Cobalt mixed oxides deposited on the SiC open-cell foams for nitrous oxide decomposition

Klegová, Anna; Inayat, Amer; Indyka, Paulina; Gryboś, Joanna; Sojka, Zbigniew; Pacultová, Kateřina; Schwieger, Wilhelm; Volodarskaja, Anastasia; Kuśtrowski, Piotr; Rokicińska, Anna; Fridrichová, Dagmar; Obalová, Lucie

doi:10.1016/j.apcatb.2019.117745

Cited by 33 publications

(19 citation statements)

References 64 publications

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“…The highresolution XPS spectra recorded in the Co 2p region (Figure 6a,b) display a characteristic doublet of the Co 2p3/2 and Co 2p1/2 peaks, which is related to the spin-orbital splitting. The determined distance between the peaks in this doublet for all studied materials is Δ = 15.3-15.4 eV, which is the typical value reported for the Co3O4 phase in the literature [36,37]. The surface composition of the Co-loaded materials synthesized in the paths A and B was more precisely characterized by X-ray photoelectron spectroscopy (XPS).…”

Section: Resultsmentioning

confidence: 58%

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

et al. 2021

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Bearing in mind the need to develop optimal transition metal oxide-based catalysts for the combustion of volatile organic compounds (VOCs), yolk-shell materials were proposed. The constructed composites contained catalytically active Co3O4 nanoparticles, protected against aggregation and highly dispersed in a shell made of porous SiO2, forming a specific type of nanoreactor. The bottom-up synthesis started with obtaining spherical poly(styrene-co-acrylic acid) copolymer (PS30) cores, which were then covered with the SiO2 layer. The Co3O4 active phase was deposited by impregnation using the PS30@SiO2 composite as well as hollow SiO2 spheres with the removed copolymer core. Structure (XRD), morphology (SEM), chemical composition (XRF), state of the active phase (UV-Vis-DR and XPS) and reducibility (H2-TPR) of the obtained catalysts were studied. It was proven that the introduction of Co3O4 nanoparticles into the empty SiO2 spheres resulted in their loose distribution, which facilitated the access of reagents to active sites and, on the other hand, promoted the involvement of lattice oxygen in the catalytic process. As a result, the catalysts obtained in this way showed a very high activity in the combustion of toluene, which significantly exceeded that achieved over a standard silica gel supported Co3O4 catalyst.

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Section: Resultsmentioning

confidence: 58%

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

et al. 2021

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“…The reason is that most researchers have done their studies using one form of support rather than using different carriers for a desired reaction [8][9][10][11]. Perhaps, because the commercial catalyst (iridium on gamma-alumina) for hydrazine decomposition has a spherical form [12][13][14], less has been paid to various forms of catalyst support in the present papers, but in the species such as hydrogen peroxides, there are some reports about the influence of the shape of catalyst support on the decomposition rate [15][16][17].…”

Section: Introductionmentioning

confidence: 93%

Development of novel supported iridium nanocatalysts for special catalytic beds

et al. 2019

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In the present paper, an experimental study of the catalytic decomposition of hydrous hydrazine was investigated on the different structural forms of the catalyst. The synthesized iridium catalysts have been usually used directly and have not been evaluated in the laboratory reactor. This study includes the preparation of iridium-based catalysts supported on spherical (alumina), honeycomb monoliths (cordierite) and foams (alumina) for the evaluation of catalytic activity in the laboratory reactor. The characterizations of these catalysts were evaluated by the TGA, FESEM and BET analysis. The result of the catalytic characterization of monolithic support was shown a homogeneous distribution of active metal without any problem of sintering (average size 25 nm) on the support surface. While the surface of the spherical and foam supports were shown non-uniform distribution of nanoparticles on the support skeleton (average size 55 nm). The monolithic catalyst exhibits higher decomposition rate and H 2 selectivity than other supports due to uniform in shape and particle size distribution.

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“…This trend is also observed in the work by Stelmachowski et al 69 where precipitation, hydrothermal, and supercritical water syntheses were compared. Klegova et al 70 demonstrated that Co 3 O 4 and Co 4 MnAlO x supported on SiC open‐cell foams prepared by a suspension method are significantly more active than those prepared from solutions by the impregnation method. The use of freeze‐drying after impregnation during FeZSM‐5 catalyst synthesis, 71 allows one to obtain an enhanced metal‐support interaction and higher catalytic activity in comparison with a traditional drying method.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

et al. 2020

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Lanthanum orthoferrite powders were synthesized via one-step hydrothermal reactions under mild conditions using microwave and conventional heating. The use of microwave irradiation during the synthesis allows one to obtain nanocrystalline LaFeO 3 with a higher yield and reduced crystallite and particle size within a 16 times shorter duration (3 hours) at a lower temperature of 220°C as compared to the conventional heating. The catalytic decomposition of nitrous oxide was performed over both samples, it was shown that the sample obtained under microwave conditions demonstrates enhanced activity as a catalyst: N 2 O decomposes completely at 700°C over the catalyst formed at microwave conditions, while the comparative catalyst prepared by conventional heating reaches a lower conversion of only 60% at the same temperature and catalytic reaction conditions.

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Cobalt mixed oxides deposited on the SiC open-cell foams for nitrous oxide decomposition

Cited by 33 publications

References 64 publications

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

Development of novel supported iridium nanocatalysts for special catalytic beds

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

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Cobalt mixed oxides deposited on the SiC open-cell foams for nitrous oxide decomposition

Cited by 33 publications

References 64 publications

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

Design of Co3O4@SiO2 Nanorattles for Catalytic Toluene Combustion Based on Bottom-Up Strategy Involving Spherical Poly(styrene-co-acrylic Acid) Template

Development of novel supported iridium nanocatalysts for special catalytic beds

Hydrothermal microwave‐assisted synthesis of LaFeO3 catalyst for N2O decomposition

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Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition