Abstract
Mesoporous CeO 2 nanoparticles were synthesized through a hard-template approach using MCM-48. After removal of silica by hot NaOH solution, the obtained mesoporous CeO 2 was a reverse-replica of the porosity structures of MCM-48. Compared to nanocrystalline CeO 2 powder prepared by alkaline precipitation, the mesoporous CeO 2 samples were smaller in particle size and much larger in surface area and in proportion of surface oxygen reducible at low temperature. The gold catalysts supported on the mesoporous CeO 2 exhibited high catalytic activity and stability in benzene oxidation. Complete conversion of 0.5% benzene in air to carbon dioxide could be achieved at 200 °C and high benzene conversion was maintained at 220 °C in a test of 50-h duration whereas, a gold catalyst supported on normal ceria powder suffered severe deactivation due to gold sintering when tested under the same condition.
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