Abstract
Composites TiO2-Hydrotalcite were prepared from synthesized TiO2 using titanium i) isopropoxide, ii) titanium butoxide and hydrotalcites Mg/AlCO32– obtained by the sol - gel method. Adsorption-desorption isotherms from N2 were obtained to determine BET surface area, volume and average diameter for pore. Surface fractal dimension determination has been a powerful tool to describe the roughness and irregular shape in several objects at different scales. The most common method to obtain surface fractal dimension data is calculated based on the surface area measurement by gas N2 adsorption. This work computes fractal dimension of composites using adsorption-desorption isotherms from N2, applying both Frenkel–Halsey–Hill and Mahnke-Mogel methodologies for this purpose. Surface fractal dimension values show minimal differences in both methodologies, and the analyzed materials were in the intermediate roughness range (2.11≤D≤2.47), which is due to the mesoporous original materials; hydrotalcite and TiO2. Pore size distribution and hysteresis loop affects the surface fractal dimension, but it did not have a significant influence on catalyst process.
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