The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes Full article
| Journal |
Catalysts
ISSN: 2073-4344 |
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| Output data | Year: 2023, Volume: 13, Number: 1, Article number : 57, Pages count : 15 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 °C; its increased activity is due to the formation of MnO2 oxide nanoparticles containing Mn4+ and low-temperature 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 :1-15. DOI: 10.3390/catal13010057 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_ihcp_identifier_type
The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes
Catalysts. 2023. V.13. N1. 57 :1-15. DOI: 10.3390/catal13010057 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_ihcp_identifier_type
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 |
| Chemical Abstracts: | 2023:199932 |
| OpenAlex: | W4312224699 |
| publication_identifier.sciact_ihcp_identifier_type: | 3907 |