Abstract
Ceria nanocrystals and CuO–CeO 2 composite were prepared via alcohothermal technique using methanol as the solvent firstly and impregnation method. The catalytic activity of the samples was studied for low-temperature CO oxidation. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) showed that the prepared spherical CeO 2 was cubic phase with good crystallinity and narrow particle size distribution. CuO was in non-crystal form in the CuO–CeO 2 composite. Temperature-programmed reduction (TPR) and X-ray photoelectron spectra (XPS) analysis of the CuO–CeO 2 composite indicated a two-step reduction and the possible presence of reduced copper species. The CuO–CeO 2 composite exhibited obviously higher catalytic activity than CeO 2 due to the synergistic effect.
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