Boosting soot combustion efficiency of Co3O4 nanocrystals via tailoring crystal facets

Zhai, Guangjun; Wang, Jinguo; Chen, Zimei; An, Wei; Men, Yongfeng

doi:10.1016/j.cej.2017.12.141

Cited by 145 publications

(64 citation statements)

References 58 publications

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“…Therefore, the focus in the CRT system for soot elimination is to develop effective catalysts, which can oxidize soot within the temperature range (250–400 °C) of diesel engine exhaust. A large number of catalysts for soot combustion have been reported, such as noble metals, , perovskites, − spinel-type oxides, , hydrotalcites, , alkaline metal oxides, , ceria-based oxides, − and transition metal oxides. − Recently, Fang et al synthesized the perovskite-type La 1– x K x FeO 3‑δ nanotubes, which showed high material utilization efficiency and improved catalytic soot oxidation activity. Hernández et al reported an Ag-modified LaSrAgMn perovskite with promising catalytic soot oxidation performance under low O 2 partial pressure.…”

Section: Introductionmentioning

confidence: 99%

Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Xing

Yang

Cao

et al. 2018

ACS Sustainable Chem. Eng.

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Herein, we synthesized CeO2 nanoparticles-decorated Mn2O3 nanosheets on monolithic Ni foam (Ce/Mn-NF) for catalytic elimination of soot particulates. The macroporous nanostructures created by the Mn2O3 nanosheets improve the soot-catalyst contact efficiency on the external surface of catalysts. The superficial Mn–Ce interaction can produce Mn4+ and oxygen vacancies on the Ce/Mn-NF catalysts through the redox process of Ce4+ + Mn3+ ↔ Mn4+ + Ce3+, simultaneously generating surface active oxygen species. Moreover, our results demonstrate that the surface adsorbed oxygen species induced by the Mn–Ce interaction are more active for catalytic soot oxidation than those on the Mn-NF. Thus, the introduction of the CeO2 nanoparticles to the Mn2O3 nanosheets can significantly improve the catalytic activity for soot combustion. For the Ce/Mn-NF-2, the surface atomic ratio of Ce and Mn is close to 1:1, which will create more Mn–Ce interaction sites to generate active oxygen species compared with other catalysts. Accordingly, it exhibits higher catalytic activity. The tactful design of the MnO x –CeO2 catalysts successfully overcomes the problems of how to construct macroporous nanostructures with mixed metal oxides, and this strategy of material design may be applied in other related catalytic systems.

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Section: Introductionmentioning

confidence: 99%

Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Xing

Yang

Cao

et al. 2018

ACS Sustainable Chem. Eng.

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“…Figure b shows two major peaks located at 795.6 and 780.3 eV, which could be assigned to Co 2p 1/2 and Co 2p 3/2 , , respectively. The two peaks at higher energies (785–793 and 800–810 eV) could be ascribed to satellite peaks .…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure a, a close linear correlation existed between the Co 3+ ratio of catalysts and the catalytic activity, which meant that Co 3+ played an important role in soot combustion. Previous works had reported that Co 3+ was the active site for soot oxidation. ,, However, the question remained, how does Co 3+ promote soot oxidation? A linear relationship between the NO 2 yield and the Co 3+ ratio of catalysts is presented in Figure b, indicating that Co 3+ could improve NO oxidation efficiently.…”

Section: Resultsmentioning

confidence: 99%

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Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts

Zhang

Shan

et al. 2021

J. Phys. Chem. C

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“…44 Zhai et al found the Co 3 O 4 exposed (001) facet contained more Co 3+ cations and excellent redox property, resulting in the best catalytic activities. 45 Sun had reported the performance of K/Co 3 O 4 on the soot oxidation and found that Co 3+ was the active site in soot oxidation. 46 Considering the excellent redox properties of cobalt and well NO x storage and desorption ability of barium, the cobalt and barium were introduced to modify the manganese oxides for soot oxidation.…”

Section: Introductionmentioning

confidence: 99%

Promotion Effects of Barium and Cobalt on Manganese Oxide Catalysts for Soot Oxidation

Wang

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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In this study, the catalytic performance of manganese-based compound catalysts and the influence of the introduction of barium and cobalt on the MnO x catalyst were investigated. Mn-based compound catalysts were synthesized by a simple co-precipitation method while the cobalt was loaded by wet impregnation. The 4% Co/BaMnO x sample exhibited the best catalytic activity and stability in soot oxidation, with a T 50 value of 402 °C in the 1000 ppm NO/10% O2/N2 gas flow. The catalysts were characterized by several analytical techniques such as XRD, BET, SEM, O2-TPD, H2-TPR, and XPS to reveal their physicochemical properties. The phases of catalysts changed and the crystallite sizes and crystallinity decreased after the introduction of barium and cobalt, as confirmed by the XRD, BET, and SEM results. NO-TPO experiments revealed that the loading of barium could increase the NO x storage capacity at low temperatures (200–380 °C) and then desorb NO2 at 380–500 °C, and the additional desorbed NO2 could promote the catalytic activity effectively. The characterization (H2-TPR, O2-TPD, and XPS) results confirmed that the redox properties of the catalyst were improved after the introduction of cobalt, which is a key factor in its excellent catalytic performance for soot combustion. Consequently, the synergistic effects of redox properties and NO x storage and desorption ability are key factors for improving the catalytic activity during soot combustion. This study provided rational insights into the roles of cobalt and barium in the process of soot catalytic oxidation.

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Boosting soot combustion efficiency of Co3O4 nanocrystals via tailoring crystal facets

Cited by 145 publications

References 58 publications

Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts

Promotion Effects of Barium and Cobalt on Manganese Oxide Catalysts for Soot Oxidation

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Boosting soot combustion efficiency of Co3O4 nanocrystals via tailoring crystal facets

Cited by 145 publications

References 58 publications

Decorating CeO2 Nanoparticles on Mn2O3 Nanosheets to Improve Catalytic Soot Combustion

Decorating CeO2 Nanoparticles on Mn2O3 Nanosheets to Improve Catalytic Soot Combustion

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo2O4 Spinel Catalysts

Promotion Effects of Barium and Cobalt on Manganese Oxide Catalysts for Soot Oxidation

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Product

Resources

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Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Decorating CeO₂ Nanoparticles on Mn₂O₃ Nanosheets to Improve Catalytic Soot Combustion

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts