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Pattern of the Activity of (0.5–15)%CoO/CeO2 Catalysts in Carbon Monoxide Oxidation with Oxygen in Excess Hydrogen

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Abstract

Samples of (0.5–15)%CoO/CeO2, Co3O4, and CeO2 have been studied in the oxidation of CO to CO2 in a CO+O2+H2 mixture in a range of 40–340°C. The highest activity in CO oxidation is exhibited by 10%CoO/CeO2 with a characteristic conversion of CO to CO2 of γ50 = 50% at Т50 ≈ 140°С and γ ≈ 100% at Т = 180–220°С. The СО2 yield decreases at 220–240°C due to competition for oxygen in the CO and H2 oxidation reactions; at Т > 240°C, it decreases due to the consumption of CO in the methanation reaction. According to XRD and H2-TPR, cobalt oxide in the 10%CoO/CeO2 sample is present in two forms of a highly dispersed Co3O4 oxide (CoxOy clusters) interacting with the support and in the form of a Co3O4 phase. Carbon monoxide oxidation in a range of 60–180°C occurs on CoxOy clusters. Under these conditions, the activity of particles of the Co3O4 phase in pure oxide and the 10%CoO/CeO2 catalyst is lower than that of the clusters. The effect of the properties of adsorption complexes formed involving the oxygen contained in the clusters and in the gas phase on the temperature dependence of CO conversion has been studied.

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Funding

This work was performed under a state task of the Federal Agency for Scientific Organizations of the Russian Federation (subject V.46.13, 0082-2014-0007, no. AAAA-A18-118020890105-3).

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991, Moscow, Russia

    A. N. Il’ichev, M. Ya. Bykhovsky, Z. T. Fattakhova, D. P. Shashkin & V. N. Korchak

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  1. A. N. Il’ichev
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  2. M. Ya. Bykhovsky
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  3. Z. T. Fattakhova
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  4. D. P. Shashkin
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  5. V. N. Korchak
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Correspondence to A. N. Il’ichev.

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Translated by M. Timoshinina

Abbreviations and notation: XRD, X-ray diffraction analysis; H2-TPR, temperature-programmed reduction with hydrogen; BET, Brunauer–Emmett–Teller method

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Il’ichev, A.N., Bykhovsky, M.Y., Fattakhova, Z.T. et al. Pattern of the Activity of (0.5–15)%CoO/CeO2 Catalysts in Carbon Monoxide Oxidation with Oxygen in Excess Hydrogen. Kinet Catal 63, 505–514 (2022). https://doi.org/10.1134/S0023158422050044

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