Preparation and catalytic performance of mesoporous ceria-base composites CuO/CeO2, Fe2O3/CeO2 and La2O3/CeO2

摘要

Mesoporous CeO2-based oxides (CuO/CeO2, Fe2O3/CeO2 and La2O3/CeO2) were synthesized by a one-step hydrothermal method. CeO2-based oxides showed the undoped flower-like mesoporous microspheres of 2-6 mu m in diameter with high BET surface areas. Copper, iron or lanthanum ions were each successfully doped into ceria and the dopants enhanced the amount of Ce3+ in cerium in all samples, which improved the oxygen mobility and the amount of surface active oxygen. The synthesized CeO2-based oxides showed significantly improved catalytic activity toward the oxidation of styrene, among which CuO/CeO2 exhibited the highest activity of 92.5% conversion. The catalytic activity of the composites was demonstrated to closely parallel their surface area and surface active oxygen atom sites.