CO-oxidation catalyzed by nanocrystalline les with different morphologies

W. Y. Pong, H. Y. Chang, H. I. Chen, J. R. Chang

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2 Citations (Scopus)

Abstract

Nanocrystalline cerium oxide (CeO"2) particles prepared by the novel two-stage precipitation method were used for the catalysis of CO oxidation. Firstly, two shapes, i.e. particulate (P-) and needle-like (N-), CeO"2 nanoparticles were formed via proposed temperature-arranged routes. The crystalline structure, morphology, particle size, and surface area of samples were characterized by using XRD, TEM, HRTEM, and BET techniques. Furthermore, the morphological effect of the CeO"2 samples on the catalytic activity of CO oxidation was investigated. From the experimental results, it indicated that the prepared samples were all nonporous and fcc-structured CeO"2. The CeO"2 particles, as precipitating at 90°C for 5 min and then aging at 90°C, were particulate, whereas they were needle-like by aging at 0°C. The CO oxidation reaction showed that the catalytic activity of N-CeO"2 nanoparticles was higher than that of P-CeO"2, attributing from the exposed higher-energy {100} and {110} facets for N-CeO"2 nanoparticles. Moreover, the calcined samples with higher degree of crystallinity showed further promotion in catalytic activity. It was also worthy to note, that by replacing the CeO"2 catalyst by Pd/CeO"2, a large increase in the CO conversion was found, especially catalyzed by Pd/N-CeO"2.

Original languageEnglish
Pages (from-to)123-131
Number of pages9
JournalSurface Review and Letters
Volume15
Issue number1-2
DOIs
Publication statusPublished - 2008 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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