کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1653843 | 1007673 | 2005 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, characterization and catalytic property of ceria spherical nanocrystals Synthesis, characterization and catalytic property of ceria spherical nanocrystals](/preview/png/1653843.png)
Ceria nanocrystals and CuO–CeO2 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 CeO2 was cubic phase with good crystallinity and narrow particle size distribution. CuO was in non-crystal form in the CuO–CeO2 composite. Temperature-programmed reduction (TPR) and X-ray photoelectron spectra (XPS) analysis of the CuO–CeO2 composite indicated a two-step reduction and the possible presence of reduced copper species. The CuO–CeO2 composite exhibited obviously higher catalytic activity than CeO2 due to the synergistic effect.
Journal: Materials Letters - Volume 59, Issue 22, September 2005, Pages 2769–2773