Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH: The effect of Mn vacancies

Sui, Shanhong; Zhang, Pengyi; Zhang, Huiyu; Cao, Ranran

doi:10.1016/s1872-2067(19)63415-7

Cited by 28 publications

(5 citation statements)

References 54 publications

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“…As for hexanal oxidation, it was preferentially oxidized to hexanoic acid (15), which was decarboxylated to produce CO 2 and aldehyde. After that, the aldehyde was further oxidized to pentanoic acid (14) until it was progressively oxidized to CO 2 and H 2 O . However, the detailed reaction pathways still remain to be further explored.…”

Section: Resultsmentioning

confidence: 99%

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Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Feng

Wang

et al. 2022

Environ. Sci. Technol.

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The volatile organic compounds (VOCs) from cooking oil fumes are very complex and do harm to humans and the environment. Herein, we develop the high-efficiency and energy-saving synergistic photothermocatalytic oxidation approach to eliminate the mixture of heptane and hexanal, the representative VOCs with high concentrations in cooking oil fumes. The Pt/ CeO 2 /TiO 2 catalyst with nanosized Pt particles was prepared by the simple hydrothermal and impregnation methods, and the physicochemical properties of the catalyst were measured using numerous techniques. The Pt/CeO 2 /TiO 2 catalyst eliminated the VOC mixture at low light intensity (100 mW cm −2 ) and low temperature (200 °C). In addition, it showed 25 h of catalytic stability and water resistance (water concentration up to 20 vol %) at 140 or 190 °C. It is concluded that O 2 picked up the electrons from Pt to generate the • O 2 − species, which were transformed to the O 2 2− and O − species after the rise in temperature. In the presence of water, the • OH species induced by light irradiation on the catalyst surface and the • OOH species formed via the thermal reaction were both supplementary oxygen species for VOC oxidation. The synergistic interaction of photo-and thermocatalysis was generated by the reactive oxygen species.

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Section: Resultsmentioning

confidence: 99%

“…After that, the aldehyde was further oxidized to pentanoic acid (14) until it was progressively oxidized to CO 2 and H 2 O. 48 However, the detailed reaction pathways still remain to be further explored. In summary, the Pt/CeO 2 /TiO 2 catalyst with high activity, stability, and water resistance was prepared.…”

Section: Redox Property and Surfacementioning

confidence: 99%

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Feng

Wang

et al. 2022

Environ. Sci. Technol.

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“…The AOS of surface Mn could be calculated by using the equation of AOS = 8.956 − 1.126 × ΔE, in which ΔE represents the splitting width of Mn 3s. [43,44] The corresponding AOS of surface Mn are determined to be 3.77, 3.48, and 3.35 for Nanorod, Nanorod-OD, and Nanosheet-OD, respectively (Figure 2c). A lower AOS suggests the higher concentration of Mn 3+ .…”

Section: Physical and Chemical Characterization Of β-Mnomentioning

confidence: 99%

Oxygen Defect Engineering of β‐MnO₂ Catalysts via Phase Transformation for Selective Catalytic Reduction of NO

Yang¹,

Peng²,

Lan

et al. 2021

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The catalysts for low‐temperature selective catalytic reduction of NO with NH3 (NH3‐SCR) are highly desired due to the large demand in industrial furnaces. The characteristic of low‐temperature requires the catalyst with rich active sites especially the redox sites. Herein, the authors obtain oxygen defect‐rich β‐MnO2 from a crystal phase transformation process during air calcination, by which the as‐prepared γ‐MnO2 nanosheet and nanorod can be conformally transformed into the corresponding β‐MnO2. Simultaneously, this transformation accompanies oxygen defects modulation resulted from lattice rearrangement. The most active β‐MnO2 nanosheet with plentiful oxygen defects shows a high efficiency of > 90% NO conversion in an extremely wide operation window of ≈120–350 °C. The detailed characterizations and density functional theory (DFT) calculations reveal that the introduction of oxygen defects enhances the adsorption properties for reactants and decreases the energy barriers of *NH2 formation more than 0.3 eV (≈0.32–0.37 eV), which contributes to a high efficiency of low‐temperature SCR activity. The authors finding provides a feasible approach to achieve the oxygen defect engineering and gains insight into manganese‐based catalysts for low‐temperature NO removal or pre‐oxidation.

