The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes Full article
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Catalysts
, E-ISSN: 2073-4344 |
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| Output data | Year: 2023, Volume: 13, Number: 1, Article number : 57, Pages count : 16 DOI: 10.3390/catal13010057 | ||||||
| Tags | catalyst; CO oxidation; manganese oxide; fluorite; solid solution; zirconia | ||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 075‐15‐2022‐263 |
Abstract:
MnOx‐ZrO2 catalysts prepared by co‐precipitation and vacuum impregnation were calcined at 400–800 °C and characterized by powder X‐ray diffraction, textural studies, high‐resolution transmission electron microscopy, temperature‐programmed reduction, X‐ray absorption near edge structure, and X‐ray photoelectron spectroscopy. The catalytic activity was tested in the CO oxidation reaction. The activity of the co‐precipitated samples exceeds that of the catalysts prepared by vacuum impregnation. The characterization studies showed that the nature of the active component for the catalysts obtained by co‐precipitation differs from that of the catalysts obtained by impregnation. In the impregnation series, the most active catalyst was obtained at a temperature of 400 °С; its increased activity is due to the formation of MnO2 oxide nanoparticles containing Mn4+ and lowtemperature reducibility. An increase in the synthesis temperature leads to the formation of less active Mn2O3, catalyst sintering, and, accordingly, deterioration of the catalytic properties. In the case of co‐precipitation, the most active CO oxidation catalysts are formed by calcination at 650–700 °C in air. In this temperature interval, on the one hand, a MnyZr1‐yO2‐x solid solution is formed, and on the other hand, a partial separation of mixed oxide begins with the formation of highly dispersed and active MnOx. A further increase in temperature to 800 °C leads to complete decomposition of the solid solution, the release of manganese cations into Mn3O4, and a drop in catalytic activity.
Cite:
Bulavchenko O.A.
, Konovalova V.P.
, Saraev A.A.
, Kremneva A.M.
, Rogov V.A.
, Gerasimov E.Y.
, Afonasenko T.N.
The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes
Catalysts. 2023. V.13. N1. 57 :1-16. DOI: 10.3390/catal13010057 WOS Scopus РИНЦ OpenAlex
The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes
Catalysts. 2023. V.13. N1. 57 :1-16. DOI: 10.3390/catal13010057 WOS Scopus РИНЦ OpenAlex
Dates:
| Submitted: | Nov 14, 2022 |
| Accepted: | Dec 23, 2022 |
| Published online: | Dec 27, 2022 |
| Published print: | Jan 1, 2023 |
Identifiers:
| Web of science: | WOS:000914727400001 |
| Scopus: | 2-s2.0-85146705500 |
| Elibrary: | 53957566 |
| OpenAlex: | W4312224699 |