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Synthesis and catalytic application of ceria nanoparticles and ceria-SiC composites

Published online by Cambridge University Press:  31 January 2011

Christian Schrage ,
Emanuel Kockrick  and
Stefan Kaskel
Christian Schrage
Affiliation:
[email protected], Dresden University of Technology, Inorganic Chemistry, Dresden, Germany
Emanuel Kockrick
Affiliation:
[email protected], Institut de recherches sur la catalyse et l’enviroment de lyon, Lyon, France
Stefan Kaskel
Affiliation:
[email protected], Dresden University of Technology, Inorganic Chemistry, Dresden, Germany
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Abstract

The synthesis of ceria nanoparticles using an inverse microemulsion technique and precipitation method was investigated. Ceria nanoparticles were synthesized by adding diluted ammonia to a microemulsion consisting of n-heptane, Marlophen NP5 and cerium nitrate. The micelle and particle size were adjustable in the range of 5-12nm by varying the molar ratio of water to surfactant and analyzed by dynamic light scattering (DLS), small angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM). After isolation through precipitation, the nanoparticles were subsequently treated at 100-600 °C. The catalytic activity of particles annealed at 400 and 600 °C were tested in soot combustion reactions and characterized by temperature-programmed oxidation (TPO) indicating a size-dependant activity. To prevent the nanoparticles from aggregation, the microemulsion technique was adopted to integrate the nanoparticles homogeneously into a mesoporous SiC matrix through the use of a preceramic polymer. The obtained composite material was also tested in soot combustion reactions.

Keywords

Cecatalyticnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y09-07
Copyright
Copyright © Materials Research Society 2010

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