Effect of Ru on the activity of Co<sub>3</sub>O<sub>4</sub> catalysts for chlorinated aromatics oxidation

Lao, Yijie; Zhu, Naxin; Jiang, Xingxing; Zhao, Jian; Dai, Qiguang; Wang, Xingyi

doi:10.1039/c8cy01484a

Cited by 98 publications

(49 citation statements)

References 70 publications

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“…Co 2p 3/2 and Co 2p 1/2 peaks can be further divided into two sub peaks, which are D 1 (779.7∼780.0 eV), D 2 (781.0∼781.4 eV), D 3 (794.5∼794.6 eV) and D 4 (796.2∼796.4 eV). D 1 and D 3 correspond to octahedral Co 3+ , D 2 and D 4 belong to tetrahedral Co 2+ , which is in accord with the previous report in the literatures [26,50] . The ratios of Co 3+ /Co 2+ were calculated according to the integral area obtained by peak fitting, and the results are recorded in Table 1.…”

Section: Resultssupporting

confidence: 86%

“…Co 3 O 4 based catalysts have excellent performances and have been applied in various fields, such as oxidation‐reduction of NO, [17–18] CO oxidation, [19] H 2 production [20] and catalytic oxidation of VOCs [21–23] . Moreover, Co 3 O 4 based catalysts are also widely used in the field of catalytic combustion of CVOCs, e. g., chlorobenzene, [24–26] due to its low O 2 evaporation enthalpy, good bulk oxygen mobility and rich reactive oxygen species [25] . It was reported that the binding bond energy of V−Cl (V=vacancy) is 121 kJ/mol [27] and that of Co−Cl is 117 kJ/mol, [28] which means it only need a little energy to make the catalytic combustion reaction happen spontaneously.…”

Section: Introductionmentioning

confidence: 99%

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A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

Chen

et al. 2022

ChemistrySelect

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Preparation methods are essential for the synthesis of materials with diverse structures, which may lead to the different physicochemical properties. The activities of catalysts for volatile organic compounds (VOCs) combustion can be improved by optimizing the preparation methods. In this paper, a novel ammonium bicarbonate pyrolysis method is successfully applied to prepare Co3O4 catalyst (Co3O4‐A), which is not only facile in preparation, but also superior to the Co3O4 catalysts prepared by the hydrothermal, sol‐gel, MOFs pyrolysis and carbonate pyrolysis method in the performance of chlorobenzene catalytic oxidation with 90 % conversion and mineralization temperature at 310 and 325 °C, respectively (1000 ppm CB, Air, WHSV=60,000 mL ⋅ g−1 ⋅ h−1). Furthermore, Co3O4‐A catalyst can maintain high catalytic activity for a long time, and has high tolerance to water vapor, which indicates Co3O4‐A catalyst has a good potential application value in catalytic combustion of chlorobenzene.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

Chen

et al. 2022

ChemistrySelect

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“…In the process of o ‐DCB adsorption, a sharp band at 1621 cm −1 is formed, and the intensity increased with time, indicated that the existence of o ‐DCB is the main reason. The wave number of 1461 cm −1 can be attributed to the C=C stretching vibration in the aromatic ring [27] . The weak bands at 1260 and 1125 cm −1 correspond to the plane bending vibration of phenolic compounds, while the adjacent bands which are not obvious at 1032 cm −1 are characterized by C−Cl bond vibration of chlorophenols [28] .…”

Section: Resultsmentioning

confidence: 99%

“…The wave number of 1461 cm À 1 can be attributed to the C=C stretching vibration in the aromatic ring. [27] The weak bands at 1260 and 1125 cm À 1 correspond to the plane bending vibration of phenolic compounds, while the adjacent bands which are not obvious at 1032 cm À 1 are characterized by CÀ Cl bond vibration of chlorophenols. [28] Figure 10b can be more intuitive to see the strip position and change.…”

Section: In-situ Ftir Studies and Reaction Mechanismmentioning

confidence: 99%

A CeCoO_x Core/Nb₂O₅@TiO₂ Double‐Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o‐Dichlorobenzene

