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• W1987880003 endingPage "345" @default.
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• W1987880003 abstract "The surface reduction and oxidation of nanocrystalline CeO2 and CuO/CeO2 was investigated by temperature-programmed reduction (TPR) and isothermal/temperature-programmed oxidation (TPO) measurements. Samples with Cu concentrations in the range of 5–20% were prepared by homogeneous precipitation and characterized with regard to their composition, structure, and specific surface area. The quantitative analysis of H2 TPR measurements of the mixed oxides indicated that (i) the majority of the copper component was completely reduced at temperatures below 473 K and (ii) chemisorption of hydrogen occurred at T=375 K, catalyzed by the copper oxide. The reoxidation of the samples with N2O could also be separated into two partial reactions: (i) a reaction of N2O with adsorbed hydrogen at room temperature and (ii) the oxidation of the reduced copper component between 343 and 573 K. Annealing of Cu0.08Ce0.92O2−x at temperatures above 1073 K resulted in the precipitation of a copper oxide phase, as was evident from X-ray diffraction (XRD). Changes in the morphology of the copper component, induced by high-temperature annealing, had a significant effect on the N2O TPO profile even after annealing at temperatures below 1073 K, where XRD was not sensitive." @default.
• W1987880003 created "2016-06-24" @default.
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• W1987880003 date "2002-01-01" @default.
• W1987880003 modified "2023-10-05" @default.
• W1987880003 title "Temperature-Programmed Reaction Spectroscopy of Ceria- and Cu/Ceria-Supported Oxide Catalyst" @default.
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• W1987880003 doi "https://doi.org/10.1006/jcat.2001.3461" @default.
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