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“…11,26 Furthermore, many research works demonstrated that structural defects commonly act as adsorption sites and that active sites of MnO x contributed to its first-rate oxidation activity. [12][13][14]43 For example, the promoting effect of Mn vacancies over MnOOH catalyst toward hexanal has been demonstrated by the Zhang group. 12 Besides, our last work found that amorphous MnO x presented higher catalytic combustion activity among a series of MnO x catalysts with different crystallinities due to their defect-rich structures; meanwhile, they can remain stable up to nearly 200 °C.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14]43 For example, the promoting effect of Mn vacancies over MnOOH catalyst toward hexanal has been demonstrated by the Zhang group. 12 Besides, our last work found that amorphous MnO x presented higher catalytic combustion activity among a series of MnO x catalysts with different crystallinities due to their defect-rich structures; meanwhile, they can remain stable up to nearly 200 °C. 13 However, the catalytic combustion reaction is an exothermic process, and the catalyst bed temperature will increase to high temperature (≥400 °C) sometimes when the concentration of VOCs increases or the reaction temperature is adjusted in experiments, which requires a catalyst with good thermal tolerance.…”

Section: Introductionmentioning

confidence: 99%

Outstanding Stability and Enhanced Catalytic Activity for Toluene Oxidation by Si–O–Mn Interaction over MnO_x/SiO₂

Zhang

Zhou

Miao

et al. 2022

Ind. Eng. Chem. Res.

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Emissions of volatile organic compounds (VOCs) have caused serious damage to the environment and public health. Catalytic combustion is an efficient technology for VOC elimination. In this study, porous silica supported amorphous MnO x was constructed. It presented excellent stability and high activity for toluene combustion, even under the high humidity (T 90 = 218 °C). Compared with bulk amorphous MnO x , the catalytic activity has been improved by more than 11 times. The various characterizations and quantum chemical calculation results suggested that the Si−O−Mn hybridization induced weakening of the Mn−O bond strength and electron transfer from the catalyst to surface oxygen species. A promoting effect of the Si−O−Mn interaction on the spillover of active O species was proposed which enhanced the catalytic activity. In-situ DRIFTS and XPS analytical results determined the reaction mechanism and revealed that both O latt and O surf participate in the catalytic oxidation of toluene . The problem of the poor thermal stability of amorphous MnO x has been solved in this work. This work provides a convenient and effective method to prepare efficient catalysts with high activity and good thermal stability for VOC catalytic combustion.

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Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH: The effect of Mn vacancies

Cited by 28 publications

References 54 publications

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Oxygen Defect Engineering of β‐MnO₂ Catalysts via Phase Transformation for Selective Catalytic Reduction of NO

Outstanding Stability and Enhanced Catalytic Activity for Toluene Oxidation by Si–O–Mn Interaction over MnO_x/SiO₂

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Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH: The effect of Mn vacancies

Cited by 28 publications

References 54 publications

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO2/TiO2

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO2/TiO2

Oxygen Defect Engineering of β‐MnO2 Catalysts via Phase Transformation for Selective Catalytic Reduction of NO

Outstanding Stability and Enhanced Catalytic Activity for Toluene Oxidation by Si–O–Mn Interaction over MnOx/SiO2

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Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Oxygen Defect Engineering of β‐MnO₂ Catalysts via Phase Transformation for Selective Catalytic Reduction of NO

Outstanding Stability and Enhanced Catalytic Activity for Toluene Oxidation by Si–O–Mn Interaction over MnO_x/SiO₂