In this work, CuO-TiO₂ nanoparticles with different CuO mass contents of 2%, 8%, 12%, and 20% are synthesized by flame spray pyrolysis (FSP) method and applied to catalytic combustion of lean CO. The nano-catalyst is characterized by N₂-physisorption isotherms, X-ray diffraction (XRD), transmission electron microscopy (TEM), H₂-TPR (temperature-programmed reduction) and X-ray photoelectron spectroscopy (XPS). All the catalysts possess a high specific surface area, of which the CuO-TiO₂ nanoparticles with 2 wt.% Cu (2CT) is as high as 98 m²/g, and exhibits a spherical structure with a diameter of 15–20 nm. Compared with other methods, the FSP method can significantly improve the loading of CuO without producing large crystalline CuO particles on the catalyst surface. Interestingly, the addition of CuO will essentially change the lattice structure of TiO₂ for all catalysts, including its crystal spacing and XRD diffraction angle. Copper cations are embedded in TiO₂ lattice to promote the transformation from anatase to rutile by producing oxygen defect at high flame temperature. The interaction between CuO and TiO₂ has significant influence on its physicochemical properties. A lower onset reduction temperature on the sample with higher CuO loading is obtained due to the hydrogen spillover effect in H₂-TPR test. Moreover, the loaded CuO increases the content of more stable rutile phase in the materials, so that it reduces the strong metal-support interaction (SMSI) effect of CuO and anatase phase to improve the properties of CO catalytic combustion. The synthesized CuO-TiO₂ nanoparticles can achieve complete combustion conversion of lean CO at lower temperature of 120°C.

本文通过火焰喷雾热解法（FSP）合成了CuO质量分数分别为2％，8％，12％和20％的CuO-TiO ₂纳米颗粒，并将其应用于稀薄CO的催化燃烧。其特征在于N _2-物理吸附等温线，X射线衍射（XRD），透射电子显微镜（TEM），H ₂ -TPR（程序升温还原）和X射线光电子能谱（XPS）。所有催化剂均具有较高的比表面积，其中具有2 wt％的Cu（2CT）的CuO-TiO ₂纳米粒子高达98 m ²/ g，并呈现出直径为15–20 nm的球形结构。与其他方法相比，FSP方法可以显着提高CuO的负载量，而不会在催化剂表面产生大的结晶CuO颗粒。有趣的是，对于所有催化剂，CuO的添加将实质上改变TiO ₂的晶格结构，包括其晶体间距和XRD衍射角。铜阳离子嵌入TiO ₂晶格中，通过在高火焰温度下产生氧缺陷来促进从锐钛矿向金红石的转变。CuO与TiO ₂的相互作用对其理化性质有重要影响。由于H ₂ -TPR测试中的氢气溢出效应，在具有较高CuO负载的样品上获得了较低的起始还原温度。而且，负载的CuO增加了材料中更稳定的金红石相的含量，从而降低了CuO和锐钛矿相的强金属-载体相互作用（SMSI）作用，从而改善了CO催化燃烧的性能。合成的CuO-TiO ₂纳米粒子可以在120℃的较低温度下完全实现贫CO的燃烧转化。