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- W2042704385 abstract "Ce1−XNiXO2 oxides with X varying from 0.05 to 0.5 were prepared by different methods and characterized by XRD and TPR techniques. Ce0.7Ni0.3O2 sample prepared by sol–gel method shows the highest reducibility and the highest catalytic activity for methane combustion. Three kinds of Ni phases co-exist in the Ce1−XNiXO2 catalysts prepared by sol–gel method: (i) aggregated NiO on the support CeO2, (ii) highly dispersed NiO with strong interaction with CeO2 and (iii) Ni atoms incorporated into CeO2 lattice. The distribution of different Ni species strongly depends on the preparation methods. The highly dispersed NiO shows the highest activity for methane combustion. The NiO aggregated on the support CeO2 shows lower catalytic activity for methane combustion, while the least catalytic activity is found for the Ni species incorporated into CeO2. Any oxygen vacancy formed in CeO2 lattice due to the incorporating of Ni atoms adsorbs and activates the molecular oxygen to form active oxygen species. So the highest catalytic activity for methane combustion on Ce0.7Ni0.3O2 catalyst is attributed not only to the highly dispersed Ni species but also to the more active oxygen species formed." @default.
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- W2042704385 date "2003-06-25" @default.
- W2042704385 modified "2023-10-11" @default.
- W2042704385 title "Reduction property and catalytic activity of Ce1−XNiXO2 mixed oxide catalysts for CH4 oxidation" @default.
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- W2042704385 doi "https://doi.org/10.1016/s0926-860x(02)00659-2" @default.
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