Synthesis and catalytic properties of microemulsion-derived cerium oxide nanoparticles
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
The synthesis of cerium dioxide nanoparticles using an inverse microemulsion technique and precipitation method was investigated. Cerium hydroxide nanoparticles were synthesized by adding diluted ammonia to n-heptane-surfactant-cerium nitrate system. The micelle and particle size in the range of 5-12 nm were controlled by varying the molar water to surfactant ratio and analyzed by dynamic light scattering (DLS), small angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM). Cerium hydroxide nanoparticles were isolated and subsequently treated at 100-600 °C to obtain nanoscale ceria. Crystallite sizes of cerium dioxide in the range of 6-16 nm were estimated by Scherrer analysis by X-ray diffraction (XRD) and HRTEM. The catalytic activity of particles annealed at 400 and 600 °C in soot combustion reactions was characterized by temperature-programmed oxidation (TPO) indicating a size-dependant activity. Crystallite sizes and catalytic stability of elevated ceria systems were tested in second combustion cycles.
Details
Original language | English |
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Pages (from-to) | 1614-1620 |
Number of pages | 7 |
Journal | Journal of solid state chemistry |
Volume | 181 |
Issue number | 7 |
Publication status | Published - Jul 2008 |
Peer-reviewed | Yes |
Keywords
ASJC Scopus subject areas
Keywords
- Catalysis, Ceria nanoparticles, Dynamic light scattering, Inverse microemulsion, Small angle X-ray scattering, Soot combustion