Abstract
Samples of titania—alumina of various compositions were prepared by the following methods: precipitation from TiCl 4 solution with aqueous ammonia, impregnation, evaporation from titanium isoproxide solution in isopropanol, and grafting by reaction of TiCl 4 with a hydroxy group on Al 2O 3. BET, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and analytical electron microscopy (AEM) techniques were used to characterize the state of dispersion TiO 2 and Al 2O 3. The results showed that a homogeneous dispersion of TiO 2 and Al 2O 3 could be obtained by the grafting technique. The impregnation method could also result in an almost perfectly homogeneous distribution. For TiO 2—Al 2O 3 samples deposited by precipitation, the coverage of TiO 2 was less than 50% monolayer. Temperature programmed desorption (TPD) measurements of ammonia indicated that the acid sites of Al 20 3 modified by TiO 2 experienced a strong influence only for the sample prepared by the grafting technique.
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