Washcoated open-cell foam cobalt spinel catalysts for N2O decomposition

Klegová, Anna; Pacultová, Kateřina; Kiška, Tomáš; Peikertová, Pavlína; Rokicińska, Anna; Kuśtrowski, Piotr; Obalová, Lucie

doi:10.1016/j.mcat.2022.112754

Cited by 7 publications

(4 citation statements)

References 66 publications

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“…15,16 We have previously published (i) a comparison of different deposition methods of Co 3 O 4 and Co 4 MnAlO x active phase on the SiC foam, 15 (ii) the effect of the ceramic foam composition on the activity of Cs/Co 3 O 4 for N 2 O decomposition, 16 and (iii) the effect of the washcoat on the activity of Cs/Co 3 O 4 for N 2 O decomposition. 17 It was found that for Cs/Co 3 O 4 samples regardless of washcoat or support material used, the best activity was achieved for the sample with the highest Co 3+ /Co 2+ molar ratio corresponding to the optimal Cs/Co molar ratio. Differences in the Cs/Co ratio were obtained as a result of a different level of cobalt oxide aggregation and different levels of cesium dispersion.…”

Section: Introductionmentioning

confidence: 93%

“…Elimination of nitrous oxide (N 2 O), a strong greenhouse gas with high global warming potential and dominant stratospheric-ozone-depleting substance, represents a goal of many researchers from both environmental and economic points of view. , High catalytic activity was observed over alkali metals modified Co 3 O 4 even in the presence of oxygen, water vapor, and NO x . − − However, the formation of Co 3 O 4 into tablets leads to a catalyst with low mechanical strength and ineffective utilization of cobalt due to mass transfer limitations in the pellets . Therefore, different supports were studied as carriers of cobalt mixed oxide catalysts: monoliths, , sieves , tablets, and foams. , We have previously published (i) a comparison of different deposition methods of Co 3 O 4 and Co 4 MnAlO x active phase on the SiC foam, (ii) the effect of the ceramic foam composition on the activity of Cs/Co 3 O 4 for N 2 O decomposition, and (iii) the effect of the washcoat on the activity of Cs/Co 3 O 4 for N 2 O decomposition . It was found that for Cs/Co 3 O 4 samples regardless of washcoat or support material used, the best activity was achieved for the sample with the highest Co 3+ /Co 2+ molar ratio corresponding to the optimal Cs/Co molar ratio.…”

Section: Introductionmentioning

confidence: 99%

“…The current article is a follow-up to an earlier study of cobalt-based catalysts deposited on open-cell ceramic foams for the decomposition of N 2 O. − Optimization of the active phase loading is presented in the current work. Co 3 O 4 with 1 wt % of Cs promoter deposited on the α-Al 2 O 3 -based ceramic foam was used as the active phase in all cases.…”

Section: Introductionmentioning

confidence: 99%

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How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition

Klegová

Pacultová

Kiška

et al. 2023

Ind. Eng. Chem. Res.

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Co3O4 modified with Cs was deposited on an α-Al2O3 open-cell foam, characterized by X-ray diffraction (XRD), N2 physisorption, temperature-programmed reduction by hydrogen (TPR-H2), and scanning electron microscopy-energy-dispersive X-ray analysis (SEM-EDAX) and tested for the low-temperature decomposition of N2O. The aim was to study the effect of the amount of active phase on N2O conversion. Three different approaches were used: (i) the application of foam supports with different cell sizes, (ii) influencing catalyst loading using impregnation solutions with different precursor concentrations, and (iii) deposition of the active phase precursor by repeated immersion–calcination cycles. Increasing the geometric surface area of the support, and thus catalyst loading, was successfully done using the support with higher pore densities. A higher loading was also achieved by increasing the nitrate precursor concentration in the impregnation solution. In both cases, the catalyst activity increased with an increase in the amount of the active phase. Compared to that, a repeated impregnation procedure can ensure the deposition of a higher amount of active phase in comparison to that obtained with one-step impregnation, but only the last layer is used in the reaction and the rest of the active phase remains unutilized, which makes this type of preparation unfavorable. The high catalytic activity was preserved at 450 °C even in the presence of O2, H2O, and NO.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition

Klegová

Pacultová

Kiška

et al. 2023

Ind. Eng. Chem. Res.

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“…They can also be employed as filters for hightemperature gas and fluids [4]. Magnetite wash-coated metal foams were found to be an effective cathode for electro-Fenton systems for removing dyes in wastewater [5][6][7] because when employed as conducting and porous catalyst supports, they maximize the reaction efficiency by increasing the exposed surface area of the cathode and minimize mass transport limitations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Fluid Flow through Zinc Open-Cell Foams Produced by the Excess Salt Replication Process and Suitable as a Catalyst in Wastewater Treatment

Hassein-Bey

Belhadj

Tahraoui

et al. 2023

Water

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The “excess salt replication process” is a new simple method of fabrication of open-cell metal foam based on the commonly known salt replication method. Porous materials with porosity between 46% and 66% result when the employed alloy is 25% antimonial lead alloy and when it is 58% to 65% zamak 5. These foams are proposed as structured catalysts instead of packed beds in the treatment of wastewater. The local regimes influencing macroscopic air flow behaviour through these foams are delimited and boundaries are analysed in terms of sample length. Most of the experimental tests in this work exhibited a general trend of air flow in ESR foams dominated by the “strong inertia regime”. It was established that the law governing the unidirectional air flow through these foams was the full cubic law. The permeability and inertia coefficient of five samples with a cell diameter between 2.5 and 4.5 mm were calculated, and an empirical correlation was fitted. The irregular cuboid shape of salt grains used in the ESR foam was the origin of the special cell form of ESR foams leading to an anisotropic ordered porous media. This can explain the macroscopic turbulence of air flow because there were many dead zones present in the corner of each cubic cell, thus causing kinetic energy loss starting at earlier regimes.

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On the optimal Cs/Co ratio responsible for the N2O decomposition activity of the foam supported cobalt oxide catalysts

Klegova,

Pacultová,

Kiška

et al. 2023

Arabian Journal of Chemistry

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Washcoated open-cell foam cobalt spinel catalysts for N2O decomposition

Cited by 7 publications

References 66 publications

How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition

How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition

Experimental Investigation of Fluid Flow through Zinc Open-Cell Foams Produced by the Excess Salt Replication Process and Suitable as a Catalyst in Wastewater Treatment

On the optimal Cs/Co ratio responsible for the N2O decomposition activity of the foam supported cobalt oxide catalysts

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Washcoated open-cell foam cobalt spinel catalysts for N2O decomposition

Cited by 7 publications

References 66 publications

How Loading of Co3O4-Cs on an Open-Cell Foam Influences N2O Decomposition

How Loading of Co3O4-Cs on an Open-Cell Foam Influences N2O Decomposition

Experimental Investigation of Fluid Flow through Zinc Open-Cell Foams Produced by the Excess Salt Replication Process and Suitable as a Catalyst in Wastewater Treatment

On the optimal Cs/Co ratio responsible for the N2O decomposition activity of the foam supported cobalt oxide catalysts

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How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition

How Loading of Co₃O₄-Cs on an Open-Cell Foam Influences N₂O Decomposition