The redox properties of CeO₂-WO₃ mixed oxide supported on multi-walled carbon nanotubes (MWCNTs) and TiO₂ were investigated in terms of valence state and active oxygen species. Ce–W/CNT and Ce–W/TiO₂ were synthesized by impregnation method to support CeO₂-WO₃ mixed oxide on CNTs and TiO₂. The interplanar distance of CeO₂ in Ce–W/CNT was measured to be 0.316 nm by TEM and SAED pattern analysis, which was larger than that of Ce–W/TiO₂ (0.310 nm), indicating the lattice expansion due to Ce³⁺ formation. Since the F_2g and O_v peaks in Raman spectrum of Ce–W/CNT were broader than those of Ce–W/TiO₂, it implied the increased oxygen vacancies of CeO₂ supported on CNTs. In XPS analysis, Ce³⁺/(Ce⁴⁺+Ce³⁺) ratios in Ce–W/CNT and Ce–W/TiO₂ were 42.28% and 28.60%, and O_α/(O_α+O_β) ratios were 29.07% and 17.29%, respectively. The redox properties of the catalysts were investigated by H₂-TPR analysis. The reduction peak of Ce–W/CNT shifted to a lower temperature compared to Ce–W/TiO₂, and H₂ consumption increased by 1.91 mmol/g, increasing the redox properties. The reduction in the valence state of Ce⁴⁺ was caused by charge transfer between CNT and CeO₂-WO₃ mixed oxide, and the reduction promoted the formation of oxygen vacancies and active oxygen species.

研究了多价碳纳米管（MWCNTs）和TiO ₂上负载的CeO ₂ -WO ₃复合氧化物的氧化还原性质。通过浸渍法合成了Ce–W / CNT和Ce–W / TiO ₂，将CeO ₂ -WO ₃混合氧化物负载在CNT和TiO _2上。通过TEM和SAED图案分析，Ce–W / CNT中CeO ₂的晶面间距为0.316 nm，大于Ce–W / TiO ₂（0.310 nm），表明Ce ³引起的晶格膨胀⁺阵型。由于F _2g和O _vCe-W / CNT的拉曼光谱峰宽于Ce-W / TiO _2的峰，这表明负载在CNT上的CeO _2的氧空位增加。在XPS分析中，铈³⁺ /（铈⁴⁺ +的Ce ³⁺）比率的Ce-W / CNT和Ce-W /二氧化钛₂分别为42.28％和28.60％，和O _α /（O _α + O _β）的比率分别为29.07％和17.29％。通过H ₂ -TPR分析研究了催化剂的氧化还原性质。与Ce–W / TiO ₂和H ₂相比，Ce–W / CNT的还原峰移至更低的温度消耗量增加了1.91 mmol / g，从而提高了氧化还原性能。Ce ⁴⁺的价态下降是由于CNT与CeO ₂ -WO ₃混合氧化物之间的电荷转移引起的，并且这种下降促进了氧空位和活性氧的形成。