Structured cobalt oxide catalysts for VOC abatement: the effect of preparation method

Topka, Pavel; Dvořáková, Michaela; Kšírová, Petra; Perekrestov, Roman; Čada, Martin; Balabánová, Jana; Koštejn, Martin; Jirátová, Květa; Kovanda, František

doi:10.1007/s11356-019-06974-2

Cited by 17 publications

(12 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The porosity evaluation was carried out using Kr gas physisorption as shown in the Supporting Information. The observed gas uptake may be linked to the porosity of the coating, the cracks in the film, and gaps possibly formed at the interface of the thermal oxide layer and the substrate [51].…”

Section: Discussionmentioning

confidence: 99%

Unraveling the mechanism of the conversion treatment on Advanced High Strength Stainless Steels (AHSSS)

Nabizadeh

Cherigui²,

Marcoen

et al. 2022

Applied Surface Science

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Unraveling the mechanism of the conversion treatment on Advanced High Strength Stainless Steels (AHSSS)

Nabizadeh

Cherigui²,

Marcoen

et al. 2022

Applied Surface Science

View full text Add to dashboard Cite

“…Therefore, it is imperative to eliminate CO and CH 4 emissions and thus catalytic oxidation converters are needed for their abatement [3]. In contrast to thermal oxidation, catalytic oxidation is considered as green and cost-effective way to reduce the GHG emissions, as it is performed at much lower temperatures, thus being economically favorable and also preventing the formation of nitrous oxides [4].…”

Section: Introductionmentioning

confidence: 99%

Exploring Synthesis Approaches of Co-based Catalysts for the Efficient Oxidation of CH4 and CO

et al. 2022

View full text Add to dashboard Cite

Co-based catalysts were synthesized and studied as novel oxidation catalysts, exploring and optimizing the effect of synthesis method on the redox behavior, the oxygen storage ability and thus the catalytic performance of the derived Co3O4 materials in the complete CH4 and/or CO oxidation reactions. Thus, a series of Co-based catalysts were synthesized applying either the precipitation and/or the hydrothermal method, using different precipitating agents (Na2CO3, NH3, urea or NaOH), Co precursor salt (nitrate or acetate) and finally varying the Co/Na ratio. In addition, the reaction time (6 or 24 h aging) was also investigated for the hydrothermally prepared Co3O4. The best catalysts for the CH4 oxidation are the precipitated Co3O4, using cobalt acetate as precursor salt and NaOH as precipitating agent, presenting the highest surface areas and the lowest Co3O4 particle sizes. On the other side, hydrothermally prepared cobalt oxides reveal higher performance for CO oxidation, with Co3O4 prepared with cobalt acetate, NaOH and low aging time shown as the optimum materials. The best catalysts were further promoted with incorporation of Pd (0.5wt.%) and explored for both reactions. The addition of Pd enhanced the activity of Co3O4 for CH4 oxidation, while Pd did not improve any further the catalyst performance for CO oxidation, presenting thus the same activity with pure cobalt oxides.

show abstract

“…However, Solsona et al have found that the activity in propane oxidation over high surface area bulk Co 3 O 4 was better as compared to Co 3 O 4 -Al 2 O 3 oxides with a high amount of well-dispersed but less reducible Co-Al species [18]. The advantages of thin Co 3 O 4 layers deposited on appropriate supporting material (stainless steel meshes) for VOCs abatement have been also reported [19,20]. The role of the support (CeO 2 , TiO 2 , and Al 2 O 3 ) for complete oxidation of propene over supported Co catalysts was investigated by Wyrwalski et al [21].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically Prepared Co3O4-CeO2 Catalysts for Complete Benzene Oxidation

et al. 2021

View full text Add to dashboard Cite

Considerable efforts to reduce the harmful emissions of volatile organic compounds (VOCs) have been directed towards the development of highly active and economically viable catalytic materials for complete hydrocarbon oxidation. The present study is focused on the complete benzene oxidation as a probe reaction for VOCs abatement over Co3O4-CeO2 mixed oxides (20, 30, and 40 wt.% of ceria) synthesized by the more sustainable, in terms of less waste, less energy and less hazard, mechanochemical mixing of cerium hydroxide and cobalt hydroxycarbonate precursors. The catalysts were characterized by BET, powder XRD, H2-TPR, UV resonance Raman spectroscopy, and XPS techniques. The mixed oxides exhibited superior catalytic activity in comparison with Co3O4, thus, confirming the promotional role of ceria. The close interaction between Co3O4 and CeO2 phases, induced by mechanochemical treatment, led to strained Co3O4 and CeO2 surface structures. The most significant surface defectiveness was attained for 70 wt.% Co3O4-30 wt.% CeO2. A trend of the highest surface amount of Co3+, Ce3+ and adsorbed oxygen species was evidenced for the sample with this optimal composition. The catalyst exhibited the best performance and 100% benzene conversion was reached at 200 °C (relatively low temperature for noble metal-free oxide catalysts). The catalytic activity at 200 °C was stable without any products of incomplete benzene oxidation. The results showed promising catalytic properties for effective VOCs elimination over low-cost Co3O4-CeO2 mixed oxides synthesized by simple and eco-friendly mechanochemical mixing.

show abstract

Structured cobalt oxide catalysts for VOC abatement: the effect of preparation method

Cited by 17 publications

References 34 publications

Unraveling the mechanism of the conversion treatment on Advanced High Strength Stainless Steels (AHSSS)

Unraveling the mechanism of the conversion treatment on Advanced High Strength Stainless Steels (AHSSS)

Exploring Synthesis Approaches of Co-based Catalysts for the Efficient Oxidation of CH4 and CO

Mechanochemically Prepared Co3O4-CeO2 Catalysts for Complete Benzene Oxidation

Contact Info

Product

Resources

About