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Effect of Zirconia Precursor on the Properties of ZrO2-SiO2 Sol-Gel Oxides

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Abstract

Sol-gel zirconia-silica oxides were synthesized with two zirconium precursors, zirconium n-butoxide and zirconium acetylacetonate, and two different hydrolysis catalysts, HCl and H2SO4. The samples prepared with HCl were additionally sulfated with a 1 M solution of H2SO4. Characterization was performed with FTIR and 29Si-MAS-NMR spectroscopy, as well as with nitrogen adsorption. Because zirconium and silicon alkoxides have different hydrolysis rates, it was necessary to perform a pre-hydrolysis of the silicon alkoxide before mixing. The atom distribution in the ZrO2-SiO2 system depended on the zirconium precursor, which also determined the zirconium incorporation in the silica lattice, which was greater for zirconium acetylacetonate. The zirconium precursor also was responsible for the silanol concentration, which increases when samples were sulfated. Sulfating stabilizes the specific surface area. On sulfate samples calcined at 800°C BET areas larger than 500 m2/g were obtained.

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López, T., Tzompantzi, F., Hernández-Ventura, J. et al. Effect of Zirconia Precursor on the Properties of ZrO2-SiO2 Sol-Gel Oxides. Journal of Sol-Gel Science and Technology 24, 207–219 (2002). https://doi.org/10.1023/A:1015380523481

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