Preparation of CeO2 Nanopowders by Hydrolysis and Oxidation of Cerium Carbide

doi:10.3724/SP.J.1077.2012.00489

Abstract

Abstract:

An effective route for the synthesis of CeO₂ nanopowders on a large scale was presented. High-quality CeO₂ nanopowders composed of nanoparticles with size of 3-5 nm were prepared by hydrolysis and oxidation of cerium carbide. The experimental variables which can tune the BET surface area of CeO₂ nanopowders, including hydrolysis reaction temperature, reaction time, as well as feed ratio of cerium carbide, were systematically. Experimental results indicate that the lower hydrolysis temperature (around room temperature), higher feed ratio (1:20 (g/mL)), and proper reaction time (18 h) can product CeO₂ nanopowders with higher surface area. The intermediate outcome Ce(OH)₃ and aimed product CeO₂ obtained with the optimized experimental variables (hydrolysis of cerium carbide powder at constant temperature (30℃) for 18 h in the suspension with feed ratio of 1:20 (g/mL) and dried at 80℃ for 4 h in the air) were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED), and UV-visible absorption spectrometer. It is found that the Ce(OH)₃is composed of a large quantity of rodlike nanostructures with length of 50-100 nm and diameter of 5-20 nm and the CeO₂ nanopowders have higher UV-Vis absorbance property. Furthermore, the CeO₂ nanopowders possess fine CO catalytic performance.

Key words: cerium carbide alloy, CeO₂ nanopowders, CO catalytic performance, hydrolysis and oxidation

CLC Number:

O611

WU Yi-Qing, NI Jian-Sen, DU Ya-Nan, HU Peng-Fei, DING Wei-Zhong, GENG Shu-Hua. Preparation of CeO₂Nanopowders by Hydrolysis and Oxidation of Cerium Carbide[J]. Journal of Inorganic Materials, 2012, 27(5): 489-494.

Figures/Tables 9

Fig. 1 XRD patterns of filter (a), CeO2 nanopowders (b) and commercial CeO2 (c)

Fig. 2 TEM (a) and HRTEM (b) images of Ce(OH)3 filters and the corresponding SAED(c)

Fig. 3 TEM (a) and HRTEM (b) images of CeO2 nanopowders

Fig. 4 Effect of reaction temperature on surface area of CeO2 nanopowders

Fig. 5 Effect of reaction time on surface area of CeO2 nanopowders

Fig. 6 Effect of feed ratio on surface area of CeO2 nanopowders

Fig. 7 Nitrogen adsorption-desorption isotherms (a) and pore distribution (b) of CeO2 nanopowders

Fig. 8 UV-Vis absorption spectra of CeO2 nanopowders (a) and commercial CeO2 (b)

Fig. 9 CO catalytic performance of CeO2 nanopowders

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Preparation of CeO₂Nanopowders by Hydrolysis and Oxidation of Cerium Carbide

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