Abstract
Low-temperature oxidation of carbon monoxide on the Pd/γ-Al2O3 catalyst has been studied at room temperature and atmospheric pressure of air containing 100 mg/m3 CO. The catalyst became gradually deactivated during the process. Storage of the partially deactivated catalyst in air for 10–12 h resulted in a complete recovery of activity. According to XPS data, the material obtained by depositing Pd3(OAc)6 on γ-Al2O3 before contact with CO contains palladium compounds in the oxidation states I and 0. The specific catalytic activity of palladium compounds in different oxidation states was evaluated based on the correlation between the catalytic activity and the content of Pd(I) and Pd(0) compounds, and it was shown that the activity of the former is higher than that of the latter.
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ACKNOWLEDGMENTS
We are grateful to O.N. Shishilov, Cand. Sci. (Chem.), senior lecturer in general chemical technology, Lomonosov Institute of Fine Chemical Technologies (Russian Technological University MIREA) for providing us with palladium acetate for the preparation of catalysts and to E.A. Skryleva, researcher of the Materials Science and Metallurgy Multiaccess Center of Moscow State Institute of Steel and Alloys for performing the XPS studies.
Funding
This study was supported by the Russian Foundation for Basic Research (grant no. 16-33-00482 “Kinetics and mechanism of the low-temperature oxidation of carbon monoxide with oxygen on supported palladium catalysts”).
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Translated by L. Smolina
Abbreviations and notation: XPS, X-ray photoelectron spectroscopy.
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Ustyugov, A.V., Korypaeva, V.V., Obeidat, Z.Z. et al. Comparison of the Activities of Pd(0) and Pd(I) in Low-Temperature Oxidation of Carbon Monoxide on the Pd/γ-Al2O3 Catalyst. Kinet Catal 63, 226–233 (2022). https://doi.org/10.1134/S0023158422020112
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DOI: https://doi.org/10.1134/S0023158422020112