Role of oxygen vacancies and Mn4+/Mn3+ ratio in oxidation and dry reforming over cobalt-manganese spinel oxides

Mitran, Gheorghița; Chen, Shaojiang; Seo, Dong Kyun

doi:10.1016/j.mcat.2019.110704

Cited by 17 publications

(15 citation statements)

References 33 publications

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“…These defect sites on the surface of metal oxides adsorb oxygen from the air and transform it into catalytically active species. Similarly to our results,Mitran et al recently observed that replacing of Co 3+ with Mn 4+ in Co-Mn oxides up to Mn 0.15 Co 2.85 leads to the formation of active sites for ethanol oxidation(Mitran et al, 2020). Interaction of Co 3+ and Mn 4+ with lattice oxygen created oxygen vacancies, which served as catalytically active sites.…”

supporting

confidence: 90%

Hydrothermal Deposition as a Novel Method for the Preparation of Co-Mn Mixed Oxide Catalysts Supported on Stainless Steel Meshes: Application to VOC Oxidation

Topka

Jirátová

Dvořáková

et al. 2021

Preprint

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The aim of this work was to develop a novel method for the preparation of structured Co-Mn mixed oxide catalysts: deposition on stainless steel meshes by hydrothermal synthesis. The use of meshes enabled the deposition of a thin layer of the active phase, which significantly suppressed the influence of internal diffusion. Consequently, the prepared catalysts exhibited from 48 to 114 times higher catalytic activity in ethanol oxidation than the commercial pelleted Co-Mn-Al catalyst. Moreover, we have shown that their catalytic activity correlated with the amount of surface oxygen vacancies determined by XPS. Finally, the outstanding activity of the catalyst with Co:Mn ratio of 0.5 was ascribed to the mutual effect of high number of oxygen vacancies and exceptional redox properties.

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supporting

confidence: 90%

Hydrothermal Deposition as a Novel Method for the Preparation of Co-Mn Mixed Oxide Catalysts Supported on Stainless Steel Meshes: Application to VOC Oxidation

Topka

Jirátová

Dvořáková

et al. 2021

Preprint

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“…In addition, the concentrations of Mn 4+ and O α species of oxidizing catalyst were crucial for the oxidative degradation of VOCs [43,49]. The order of the O β /O α follows in descending order as Mn 4+ /Mn 3+ , which was depicted as TP-Mn2Zr3 > MP-Mn2Zr3 > CP-Mn2Zr3, indicating the concentration of Mn 4+ was positively correlated with the content of oxygen vacancy [40]. In combination with the results of catalytic activity and components of active phase, the improved catalytic activity should be attributed to the promoted effects of the solid solution of Mn x Zr 1−x O 2 .…”

Section: Discussionmentioning

confidence: 96%

“…183 eV), and Mn (ca. 642 eV) (Figure 4a) [30,40]. Figure 4b shows the XPS spectra of Mn 2p; it was integrated into two characteristic peaks by deconvolution.…”

Section: Xps Analysismentioning

confidence: 99%

Optimized Synthesis Routes of MnOx-ZrO2 Hybrid Catalysts for Improved Toluene Combustion

Huang

Liu

et al. 2021

Catalysts

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In this contribution, the three Mn-Zr catalysts with MnxZr1−xO2 hybrid phase were synthesized by two-step precipitation route (TP), conventional coprecipitation method (CP) and ball milling process (MP). The components, textural and redox properties of the Mn-Zr hybrid catalysts were studied via XRD, BET, XPS, HR-TEM, H2-TPR. Regarding the variation of synthesis routes, the TP and CP routes offer a more obvious advantage in the adjustment of the concentration of MnxZr1−xO2 solid solution compared to the MP process, which directly commands the content of Mn4+ and oxygen vacancy and lattice oxygen, and thereby leads to the enhanced mobility of reactive oxygen species and catalytic activity for toluene combustion. Moreover, the TP-Mn2Zr3 catalyst with the enriched exposure content of 51.4% for the defective (111) lattice plane of MnxZr1−xO2 exhibited higher catalytic activity and thermal stability for toluene oxidation than that of the CP-Mn2Zr3 sample with a value of 49.3%. This new observation will provide a new perspective on the design of bimetal catalysts with a higher VOCs combustion abatement.

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“…The H 2 -TPR pro les of 0.2, 0.4, 0.6, and 0.8 samples revealed shift of the lowtemperature maximum reduction to 335°C. Furthermore, the 0.5 catalyst exhibited a shoulder at about 227°C, which was tentatively ascribed to reduction of Co 4+ components(Mitran et al, 2020). Thus, the high catalytic activity of the 0.5 catalyst could be connected with its improved reduction behavior.…”

mentioning

confidence: 84%

Hydrothermal deposition as a novel method for the preparation of Co–Mn mixed oxide catalysts supported on stainless steel meshes: application to VOC oxidation

Topka

Jirátová

Dvořáková

et al. 2021

Environ Sci Pollut Res

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Role of oxygen vacancies and Mn4+/Mn3+ ratio in oxidation and dry reforming over cobalt-manganese spinel oxides

Cited by 17 publications

References 33 publications

Hydrothermal Deposition as a Novel Method for the Preparation of Co-Mn Mixed Oxide Catalysts Supported on Stainless Steel Meshes: Application to VOC Oxidation

Hydrothermal Deposition as a Novel Method for the Preparation of Co-Mn Mixed Oxide Catalysts Supported on Stainless Steel Meshes: Application to VOC Oxidation

Optimized Synthesis Routes of MnOx-ZrO2 Hybrid Catalysts for Improved Toluene Combustion

Hydrothermal deposition as a novel method for the preparation of Co–Mn mixed oxide catalysts supported on stainless steel meshes: application to VOC oxidation

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