The Role of Ionic and Cluster Active Centers of Pt/CeO2 Catalysts in CO Oxidation. Experimental Study and Mathematical Modeling Full article
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Chemical Engineering Science
ISSN: 0009-2509 , E-ISSN: 1873-4405 |
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| Output data | Year: 2023, Volume: 267, Article number : 118328, Pages count : 14 DOI: 10.1016/j.ces.2022.118328 | ||
| Tags | CO oxidation; Platinum-ceria catalysts; Cluster active centers; Low-temperature activity; Associative mechanism; Mathematical modeling | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0003 |
Abstract:
In this work, for the first time, the experimental catalytic kinetics of the CO oxidation reaction on platinum–ceria catalysts was simulated in a wide temperature range −50–450 °C. On the basis of the experiments performed, a substantiation of the catalytic action of two types of Pt-containing active centers in the form of isolated [Pt2+-O4] ions and PtOx clusters is presented. The relative content of these platinum forms on the ceria surface is controlled by the loading of platinum. Using the catalysts with a low content of platinum, where the active centers are isolated [Pt2+-O4] ions, a satisfactory simulation of CO conversion depending on temperature was carried out based on the concepts of the Mars-van Krevelen (MvK) mechanism. It was established that these centers provide the catalysts activity in the temperature range above 100 °C. To simulate the reaction kinetics in the temperature range below 100 °C, the Pt-O-Pt active centers based on PtOx cluster forms were considered. The PtOx cluster forms made it possible to consider both the MvK mechanism and temperature-dependent associative Low-T mechanism. The introduction into the kinetic scheme of stages simulating the implementation of both the Low-T and the MvK mechanisms allowed us to perform complete quantitative modeling of the experimental data over the entire temperature range of the reaction from −50 °C to 450 °C.
Cite:
Lashina E.A.
, Slavinskaya E.M.
, Stonkus O.A.
, Stadnichenko A.I.
, Romanenko A.V.
, Boronin A.I.
The Role of Ionic and Cluster Active Centers of Pt/CeO2 Catalysts in CO Oxidation. Experimental Study and Mathematical Modeling
Chemical Engineering Science. 2023. V.267. 118328 :1-14. DOI: 10.1016/j.ces.2022.118328 WOS Scopus РИНЦ AN OpenAlex
The Role of Ionic and Cluster Active Centers of Pt/CeO2 Catalysts in CO Oxidation. Experimental Study and Mathematical Modeling
Chemical Engineering Science. 2023. V.267. 118328 :1-14. DOI: 10.1016/j.ces.2022.118328 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Jun 16, 2022 |
| Accepted: | Nov 19, 2022 |
| Published online: | Nov 24, 2022 |
| Published print: | Mar 5, 2023 |
Identifiers:
| Web of science: | WOS:000921503000002 |
| Scopus: | 2-s2.0-85145600876 |
| Elibrary: | 54125830 |
| Chemical Abstracts: | 2022:3070912 |
| OpenAlex: | W4309921784 |