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Bulk and surface characterization of alumina-rich Al2O3–TiO2 mixed oxides with TiO2/(Al2O3+TiO2) molar ratios equal to 0, 0.05 and 0.1, prepared by sol–gel and impregnation procedures have been performed by XRD, DTA, surface area, FTIR, UV–Vis, FT-Raman and TPD of ammonia. The results indicate that in the case of the samples prepared by the sol–gel procedure, an increase in surface area with titania...