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Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution. / Cherepanova, Svetlana V; Koemets, Egor G; Gerasimov, Evgeny Yu и др.

в: Materials, Том 16, № 18, 6216, 14.09.2023.

Результаты исследований: Научные публикации в периодических изданияхстатьяРецензирование

Harvard

Cherepanova, SV, Koemets, EG, Gerasimov, EY, Simentsova, II & Bulavchenko, OA 2023, 'Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution', Materials, Том. 16, № 18, 6216. https://doi.org/10.3390/ma16186216

APA

Vancouver

Cherepanova SV, Koemets EG, Gerasimov EY, Simentsova II, Bulavchenko OA. Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution. Materials. 2023 сент. 14;16(18):6216. doi: 10.3390/ma16186216

Author

Cherepanova, Svetlana V ; Koemets, Egor G ; Gerasimov, Evgeny Yu и др. / Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution. в: Materials. 2023 ; Том 16, № 18.

BibTeX

@article{893c448f636948c1ae382a66d2feed73,
title = "Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution",
abstract = "The reduction of Co-based oxides doped with Al3+ ions has been studied using in situ XRD and TPR techniques. Al3+-modified Co3O4 oxides with the Al mole fraction Al/(Co + Al) = 1/6; 1/7.5 were prepared via coprecipitation, with further calcination at 500 and 850 °C. Using XRD and HAADF-STEM combined with EDS element mapping, the Al3+ cations were dissolved in the Co3O4 lattice; however, the cation distribution differed and depended on the calcination temperature. Heating at 500 °C led to the formation of an inhomogeneous (Co,Al)3O4 solid solution; further treatment at 850 °C provoked the partial decomposition of mixed Co-Al oxides and the formation of particles with an Al-depleted interior and Al-enriched surface. It has been shown that the reduction of cobalt oxide by hydrogen occurs via the following transformations: (Co,Al)3O4 → (Co,Al)O → Co. Depending on the Al distribution, the course of reduction changes. In the case of the inhomogeneous (Co,Al)3O4 solid solution, Al stabilizes intermediate Co(II)-Al(III) oxides during reduction. When Al3+ ions are predominantly on the surface of the Co3O4 particles, the intermediate compound consists of Al-depleted and Al-enriched Co(II)-Al(III) oxides, which are reduced independently. Different distributions of elemental Co and Al in mixed oxides simulate different types of the interaction phase in Co3O4/γ-Al2O3-supported catalysts. These changes in the reduction properties can significantly affect the state of an active component of the Co-based catalysts.",
author = "Cherepanova, {Svetlana V} and Koemets, {Egor G} and Gerasimov, {Evgeny Yu} and Simentsova, {Irina I} and Bulavchenko, {Olga A}",
note = "This research was supported by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2022-263).",
year = "2023",
month = sep,
day = "14",
doi = "10.3390/ma16186216",
language = "English",
volume = "16",
journal = "Materials",
issn = "1996-1944",
publisher = "MDPI AG",
number = "18",

}

RIS

TY - JOUR

T1 - Reducibility of Al3+-Modified Co3O4: Influence of Aluminum Distribution

AU - Cherepanova, Svetlana V

AU - Koemets, Egor G

AU - Gerasimov, Evgeny Yu

AU - Simentsova, Irina I

AU - Bulavchenko, Olga A

N1 - This research was supported by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2022-263).

PY - 2023/9/14

Y1 - 2023/9/14

N2 - The reduction of Co-based oxides doped with Al3+ ions has been studied using in situ XRD and TPR techniques. Al3+-modified Co3O4 oxides with the Al mole fraction Al/(Co + Al) = 1/6; 1/7.5 were prepared via coprecipitation, with further calcination at 500 and 850 °C. Using XRD and HAADF-STEM combined with EDS element mapping, the Al3+ cations were dissolved in the Co3O4 lattice; however, the cation distribution differed and depended on the calcination temperature. Heating at 500 °C led to the formation of an inhomogeneous (Co,Al)3O4 solid solution; further treatment at 850 °C provoked the partial decomposition of mixed Co-Al oxides and the formation of particles with an Al-depleted interior and Al-enriched surface. It has been shown that the reduction of cobalt oxide by hydrogen occurs via the following transformations: (Co,Al)3O4 → (Co,Al)O → Co. Depending on the Al distribution, the course of reduction changes. In the case of the inhomogeneous (Co,Al)3O4 solid solution, Al stabilizes intermediate Co(II)-Al(III) oxides during reduction. When Al3+ ions are predominantly on the surface of the Co3O4 particles, the intermediate compound consists of Al-depleted and Al-enriched Co(II)-Al(III) oxides, which are reduced independently. Different distributions of elemental Co and Al in mixed oxides simulate different types of the interaction phase in Co3O4/γ-Al2O3-supported catalysts. These changes in the reduction properties can significantly affect the state of an active component of the Co-based catalysts.

AB - The reduction of Co-based oxides doped with Al3+ ions has been studied using in situ XRD and TPR techniques. Al3+-modified Co3O4 oxides with the Al mole fraction Al/(Co + Al) = 1/6; 1/7.5 were prepared via coprecipitation, with further calcination at 500 and 850 °C. Using XRD and HAADF-STEM combined with EDS element mapping, the Al3+ cations were dissolved in the Co3O4 lattice; however, the cation distribution differed and depended on the calcination temperature. Heating at 500 °C led to the formation of an inhomogeneous (Co,Al)3O4 solid solution; further treatment at 850 °C provoked the partial decomposition of mixed Co-Al oxides and the formation of particles with an Al-depleted interior and Al-enriched surface. It has been shown that the reduction of cobalt oxide by hydrogen occurs via the following transformations: (Co,Al)3O4 → (Co,Al)O → Co. Depending on the Al distribution, the course of reduction changes. In the case of the inhomogeneous (Co,Al)3O4 solid solution, Al stabilizes intermediate Co(II)-Al(III) oxides during reduction. When Al3+ ions are predominantly on the surface of the Co3O4 particles, the intermediate compound consists of Al-depleted and Al-enriched Co(II)-Al(III) oxides, which are reduced independently. Different distributions of elemental Co and Al in mixed oxides simulate different types of the interaction phase in Co3O4/γ-Al2O3-supported catalysts. These changes in the reduction properties can significantly affect the state of an active component of the Co-based catalysts.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85172862135&origin=inward&txGid=0e68ebb8e7e886068fe9c68aa945eb40

UR - https://www.mendeley.com/catalogue/9c20d282-beef-3022-8b20-7571ecbc3e72/

U2 - 10.3390/ma16186216

DO - 10.3390/ma16186216

M3 - Article

C2 - 37763493

VL - 16

JO - Materials

JF - Materials

SN - 1996-1944

IS - 18

M1 - 6216

ER -

ID: 56248254