III International Conference

PP-II-97The obtained oxides were characterized by XRD, TGA, adsorption-desorption of N 2 ,TEM and SEM miscroscopy, IR and UV-Vis spectroscopy. In order to understand the relationbetween the catalysts and the fuels the materials were thermodynamic analyzed. The materialswere tested in oxidation with air of hydrocarbons (C1-C6). In order to investigate catalyticactivity the catalyst was loaded in the quartz reactor and products were chromatographicanalyzed. The adsorption of hydrocarbons on oxides surface was analyzed in an IR cell.The XRD patterns of ZrO 2 -TiO 2 -Y 2 O 3 powders show only the cubic phase of zirconiaand, 1-2 peaks between 2θ ranging 1-4 o indicating a long-range order in the oxides. TypicalSEM morphology of hierarchically nanostructured meso-macroporous materials is presentedin Fig. 1. TEM images show formation of aggregates with inorganic polymers. An orderedstructure is evidenced by TEM microscopy (Fig. 2).Fig. 1 SEM image of ZrO 2 -TiO 2 -Y 2 O 3 oxideFig. 2 TEM image of ZrO 2 -TiO 2 -Y 2 O 3 oxideThe surface area of oxides was varied between 780-1100 m2/g and adsorption-desorptionisotherm are typically for the materials obtained with block copolymers as surfactant. Porousstructure was influenced by composition and surfactant. Catalytic activity of oxide wasinfluenced by composition and promoters. A higher activity was evidenced for oxides withceria and/or NiCo promoters.References1. R.J. Gorte and J.M. Vohs, J. Catal., 216 (2003) 477. R.J. Gorte, S. Park, J.M. Vohs and C. Wang,Adv. Mater, 12 (2000) 1465.2. Chengzhong Yu, Bozhi Tian, Dongyuan ZhaoCurrent Opinion in Solid State and MaterialsScience 7 (2003) 191–197340