Oxidation of CO on the FeO x /Pt/TiO2 catalyst is markedly enhanced by H2 and/or H2O at 60 °C, but no such enhancement is observed on the Pt/TiO2 catalyst, but shift reaction (CO + H2O → H2 + CO2) does not occur on the FeO x /Pt/TiO2 catalyst at 60 °C. DRIFT-IR spectroscopy reveals that the fraction of bridge bonded CO increases while that of linearly bonded CO decreases on the FeO x loaded Pt/TiO2 catalyst. The in-situ DRIFT IR spectra proved that the bridged CO is more reactive than the linearly bonded CO with respect to O2, and the reaction of the bridge-bonded CO with O2 as well as of the linearly bonded CO is markedly enhanced by adding H2 to a flow of CO + O2. From these results, we deduced that the promoting effect of H2 and/or H2O is responsible for the preferential oxidation (PROX) reaction of CO on the FeO x /Pt/TiO2 catalyst, and a following new mechanism via the hydroxyl carbonyl or bicarbonate intermediate is proposed for the oxidation of CO in the presence of H2O.
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Tanaka, KI., Shou, M., He, H. et al. Significant enhancement of the oxidation of CO by H2 and/or H2O on a FeO x /Pt/TiO2 catalyst. Catal Lett 110, 185–190 (2006). https://doi.org/10.1007/s10562-006-0107-x
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DOI: https://doi.org/10.1007/s10562-006-0107-x