Journal of Materials Research

Articles

Flame-made Ceria Nanoparticles

L. Mädlera1, W. J. Starka1 and S. E. Pratsinisa1 c1

a1 Institute of Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland

Abstract

Flame spray pyrolysis (FSP) has been used to synthesize high-surface-area ceria from cerium acetate in acetic acid solution. With the addition of an iso-octane/2-butanol mixture to that solution, homogeneous CeO2 nanoparticles were obtained. The specific surface area of the powders ranged from 240 to 101 m2/g by controlling the oxygen dispersion and liquid precursor flow rates through the flame. Furthermore, for production rates from 2 to 10 g/h a constant average primary particle size could be obtained at selected process parameters. The ceria showed high crystallinity and primary particles with a stepped surface. The powder exhibited good thermal stability and conserved up to 40% of its initial specific surface area when calcinated for 2 h at 900 °C. This shows the potential of FSP made ceria for high-temperature applications as in three-way catalysts or fuel cells.

(Received January 11 2002)

(Accepted March 12 2002)

Correspondence:

c1 Address all correspondence to this author. e-mail: pratsinis@ivuk.mavt.ethz.ch

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