Abstract
A series of mono- and bimetallic cobalt–cerium catalysts based on ZSM-5 zeolite with different silicate moduli (SiO2/Al2O3 = 30, 55, and 80) was synthesized by incipient wetness impregnation. The atomic ratio of metals (Co + Ce)/Al in bimetallic samples ranged from 0.5 to 1.5. A synergistic catalytic effect of cobalt and cerium in the prepared composites manifested itself in the reactions of total and preferential oxidation of CO (CO-PROX) in an excess of hydrogen. The catalysts in which an atomic ratio between Co and Ce was close to 3 were the most active. In these cases, the conversion of CO in the CO-PROX reaction reached 95% at 190–200°C. With the use of TEM, SEM, and DRIFT spectroscopy of adsorbed CO, including in situ studies of reduction processes under the action of CO, it was found that cobalt oxo cations and mixed cobalt and cerium oxo cations located in exchange positions of the zeolite play a key role in the oxidation reactions. The use of zeolite with SiO2/Al2O3 = 55 provided an optimal balance between the high activity of Co/Ce catalysts in CO oxidation and the selectivity of CO2 formation in the presence of hydrogen.
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ACKNOWLEDGMENTS
We are grateful to S.V. Maksimov and K.I. Maslakov for conducting TEM and low-temperature nitrogen adsorption studies.
Funding
This work was carried out within the framework of state contract nos. АААА-А21-121011590090-7 and 0082-2019-0011. The studies were supported by the Moscow State University Development Program.
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Translated by V. Makhlyarchuk
Abbreviations and notation: CO-PROX, preferential oxidation of CO in excess of hydrogen; TEM, transmission electron microscopy; SEM, scanning electron microscopy; AES, atomic emission spectroscopy; EDX, energy dispersive X-ray analysis; BET, Brunauer–Emmett–Teller method; DRIFT, diffuse reflectance infrared Fourier transform.
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Ivanin, I.A., Krotova, I.N., Udalova, O.V. et al. Synergistic Catalytic Effect of Cobalt and Cerium in the Preferential Oxidation of Carbon Monoxide on Modified Co/Ce/ZSM-5 Zeolites. Kinet Catal 62, 798–811 (2021). https://doi.org/10.1134/S0023158421060082
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DOI: https://doi.org/10.1134/S0023158421060082