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- W2034766442 abstract "In this work isotopic exchange of 18O2 with 16O and oxidation of C16O were investigated at 130 °C on ceria-supported Au–CuO and Au–Co3O4 catalysts. Oxygen storage capacity (OSC) was measured at 400 °C to check the influence of the metals in the catalysts, resulting in an enhancement of OSC for gold-containing catalysts compared to monometallic catalysts. The reactivity of surface oxygen atoms and the oxygen availability from the samples were studied by two isothermal experiments, both feeding C16O (anaerobic oxidation C16O/Ar and aerobic oxidation C16O/O2) to the 18O pre-exchanged samples. Exchange leads to C18O formation and oxidation leads to C16O2, C16O18O and C18O2 formation. In anaerobic conditions the predominant reaction at the beginning is the exchange: a rapid exchange of C16O with the surface can be observed for all the samples except for CoCe that inhibits the exchange and the CO oxidation. In aerobic conditions, the predominant reaction is CO oxidation with the rapid increase of C16O2 due to the relatively high 16O coverage in reaction as a result of the C16O exchange and from exchange between 18O surface species and 16O bulk atoms. At 130 °C, bare ceria shows null activity in both aerobic and anaerobic oxidation." @default.
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- W2034766442 date "2015-06-01" @default.
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- W2034766442 title "Ceria-supported Au–CuO and Au–Co 3 O 4 catalysts for CO oxidation: An 18 O/ 16 O isotopic exchange study" @default.
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- W2034766442 doi "https://doi.org/10.1016/j.apcatb.2014.12.020" @default.
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