Structure and Properties of WO₃-ZrO₂ Gel Composites as Potential Catalysts for Hydrocarbons Isomerization Process

摘要

Tungsten oxide dispersed on zirconia in WO3-ZrO2 system found application as strong acidic catalyst in hydrocarbons isomerization process.Specific method for synthesis of gel metal oxide composites based on Complex Sol-Gel Process (CSGP) were elaborated in Institute of Nuclear Chemistry and Technology, Warsaw. Structural investigations of WO3-ZrO2 gel composites thermally treated at 500?°C, 650?°C and 800?°C using X-ray diffraction (XRD) and scanning electron microscopic (SEM) methods were carried out. The gel composites annealed at 500?°C appears as amorphous material, in the composites thermally treated at 650?°C beginning of crystalline forms are observed. The gel composites annealed at 800?°C are polycrystalline.Both oxides exist as separate crystalline phases, ZrO2 in the high symmetry forms: cubic and tetragonal, WO3 in the monoclinic form.