CO-OXIDATION CATALYZED BY NANOCRYSTALLINECeO2PARTICLES WITH DIFFERENT MORPHOLOGIES

W. Y. Pong, H. Y. Chang (), H. I. Chen and J. R. Chang
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W. Y. Pong: Department of Chemical Engineering, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
H. Y. Chang: Department of Chemical Engineering, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
H. I. Chen: Department of Chemical Engineering, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
J. R. Chang: Department of Chemical Engineering, National Chung Cheng University, 168 University Road, Min-Hsiung Chia-Yi, Taiwan

Surface Review and Letters (SRL), 2008, vol. 15, issue 01n02, 123-131

Abstract: Nanocrystalline cerium oxide(CeO2)particles prepared by the novel two-stage precipitation method were used for the catalysis ofCOoxidation. Firstly, two shapes, i.e. particulate(P-)and needle-like(N-),CeO2nanoparticles 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 theCeO2samples on the catalytic activity ofCOoxidation was investigated. From the experimental results, it indicated that the prepared samples were all nonporous and fcc-structuredCeO2. TheCeO2particles, 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. TheCOoxidation reaction showed that the catalytic activity ofN-CeO2nanoparticles was higher than that ofP-CeO2, attributing from the exposed higher-energy {100} and {110} facets forN-CeO2nanoparticles. Moreover, the calcined samples with higher degree of crystallinity showed further promotion in catalytic activity. It was also worthy to note, that by replacing theCeO2catalyst byPd/CeO2, a large increase in theCOconversion was found, especially catalyzed byPd/N-CeO2.

Keywords: CeO2; nanoparticles; CO oxidation; needle-like; catalysts (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X0801110X

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