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CO and H₂ compete for the same active surface (lattice) oxygen species, but with a much lower reduction efficiency of H₂ compared to CO and CO–H₂ mixtures, during removal of active oxygen from a Au/CeO₂ catalyst by H₂, CO or CO/H₂ at temperatures between 30 and 300 °C.
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Wang et al. (2014) studied this question.
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