirconia and its conversion from tetragonal to monoclinic phase. When the loading of V 2O 5 is below its dispersion capacity, the crystallization temperature and the surface area of the samples strongly depend on the content of vanadium oxide. Crystalline V 2O 5 appears when its loading is higher than the dispersion capacity, but it has little influence on the physical properties of the samples.
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