Abstract
Cu-based catalysts have been extensively used in methanol steam reforming(MSR)reactions because of their low cost and high efficiency.ZnO is often used in commercial Cu-based catalysts as both a structural and an electronic promoter to stabilize metal Cu nanoparticles and modify metal-support interfaces.Still,the further addition of chemical promoters is essential to further enhance the MSR reaction performance of the Cu/ZnO catalyst.In this work,CeO2-doped Cu/ZnO catalysts were prepared using the coprecipitation method,and the effects of CeO2 on Cu-based catalysts were systematically investigated.Doping with appropriate CeO2 amounts could stabilize small Cu nanoparticles through a strong interaction between CeO2 and Cu,leading to the formation of more Cu+-ZnOx interfacial sites.However,higher CeO2 contents resulted in the forma-tion of larger Cu nanoparticles and an excess of Cu+-CeOv interfacial sites.Consequently,the Cu/5CeO2/ZnO catalyst with maximal Cu-ZnO interfaces exhibited the highest H2 production rate of 94.6 mmolHi/(gcat·h),which was 1.5 and 10.2 times higher than those of Cu/ZnO and Cu/CeO2,respectively.
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