Highly efficient mesoporous MnO2 catalysts for the total toluene oxidation: Oxygen-Vacancy defect engineering and involved intermediates using in situ DRIFTS

Mo, Shengpeng; Zhang, Qi; Li, Jiaqi; Sun, Yuhai; Ren, Quanming; Zou, Sibei; Zhang, Qian; Lu, Jiong; Fu, Mingli; Mo, Dang; Wu, Junliang; Huang, Haomin; Ye, Daiqi

doi:10.1016/j.apcatb.2019.118464

Cited by 610 publications

(299 citation statements)

References 61 publications

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“…Based on the in situ DRIFTS characterization, we can speculate the possible reaction path over α-MnO2@Co3O4, as follows [63,64]: adsorbed toluene → benzoate species → alkanes containing oxygen functional group (such as maleic anhydride) → CO2 and H2O. Moreover, it was observed that toluene can be more easily completely oxidized over α-MnO2@Co3O4 than over the pure α-MnO2 catalyst at the same temperature, which is consistent with the results of the catalytic activity tests for toluene oxidation.…”

Section: In Situ Drifts Analysismentioning

confidence: 99%

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Ren

Fan

et al. 2020

Chinese Journal of Catalysis

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Herein, a bottom-down design is presented to successfully fabricate ZIF-derived Co3O4, grown in situ on a one-dimensional (1D) α-MnO2 material, denoted as α-MnO2@Co3O4. The synergistic effect derived from the coupled interface constructed between α-MnO2 and Co3O4 is responsible for the enhanced catalytic activity. The resultant α-MnO2@Co3O4 catalyst exhibits excellent catalytic activity at a T90% (temperature required to achieve a toluene conversion of 90%) of approximately 229 o C, which is 47 and 28 °C lower than those of the pure α-MnO2 nanowire and Co3O4-b obtained via pyrolysis of ZIF-67, respectively. This activity is attributed to the increase in the number of surface-adsorbed oxygen species, which accelerate the oxygen mobility and enhance the redox pairs of Mn 4+ /Mn 3+ and Co 2+ /Co 3+ . Moreover, the result of in situ diffuse reflectance infrared Fourier transform spectroscopy suggests that the gaseous oxygen could be more easily activated to adsorbed oxygen species on the surface of α-MnO2@Co3O4 than on that of α-MnO2. The catalytic reaction route of toluene oxidation over the α-MnO2@Co3O4 catalyst is as follows: toluene → benzoate species → alkanes containing oxygen functional group → CO2 and H2O. In addition, the α-MnO2@Co3O4 catalyst shows excellent stability and good water resistance for toluene oxidation. Furthermore, the preparation method can be extended to other 1D MnO2 materials. A new strategy for the development of high-performance catalysts of practical significance is provided.

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Section: In Situ Drifts Analysismentioning

confidence: 99%

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Ren

Fan

et al. 2020

Chinese Journal of Catalysis

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“…The O 1s spectrum, in Figure 2D , shows two peaks at 529.8, and 531.5 eV, which are correlated to the normal lattice oxygen (O latt ), and adsorbed oxygen (O abs ), respectively. Since the surface adsorbed oxygen mainly occurs at the oxygen vacancy, the oxygen vacancy content can be known through the analysis of O abs ( Li et al, 2020b ; Mo et al, 2020 ). Through the O 1s spectrum, it can be found that the proportion of O abs increases after the calcination and adsorption-calcination process, indicating that the process can introduce more oxygen vacancies in the MnO 2 structure.…”

Section: Resultsmentioning

confidence: 99%

A Novel Cr2O3/MnO2-x Electrode for Lithium-Oxygen Batteries with Low Charge Voltage and High Energy Efficiency

