In this study the mixed oxides ZrO 2 -SiO 2 , were synthesized by the sol-gel method with a molar ratio of 95:5 (Si/metal) and characterized by X-ray diffraction, absorption-desorption of N 2 , Fourier transform infrared spectroscopy, thermal gravimetric analysis, temperature-programmed desorption of ammonia, and acidity test by titration. The synthesized materials, which are amorphous to X-rays, are composed of a mixture of micro-and mesopores. They show a higher acid strength than the separate oxides, indicating that the ZrO 2 is highly dispersed in the silica matrix.
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