Preparation and characterization of mesoporous ceria–zirconia–alumina nanocomposite with high hydrothermal stability

CeO_2–ZrO_2–γ-Al_2O_3 mixed oxides with different molar compositions have been synthesized by the sol-gel method using nitrate–alkoxide precursors. Some relationships between the molar composition of the ternary systems and their textural and structural properties are presented. CeO_2–ZrO_2–γ-Al_2O_3 mixed oxides have been studied and characterized using x-ray diffraction, transmission electron microscopy, and Raman spectroscopic analyses. By complete porosity analyses of all samples before and after hydrothermal (up to 75% steam) treatment at 500 °C, we have been able to optimize a highly hydrothermally stable CeO_2–ZrO_2–γ-Al_2O_3 system with a molar ratio of 10:10:80 mol%. γ-Al_2O_3 alone and CeO_2-doped as well as ZrO_2-doped γ-Al_2O_3 were also investigated by the hydrothermal treatment, and their steam-sensitive properties have been compared with those of the ternary CeO_2–ZrO_2–γ-Al_2O_3 system.

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