Effect of support on the catalytic activity of Co3O4-Cs deposited on open-cell ceramic foams for N2O decomposition

[Display omitted] •Co3O4-Cs was deposited on different ceramic open-cell foams based on Al2O3, ZrO2, SiO2, C-graphite.•Type of used support strongly influences the amount and dispersion of the deposited active phase.•Co : Cs molar ratio of atoms, which are in efficient contact, changed after active...

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Veröffentlicht in:Materials research bulletin 2020-09, Vol.129, p.110892, Article 110892
Hauptverfasser: Pacultová, Kateřina, Klegova, Anna, Kiška, Tomáš, Fridrichová, Dagmar, Martaus, Alexandr, Rokicińska, Anna, Kuśtrowski, Piotr, Obalová, Lucie
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Sprache:eng
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Zusammenfassung:[Display omitted] •Co3O4-Cs was deposited on different ceramic open-cell foams based on Al2O3, ZrO2, SiO2, C-graphite.•Type of used support strongly influences the amount and dispersion of the deposited active phase.•Co : Cs molar ratio of atoms, which are in efficient contact, changed after active phase deposition.•Al2O3+SiO2 based foam was the most suitable support for N2O decomposition catalyst, ensuring the highest Cs/Co molar ratio. Cobalt mixed oxide with cesium promoter was deposited on different ceramic open-cell foams (Al2O3 + SiO2, ZrO2 and SiO2 + Al2O3 + C-graphite, Lanik Ltd., Czech Republic) by wet impregnation method. The catalysts were tested for N2O decomposition and characterized by AAS, XRD, TPR-H2, FTIR, Raman, XPS, SEM and nitrogen adsorption. The same impregnation procedure resulted in different amounts of deposited Co3O4-Cs on each support and different dispersion of Co3O4 and Cs on the surface. The Al2O3+SiO2 (Al-Si) based ceramic foam was recognized as the most suitable support. The difference in the catalytic activity of unsupported Co3O4-Cs and Co-Cs/Al-Si could be explained in terms of different dispersion levels of individual components on the support, leading to changes in the Cs/Co surface molar ratio of atoms in close contact and subsequent changes in reducibility. Direct correlation of specific rate constant for N2O decomposition and surface Cs/Co molar ratio was found.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2020.110892