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Study of the preparation and properties of CeO2 single/multiwall hollow microspheres

Published online by Cambridge University Press:  31 January 2011

Youjin Zhang ,
Tao Cheng ,
Qixiu Hu ,
Zhiyong Fang  and
Kaidong Han
Youjin Zhang*
Affiliation:
Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Tao Cheng
Affiliation:
Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Qixiu Hu
Affiliation:
Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Zhiyong Fang
Affiliation:
Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Kaidong Han
Affiliation:
Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: zyj@ustc.edu.cn
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Abstract

Novel slight yellow CeO2single/multiwall hollow microspheres were synthesized by the hydrothermal method without any surfactant and characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), field-emission scanning electron microscopy (FESEM), and x-ray photoelectron spectra (XPS). The results showed that the products were CeO2single/multiwall hollow microspheres, the shells of which were composed of CeO2nanoparticles with a mean size of 70 nm. The effect of the preparation conditions, the reaction temperature, the reaction time, and the molar ratios of urea to Ce(NO3)3·6H2O on the morphology of the products, was investigated. The optimal preparation conditions are determined as follows: the reaction temperature of 230 °C, the reaction time of 6 to 10 h, and the molar ratios of urea to Ce(NO3)3·6H2O of 3:1 to 6:1. The formation mechanism of CeO2single/multiwall hollow microspheres was proposed. The ultraviolet-visible (UV-VIS) diffuse reflectance spectra of the samples were measured. The results showed that the absorption edges of the samples were red-shifted compared with that of bulk CeO2, and that the red-shift of the absorption edges and the yellow of the samples enhanced with increasing the yield of CeO2single/multiwall hollow microspheres. The catalytic activity and the recycling performance of the sample on CO oxidation were tested and the T100%(the temperature at which CO 100% conversion) was 230 °C in the first run and decreased by 270 and 205 °C compared with that of bulk CeO2and CeO2nanocrystal, respectively.

Keywords

CeMicrostructureOxide

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Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1472 - 1478
Copyright
Copyright © Materials Research Society2007

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