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 |
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Sprache: | eng |
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•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. |
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ISSN: | 0025-5408 1873-4227 |
DOI: | 10.1016/j.materresbull.2020.110892 |