Abstract
Monodispersed rod-like and spherical ceria particles were successfully synthesized by a mild solution process followed by calcination treatment. The morphological control of cerium precursor was realized by using different cerium salts and precipitate reagents such as urea, hexamethylenetetramine and alkylamine. The effects of pre-aging temperature and time on the morphologies of final products were investigated in details. Monodispersed spherical precursor was obtained after pre-aging at 25°C for 3 days, while rod-like cerium carbonate precursor was produced after pre-aging at 50°C. Monodispersed rod-like cerium hydroxide precursor was formed by using triethanolamine as precipitant. Ceria particles with the same morphologies and similar particle size could be obtained after calcination in air at 400°C.
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