【摘要】 采用水热法制备了一系列不同Ce/Ni物质的量比的纳米棒CeO₂（x）-NiO催化剂。运用低温N₂吸附-脱附、XRD、TEM、拉曼光谱、H₂-TPR及XPS等技术对催化剂的形貌、结构进行了表征。考察了Ce/Ni物质的量比对CeO₂（x）-NiO催化剂形貌及富氢气氛下CO选择性氧化（CO PROX）反应性能的影响。TEM测试结果表明,调变Ce/Ni物质的量比可制得不同粒径的CeO₂（x）-NiO纳米棒催化剂。H₂-TPR测试结果表明,将NiO掺入CeO₂可提升Ce O₂（x）-NiO催化剂的氧化还原能力。拉曼光谱及XPS测试结果表明,镍含量较低时,CeO₂（x）-NiO催化剂表面活性氧物种及氧空位含量均较多,利于提升其催化性能。CO PROX催化性能测试结果显示,镍含量较低的CeO₂（0.89）-NiO纳米棒催化剂的活性和选择性最好,在170-220℃的反应条件下,CO转化率为100%,CO₂选择性为52%。更多还原

【Abstract】 A series of nanorod CeO₂（x）-NiO composite oxides catalysts with different Ce/Ni molar ratios have been synthesized by hydrothermal method.Their morphology and structure were characterized by N₂ sorptiondesorption,XRD,TEM,Raman spectra,H₂-TPR and XPS.The effects of Ce/Ni molar ratio on the morphology and catalytic activity of CeO₂（x）-NiO composite oxides catalysts for CO preferential oxidation（CO PROX）in hydrogen-rich stream were studied.TEM results indicate that nanorod Ce02（x）-NiO composite oxides catalysts with different sizes can be obtained by adjusting Ce/Ni molar ratio.H₂-TPR results show that introduction of NiO into CeO₂ enhance the redox ability of CeO₂（x）-NiO composite oxides catalysts.Raman spectra and XPS results indicate that CeO₂（x）-NiO composite oxides catalysts with low nickel content have much more active oxygen species and oxygen vacancies,which are beneficial to improve its catalytic performance.CeO₂（0.89）-NiO nanorod catalysts with low nickel content exhibits the highest activity and CO₂ selectivity,the CO conversion is100% and the CO₂ selectivity is about 52% in the reaction temperature range of 170-220℃ for CO PROX in hydro gen-rich stream.更多还原