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Oxidation of carbon monoxide in the presence of hydrogen on the CuO, CoO, and Fe2O3 oxides supported on ZrO2

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The catalytic activity of the CuO/ZrO2, CoO/ZrO2, Fe2O3/ZrO2, and CuO/(CoO, Fe2O3)/ZrO2 systems in the reaction of selective CO oxidation in the presence of hydrogen was studied at 20–450°C over the oxide concentration range of 2.5–10 wt % on the surface of ZrO2. The conversion of CO on the CoO/ZrO2 systems was almost independent of the concentration of CoO: 88 or 90% for 2.5 or 10% CoO, respectively. TPR data allowed us to relate the catalytic activity of CoO/ZrO2 to Co-O-Zr clusters, the amount of which was almost constant over the test range of CoO concentrations. The conversion of CO on 2.5% CuO/ZrO2 was 32% (190°C) or 62–66% on 5–10% CuO/ZrO2 (170°C). According to TPR data, clusters like Cu-O-Zr occurred on the surface of ZrO2, and the amount of these clusters reached a maximum upon supporting 5% CuO. The catalytic properties of 5% CuO/5% CoO/ZrO2 and 5% CoO/5% CuO/ZrO2 samples were identical to those of 5% CuO/ZrO2 samples. It is likely that the formation of active reaction sites upon consecutively supporting the oxides occurred on the same surface sites of ZrO2. In this case, Co and Cu oxides competed for cluster formation, and the copper cation can displace the cobalt cation from the formed clusters. The Fe2O3 samples were inactive; a maximum conversion of 34% (290°C) was observed on 10% Fe2O3/ZrO2. The catalytic properties of CuO/Fe2O3/ZrO2 were also identical to those of CuO/ZrO2, and they depended on the presence of Cu-O-Zr clusters on the surface.

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Correspondence to V. N. Korchak.

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Original Russian Text © A.A. Firsova, T.I. Khomenko, O.N. Sil’chenkova, V.N. Korchak, 2010, published in Kinetika i Kataliz, 2010, Vol. 51, No. 2, pp. 317–329.

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Firsova, A.A., Khomenko, T.I., Sil’chenkova, O.N. et al. Oxidation of carbon monoxide in the presence of hydrogen on the CuO, CoO, and Fe2O3 oxides supported on ZrO2 . Kinet Catal 51, 299–311 (2010). https://doi.org/10.1134/S0023158410020205

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