et al. 2021

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A high energy efficiency, low charging voltage cathode is of great significance for the development of non-aqueous lithium-oxygen batteries. Non-stoichiometric manganese dioxide (MnO2-x) and chromium trioxide (Cr2O3) are known to have good catalytic activities for the discharging and charging processes, respectively. In this work, we prepared a cathode based on Cr2O3 decorated MnO2-x nanosheets via a simple anodic electrodeposition-electrostatic adsorption-calcination process. This combined fabrication process allowed the simultaneous introduction of abundant oxygen vacancies and trivalent manganese into the MnO2-x nanosheets, with a uniform load of a small amount of Cr2O3 on the surface of the MnO2-x nanosheets. Therefore, the Cr2O3/MnO2-x electrode exhibited a high catalytic effect for both discharging and charging, while providing high energy efficiency and low charge voltage. Experimental results show that the as-prepared Cr2O3/MnO2-x cathode could provide a specific capacity of 6,779 mA·h·g−1 with a terminal charge voltage of 3.84 V, and energy efficiency of 78%, at a current density of 200 mA·g−1. The Cr2O3/MnO2-x electrode also showed good rate capability and cycle stability. All the results suggest that the as-prepared Cr2O3/MnO2-x nanosheet electrode has great prospects in non-aqueous lithium-oxygen batteries.

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“…Migration and transformation cycles of the oxygen species during toluene oxidation occur. [ 44 ] The formation of additional surface oxygen vacancies improves oxygen transfer, which directly provides active oxygen species for the reaction, [ 21 ] thereby improving the efficiency toward the catalytic oxidation of toluene. Additionally, oxygen migration promotes additional surface oxygen vacancies during the reaction.…”

Section: Resultsmentioning

confidence: 99%

Nanocage‐Shaped Co₃₋_xZr_xO₄ Solid‐Solution Supports Loaded with Pt Nanoparticles as Effective Catalysts for the Enhancement of Toluene Oxidation

Wang

Chen

et al. 2020

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Nanocage‐shaped Co3−xZrxO4 solid‐solution supports and the corresponding platinum loaded nanocomposites, yPt/Co3−xZrxO4 (x =0.27, 0.50, 0.69; y = 0.5, 1.0, 2.0 wt.%), are successfully fabricated via a Cu2O nanocube hard template method and a glycol reduction method, respectively. The hollow nanocage structures obviously improve surface areas; moreover, the Zr doping forms the Co3−xZrxO4 solid‐solution supports, and the corresponding yPt/Co3−xZrxO4 catalysts promote the enhancement of catalytic performance. Catalytic activity toward toluene combustion is enhanced for the 2.0 wt% Pt/Co2.73Zr0.27O4 catalyst. The catalysts are characterized using multiple techniques. Pt nanoparticles are uniformly dispersed across the Co2.73Zr0.27O4 nanocage surface. The 2.0 wt% Pt/Co2.73Zr0.27O4 catalyst exhibits the highest catalytic activity among all the samples and demonstrates good stability, with 90% toluene conversion obtained at a temperature of 165 °C. The same catalyst accomplishes full toluene oxidation at 180 °C, at a weight hourly space velocity of 36 000 mL h−1 g−1. The apparent activation energy (Ea) over the yPt/Co2.73Zr0.27O4 samples are significantly lower than those over the Co3−xZrxO4 supports, with the 2.0 wt% Pt/Co2.73Zr0.27O4 catalyst exhibiting the lowest Ea value. These findings demonstrate the potential of the 2.0 wt% Pt/Co2.73Zr0.27O4 catalyst as a promising catalyst toward atmospheric toluene removal.

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Highly efficient mesoporous MnO2 catalysts for the total toluene oxidation: Oxygen-Vacancy defect engineering and involved intermediates using in situ DRIFTS

Cited by 610 publications

References 61 publications

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

A Novel Cr2O3/MnO2-x Electrode for Lithium-Oxygen Batteries with Low Charge Voltage and High Energy Efficiency

Nanocage‐Shaped Co₃₋_xZr_xO₄ Solid‐Solution Supports Loaded with Pt Nanoparticles as Effective Catalysts for the Enhancement of Toluene Oxidation

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Highly efficient mesoporous MnO2 catalysts for the total toluene oxidation: Oxygen-Vacancy defect engineering and involved intermediates using in situ DRIFTS

Cited by 610 publications

References 61 publications

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

A Novel Cr2O3/MnO2-x Electrode for Lithium-Oxygen Batteries with Low Charge Voltage and High Energy Efficiency

Nanocage‐Shaped Co3−xZrxO4 Solid‐Solution Supports Loaded with Pt Nanoparticles as Effective Catalysts for the Enhancement of Toluene Oxidation

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Nanocage‐Shaped Co₃₋_xZr_xO₄ Solid‐Solution Supports Loaded with Pt Nanoparticles as Effective Catalysts for the Enhancement of Toluene Oxidation