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• W2081369942 abstract "The influence of a chlorinated precursor on the redox properties of ceria was studied by comparing two Pt/CeO2–Al2O3 catalysts prepared from hexachloroplatinic acid and platinum acetylacetonate. In absence of chlorine, a dispersion value higher than 100% has been measured by irreversible hydrogen chemisorption. To interpret this result, the interaction of H2 with the support and the two catalysts were studied by magnetic measurements. The variations of the Ce3+ content have given evidence that different redox processes may occur. The hydrogen spillover is clearly observed in presence of platinum with the phenomenon being more pronounced for the ex-acetylacetonate catalyst. The limited amount of hydrogen irreversibly adsorbed at 294 K on the support for this free chlorine reduced catalyst is sufficient to explain the excessive value obtained for the platinum dispersion. The results show a fixation of chlorine on the supported ceria phase which inhibits the mobility of hydroxyl species responsible for the hydrogen spillover. Moreover, independently to the presence of chlorine, a reduction at 573 K seems to stabilise a significant fraction of Ce3+ ions against reoxidation under air at room temperature. This was not the case for bulk ceria and probably originates from ceria/alumina interactions occurring after reduction." @default.
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• W2081369942 date "1999-04-01" @default.
• W2081369942 modified "2023-10-11" @default.
• W2081369942 title "Magnetic study of the interaction of hydrogen with a Pt/CeO2–Al2O3 catalyst: influence of the presence of chlorine" @default.
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• W2081369942 doi "https://doi.org/10.1016/s0920-5861(98)00505-7" @default.
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