Ling

Zhao

et al. 2021

Chemistry A European J

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A series of catalysts with different core-shell structures has been successfully prepared by a hydrothermal method. They consisted of CeCoO x @TiO 2 (single shell), CeCoO x @Nb 2 O 5 (single shell) and CeCoO x @Nb 2 O 5 @TiO 2 (double shell) core-shell nanocages and CeCoO x nanocages, in which CeCoO x was the core and TiO 2 and Nb 2 O 5 were shells. The influence of the core-shell structure on the catalytic performance of o-dichlorobenzene was investigated by activity, water-resistance, and thermal stability tests as well as catalyst characterization. The temperatures corresponding to 90 % conversion of o-dichlorobenzene (T 90 ) of CeCoO x , CeCoO x @TiO 2 , CeCoO x @Nb 2 O 5 , and CeCoO x @Nb 2 O 5 @TiO 2 catalysts were 415, 383, 362 and 367°C, respectively. CeCoO x @Nb 2 O 5 exhibited excellent catalytic activity, mainly owing to the special core-shell structure, large specific surface area, abundant activity of Co 3 + , Ce 3 + , Nb 5 + , strong reducibility, and more active oxygen vacancies. It can be seen that the Nb 2 O 5 coating can greatly improve the catalytic activity of the catalyst. In addition, due to the protective effect of the TiO 2 shell on CeCoO x , CeCoO x @Nb 2 O 5 @TiO 2 catalysts exhibited outstanding thermal and hydrothermal stability for 20 hours. The T 90 of CeCoO x @Nb 2 O 5 @TiO 2 was slightly lower than that of CeCoO x @Nb 2 O 5 , but it had higher stability and hydrothermal stability. Furthermore, possible reaction pathways involving the Mars-van-Krevelen (MvK) and Langmuir-Hinshelwood (LÀ H) models were deduced based on studies of the temperature-programmed desorption of O 2 (O 2 -TPD), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance FTIR spectroscopy (DRIFTS) characterization.

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“…Considering the high price of precious metals, a certain amount of rare earths has been considered to replace precious metals to prevent reducing the catalytic performance, especially at high space velocities. Due to the larger space velocity under actual working conditions, the experimental space velocity has been increased to 30,000 h −1 [3,28].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of Chlorobenzene over Pd-TiO2 /Pd-Ce/TiO2 Catalysts

Liang

Zhu

et al. 2020

Catalysts

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A series of Pd-TiO2/Pd-Ce/TiO2 catalysts were prepared by an equal volume impregnation method. The effects of different Pd loadings on the catalytic activity of chlorobenzene (CB) were investigated, and the results showed that the activity of the 0.2%-0.3% Pd/TiO2 catalyst was optimal. The effect of Ce doping enhanced the catalytic activity of the 0.2% Pd-0.5% Ce/TiO2 catalyst. The characterization of the catalysts using BET, TEM, H2-TPR, and O2-TPD showed that the oxidation capacity was enhanced, and the catalytic oxidation efficiency was improved due to the addition of Ce. Ion chromatography and Gas Chromatography-Mass Spectrometer results showed that small amounts of dichlorobenzene (DCB) and trichlorobenzene (TCB) were formed during the decomposition of CB. The results also indicated that the calcination temperature greatly influenced the catalyst activity and a calcination temperature of 550 °C was the best. The concentration of CB affected its decomposition, but gas hourly space velocity had little effect. H2-TPR indicated strong metal–support interactions and increased dispersion of PdO in the presence of Ce. HRTEM data showed PdO with a characteristic spacing of 0.26 nm in both 0.2% Pd /TiO2 and 0.2% Pd-0.5% Ce/TiO2 catalysts. The average sizes of PdO nanoparticles in the 0.2% Pd/TiO2 and 0.2% Pd-0.5% Ce/TiO2 samples were 5.8 and 4.7 nm, respectively. The PdO particles were also deposited on the support and they were separated from each other in both catalysts.

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Effect of Ru on the activity of Co₃O₄ catalysts for chlorinated aromatics oxidation

Abstract: A Ru/Co3O4 catalyst with Ru–O–Co structure presented highly stable activity and selectivity in 1,2-DCB oxidation.

Cited by 98 publications

References 70 publications

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

A CeCoO_x Core/Nb₂O₅@TiO₂ Double‐Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o‐Dichlorobenzene

Catalytic Oxidation of Chlorobenzene over Pd-TiO2 /Pd-Ce/TiO2 Catalysts

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Effect of Ru on the activity of Co3O4 catalysts for chlorinated aromatics oxidation

Abstract: A Ru/Co3O4 catalyst with Ru–O–Co structure presented highly stable activity and selectivity in 1,2-DCB oxidation.

Cited by 98 publications

References 70 publications

A Facile Method to Synthesize Co3O4 Catalyst for Efficient Chlorobenzene Combustion

A Facile Method to Synthesize Co3O4 Catalyst for Efficient Chlorobenzene Combustion

A CeCoOx Core/Nb2O5@TiO2 Double‐Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o‐Dichlorobenzene

Catalytic Oxidation of Chlorobenzene over Pd-TiO2 /Pd-Ce/TiO2 Catalysts

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Effect of Ru on the activity of Co₃O₄ catalysts for chlorinated aromatics oxidation

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

A CeCoO_x Core/Nb₂O₅@TiO₂ Double‐Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o‐Dichlorobenzene