A series of CuO/CeO₂ catalysts were successfully synthesized via solution combustion method (SCS) using different fuels and tested for CO oxidation. The catalysts were characterized by energy-dispersive X-ray analysis (EDXA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), N₂ adsorption-desorption isotherms and H₂ temperature-programmed reduction (H₂-TPR). It was found that the used fuels strongly affected the characterization and the low-temperature reduction behavior of CuO/CeO₂ catalysts. The CuO/CeO₂-urea catalyst exhibited higher catalytic activity toward CO oxidation (t₅₀=120∘C, t₁₀₀=159∘C) than the 5 other synthesized catalysts. In addition, the CuO/CeO₂-urea catalyst displayed high stability for CO oxidation during five cycles and water resistance. The enhanced catalytic CO oxidation of the synthesized samples can be attributed by a combination of factors, such as smaller crystallite size, higher specific surface area, larger amount of amorphous copper(II) oxide, more mesoporous and uniform spherical-like structure. These findings are worth considering in order to continue the study of the CuO/CeO₂ catalyst with low-temperature CO oxidation.

中文翻译：

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通过溶液燃烧法合成的CuO / CeO2纳米复合材料上CO的催化氧化：燃料的作用

通过溶液燃烧法（SCS）使用不同的燃料成功合成了一系列CuO / CeO ₂催化剂，并测试了CO氧化。通过能量色散X射线分析（EDXA），X射线衍射（XRD），傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM），N ₂吸附-解吸等温线和H ₂温度对催化剂进行了表征。编程还原（H ₂ -TPR）。发现用过的燃料强烈影响CuO / CeO ₂催化剂的特性和低温还原行为。CuO / CeO _2-脲催化剂对CO氧化表现出更高的催化活性（t ₅₀＝120∘C，t ₁₀₀＝159∘C）。另外，CuO / CeO _2-脲催化剂对五个循环中的CO氧化和耐水性表现出高稳定性。合成样品催化CO氧化的增强可归因于多种因素的组合，例如较小的微晶尺寸，较高的比表面积，较大量的无定形氧化铜（II），中孔和均匀球形结构。为了继续研究低温CO氧化的CuO / CeO ₂催化剂，这些发现值得考虑。