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Activity of 5% CuO/Ce1 – xPrxOy Catalysts in the Reaction of Carbon Monoxide Oxidation with Oxygen in an Excess of Hydrogen

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Abstract

The 5% CuO/Ce1 – xPrxOy catalysts were synthesized on the basis of CeO2 and PrO2 oxides and Ce1 – xPrxOy solid solutions with x = 0.2, 0.5, and 0.8. Highly dispersed copper oxide was present in the 5%CuO/Ce1 – xPrxOy catalysts. Upon interaction with the support, it formed active oxygen, which participated in CO chemisorption and a low-temperature reaction of CO oxidation in the presence of hydrogen. The highest conversion of CO in an excess of H2 (γmах(Т)), which was close to 100%, was obtained at temperatures of 120–160°C on a 5% CuO/CeO2 catalyst. Upon the modification of CeO2 with Pr cations, 5% Ce0.2Pr0.8Oy sample, it decreased to 65% at 220°C due to an increase in the bond strength of oxygen in copper-containing centers. A maximum conversion of CO (93%) on a sample of 5% CuO/PrOy was detected at 200°C. Upon the modification of PrO2 with Ce cations, the activity of 5% CuO/Ce0.5Pr0.5Oy and 5% CuO/Ce0.2Pr0.8Oy catalysts did not exceed that of 5% CuO/PrOy. The forms of CO and CO2 adsorption on 5% CuO/Ce1 – xPrxOy samples were studied using the TPD method. In a range of 170–500°C, the desorption of oxygen from the supports of 5% CuO/Ce0.5Pr0.5Oy and 5% CuO/PrOy samples was observed. The occurrence of the reaction on 5% CuO/Ce1 – xPrxOy catalysts was discussed. With consideration for the properties of CO complexes formed on copper-containing oxidation and adsorption centers, their participation in the reaction of low-temperature oxidation in hydrogen was examined.

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Funding

This work was carried out within the framework of a state contract of the Federal Agency for Scientific Organizations of Russia (V.46.13, 0082-2014-0007, project 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 V. Makhlyarchuk

Abbreviations and designations: TPR-H2, temperature-programmed reduction with hydrogen; TPD, temperature-programmed desorption; BET, Brunauer–Emmett–Teller method; γ, conversion of CO, %; β, conversion of О2, %; \(N_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}^{{{\text{des}}}}{\text{,}}\) amount of desorbed CO2; \(N_{{{\text{CO}}}}^{{{\text{des}}}}{\text{,}}\) amount of desorbed CO; \(N_{{{\text{CO + C}}{{{\text{O}}}_{{\text{2}}}}}}^{{{\text{des}}}}{\text{,}}\) total amount of desorbed gas; L, crystallite size; Ssp, specific surface area; \({{N}_{{{{{\text{H}}}_{{\text{2}}}}}}}{\text{,}}\) total amount of absorbed hydrogen per square meter of oxide; Nc, calculated amount of hydrogen required for the reduction of copper oxide in the sample; \({{V}_{{{{{\text{H}}}_{{\text{2}}}}}}}{\text{,}}\) rate of oxygen consumption in reaction with hydrogen; and VCO, rate of oxygen consumption in reaction with carbon monoxide.

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Il’ichev, A.N., Bykhovsky, M.Y., Fattakhova, Z.T. et al. Activity of 5% CuO/Ce1 – xPrxOy Catalysts in the Reaction of Carbon Monoxide Oxidation with Oxygen in an Excess of Hydrogen. Kinet Catal 62, 116–126 (2021). https://doi.org/10.1134/S0023158421010031

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