Synthesis and characterization of nanosized ceria powders and high-concentration ceria sols

H. Zou, Y. S. Lin, N. Rane, T. He

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45 Scopus citations


Nanoscale, high surface area cerium oxide (ceria) powders and stable, high-concentration (> 1 M) ceria sols were prepared by a new method based on homogeneous precipitation in an acidic environment using cerium(IV) nitrate as the precursor. The results are compared with ceria powders and sols prepared by a hydrothermal method in a basic environment with cerium(III) nitrate as the precursor. Hydrolysis and condensation of the cerium(IV) and cerium(III) nitrates yield the ceria precursor precipitates with molecular formula of CeO2·2H2O [or Ce(OH)4] and CeO 2-H2O [or Ce(OH)2O], respectively. The dried ceria precursor powders from Ce(IV) and Ce-(III) are well dispersed in the form of primary particles of about 4 nm in size. Calcination at 450 °C causes phase transformation of the amorphous portion accompanying growth of the Ce(IV)-derived ceria crystallite or aggregation of the Ce(III)-derived ceria particles. The Ce(III)-derived ceria crystallites have a smaller lattice parameter than the Ce(IV)-derived sample whose lattice parameter decreases with increasing calcination temperature. Stable ceria sols at a solid concentration up to 300 g of CeO2/L were obtained from a Ce(IV)-derived ceria precursor powder, as compared to a maximum stable solid concentration of 20 g of CeO2/L for the Ce(III)-derived ceria sols. These results are discussed in terms of the shape and aggregation tendency of the primary ceria particles prepared by the two different methods.

Original languageEnglish (US)
Pages (from-to)3019-3025
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number12
StatePublished - Jun 9 2004
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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