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

Pacultová, Kateřina; Klegová, Anna; Kiška, Tomáš; Fridrichová, Dagmar; Martaus, Alexandr; Rokicińska, Anna; Kuśtrowski, Piotr; Obalová, Lucie

doi:10.1016/j.materresbull.2020.110892

Cited by 20 publications

(16 citation statements)

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“…Relevant studies have shown that the appropriate alkali metal could significantly improve the electron transfer property of catalysts and enhance the catalytic decomposition activity of N 2 O. − By the addition of potassium (K), a basic source, the electronic structure of Mn x Co 1– x Co 2 O 4 spinel structure catalysts’ surface was optimized by Abu-Zied and co-workers, which consequently enhanced the catalytic decomposition performance of N 2 O . Franken et al found that a small amount of K could stabilize the active sites and fine-tune the redox ability of the Cu 0.25 Co 2.75 O 4 catalyst .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

Zhao

Wang

et al. 2022

Ind. Eng. Chem. Res.

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In this work, a series of cesium (Cs) modified metal oxide (Co3O4, CuO, Mn2O3, and NiO) catalysts were synthesized and investigated for N2O catalytic decomposition. More than 95% N2O conversion was obtained with the Cs-supported Co3O4 (Cs/Co) catalyst at 300 °C, but only a slight increase or even suppression was obtained with the other catalysts. The activation energy (E a) varied significantly for Cs modified catalysts. It was found that both of N2O adsorption–dissociation (from N2O-TPD) and O2 desorption capacities (from O2-TPD) were highly correlated with the N2O decomposition activity. Highly optimized N2O activation and O2 desorption capacities contributed to the boosting performance of the Cs/Co catalyst. Moreover, the improved electron transfer property inferred from H2-temperature-programmed reduction and X-ray photoelectron spectroscopy was likely to facilitate the reaction processes and promote N2O catalytic decomposition performance.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

Zhao

Wang

et al. 2022

Ind. Eng. Chem. Res.

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“…Again, however, this catalyst had a significantly higher Co content (25 wt.%) [51]. Cobalt catalysts on beta zeolite (2 wt.% of Co) showed slightly better results under similar conditions, which is due to the better distribution of Co on the surface, as these catalysts have 4 to 6 times higher specific surface area (500-750 m 2 /g) [52].…”

Section: N 2 O Catalytic Decompositionmentioning

confidence: 88%

“…It is achieved by applying a thin active layer to the support material. Supported cobalt oxide N 2 O catalysts were studied mainly on different monoliths [46][47][48][49], sieves [32,50], tablets, pellets or extrudates [29,51] and ceramic foams [52].…”

Section: Introductionmentioning

confidence: 99%

Cobalt Based Catalysts on Alkali-Activated Zeolite Foams for N2O Decomposition

et al. 2020

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In this work, we studied the effect of alkali-activated zeolite foams modifications on properties and catalytic activity of cobalt phases in the process of catalytic decomposition of N2O. The zeolite foam supports were prepared by alkali activation of natural zeolite followed by acid leaching and ion exchange. The cobalt catalysts were synthesised by a different deposition technique (direct ion exchange (DIE) and incipient wetness impregnation (IWI) method of cobalt on zeolite foams. For comparison, catalysts on selected supports were prepared and the properties of all were compared in catalytic tests in the pellet form and as crushed catalysts to determine the effect of internal diffusion. The catalysts and supports were in detail characterized by a variety of techniques. The catalyst activity strongly depended on the structure of support and synthesis procedure of a cobalt catalyst. Ion exchange method provided active phase with higher surface areas and sites with better reducibility, both of these factors contributed to higher N2O conversions of more than 80% at 450 °C. A large influence can also be attributed to the presence of alkali metals, in particular, potassium, which resulted in a modification of electronic and acid base properties of the cobalt oxide phase on the catalyst surface. The promotional effect of potassium is better reducibility of cobalt species.

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“…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%

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

Cited by 20 publications

References 50 publications

Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

Cobalt Based Catalysts on Alkali-Activated Zeolite Foams for N2O Decomposition

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

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

Cited by 20 publications

References 50 publications

Enhancement of Cs on Co3O4 for N2O Catalytic Decomposition: N2O Activation and O2 Desorption

Enhancement of Cs on Co3O4 for N2O Catalytic Decomposition: N2O Activation and O2 Desorption

Cobalt Based Catalysts on Alkali-Activated Zeolite Foams for N2O Decomposition

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

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Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

Enhancement of Cs on Co₃O₄ for N₂O Catalytic Decomposition: N₂O Activation and O₂ Desorption

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