A high-efficiency γ-MnO<sub>2</sub>-like catalyst in toluene combustion

Si, Wenzhe; Wang, Yu; Peng, Yue; Li, Xiang; Li, Kezhi; Li, Junhua

doi:10.1039/c5cc04528b

Cited by 163 publications

(91 citation statements)

References 24 publications

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“…In Figure 2B, O 1s has signals at BE values of 529.9 and 531.6 eV, which correspond to surface lattice oxygen (O latt ) and surface adsorbed oxygen (O ads ), respectively. 51,52 The dominant source of O ads is originate from the As(III) and As(V), which exists as H 3 AsO 3 and H 2 AsO 4 − under the experiment condition (pH 6). And the O latt is belonging to the ZCNs itself, and it will remains invariant during the adsorption process.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Luo

et al. 2016

ACS Appl. Mater. Interfaces

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To use zirconia (ZrO 2 ) as an efficient environmental adsorbent, it can be impregnated on a support to improve its physical properties and lower the overall cost. In this study, ZrO 2 embedded in carbon nanowires (ZCNs) is fabricated via an electrospinning method to remove arsenic (As) from water. The maximum adsorption capacity values of As(III) and As(V) on the ZCNs are 28.61 and 106.57 mg/g, respectively, at 40°C. These capacities are considerably higher than those of pure ZrO 2 (2.56 and 3.65 mg/g for As(III) and As(V), respectively) created using the same procedure as for the ZCNs. Meanwhile, the adsorption behaviors of As(III) and As(V) on the ZCNs are endothermic and pH dependent and follow the Freundlich isotherm model and pseudo-first-order kinetic model. Both As(III) and As(V) are chemisorbed onto the ZCNs, which is confirmed by a partial density of state (PDOS) analysis and Dubinin−Radushkevich (D-R) model calculations. Furthermore, the ZCNs also possess the capability to enhance or catalyze the oxidation process of As(III) to As(V) using dissolved oxygen. This result is confirmed by a batch experiment, XPS analysis and Mulliken net charge analysis. Density functional theory (DFT) calculations indicate the different configurations of As(III) and As(V) complexes on the tetragonal ZrO 2 (t-ZrO 2 )(111) and monoclinic ZrO 2 (m-ZrO 2 )(111) planes, respectively. The adsorption energy (E ad ) of As(V) is higher than that of As(III) on both the tZrO 2 (111) and m-ZrO 2 (111) planes (3.38 and 1.90 eV, respectively, for As(V) and 0.37 and 0.12 eV, respectively, for As(III)).

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Section: ■ Results and Discussionmentioning

confidence: 99%

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Luo

et al. 2016

ACS Appl. Mater. Interfaces

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“…As shown in Figure 5, two peaks centered at 300 and 550 8Cc ould be observed for Mn-MIL-100, and the reduction processt ook place in two steps. The reduction peaks at 300 and 550 8Cw ere attributed to the reductiono fM n 4 + to Mn 3 + and reduction of Mn 3 + to Mn 2 + , [29,30] respectively.O ni ncreasing the calcination temperature to 250 8C, both reduction peaks shifted to lower temperature. Moreover,t he reducibility of amorphous materials followed the trend a-Mn-250 > a-Mn-200 > Mn-MIL-100, which indicated that a-Mn-250 catalysth as stronger low-temperature reducibility and higher mobility of oxygen specieso r oxygen vacancies.…”

Section: Characterizationo Fa Morphouscatalystsmentioning

confidence: 98%

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

Zhang

et al. 2018

Chemistry A European J

109

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A comprehensive study was carried out on amorphous metal-organic frameworks Mn-MIL-100 as efficient catalysts for CO oxidation. This study focused on explaining the crystalline-amorphous-crystalline transformations during thermolysis of Mn-MIL-100 and studying the structure changes during the CO oxidation reaction. A possible formation mechanism of amorphous Mn-MIL-100 was proposed. Amorphous Mn-MIL-100 obtained by calcination at 250 °C (a-Mn-250) showed a smaller specific surface area (4 m g ) but high catalytic activity. Furthermore, the structure of amorphous Mn-MIL-100 was labile during the reaction. When a-Mn-250 was treated with reaction atmosphere at high temperature (giving used-a-Mn-250-S), the amorphous catalysts transformed into Mn O . Meanwhile, the BET surface area (164 m g ) and catalytic performance both sharply increased. In addition, used-a-Mn-250-S catalyst transformed from Mn O into Mn O , and this resulted in a slight decrease of catalytic activity in the presence of 1 vol % water vapor in the feed stream. A schematic mechanism of the structure changes during the reaction process was proposed. The success of the synthesis relies on the increase in BET surface area by using CO as retreatment atmosphere, and the enhanced catalytic activity was attributed to the unique structure, a large quantity of surface active oxygen species, oxygen vacancies, and good low-temperature reduction behavior.

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“…In a same way, various structures of MnO 2 i.e., α-, β-, δ-MnO 2 were prepared and their catalytic performances in toluene oxidation were assessed to those of a γ-like MnO 2 obtained by the selective removal of La 3+ from an acid-treated three-dimensional macroporous and mesoporous LaMnO 3 [33]. The best performance of this γ-like MnO 2 over the other MnO 2 polymorphs was ascribed both to the open three-dimensional macroporous and mesoporous morphology leading to higher BET surface areas than conventional syntheses, enhanced surface adsorbed oxygen (O ads ) to lattice oxygen (O latt ) molar ratio (O ads /O latt ) and easier reducibility.…”

Section: Mno X In Catalytic Oxidation Of Toluenementioning

confidence: 99%

“…The common oxidation catalytic reactions generally involved three types of mechanism [35]: Langmuir-Hinshelwood, Eley-Rideal and Mars-Van Krevelen (MkV) mechanism [33]. It is well known that MnO x exhibit strong oxygen storage/release ability due to the fact that they easily undergo a rapid reduction-oxidation cycle through the interaction with reducing or oxidant agents accompany by the formation of manganese ions in various oxidation states.…”

Section: Mno X In Catalytic Oxidation Of Toluenementioning

confidence: 99%

The Design of MnOx Based Catalyst in Post-Plasma Catalysis Configuration for Toluene Abatement

Giraudon

Geyter

et al. 2018

Catalysts

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This review provides an overview of our present state of knowledge using manganese oxide (MnOx)-based catalysts for toluene abatement in PPC (Post plasma-catalysis) configuration. The context of this study is concisely sum-up. After briefly screening the main depollution methods, the principles of PPC are exposed based on the coupling of two mature technologies such as NTP (Non thermal plasma) and catalysis. In that respect, the presentation of the abundant manganese oxides will be firstly given. Then in a second step the main features of MnOx allowing better performances in the reactions expected to occur in the abatement of toluene in PPC process are reviewed including ozone decomposition, toluene ozonation, CO oxidation and toluene total oxidation. Finally, in a last part the current status of the applications of PPC using MnOx on toluene abatement are discussed. In a first step, the selected variables of the hybrid process related to the experimental conditions of toluene abatement in air are identified. The selected variables are those expected to play a role in the performances of PPC system towards toluene abatement. Then the descriptors linked to the performances of the hybrid process in terms of efficiency are given and the effects of the variables on the experimental outcomes (descriptors) are discussed. The review would serve as a reference guide for the optimization of the PPC process using MnOx-based oxides for toluene abatement.

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A high-efficiency γ-MnO₂-like catalyst in toluene combustion

Cited by 163 publications

References 24 publications

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

The Design of MnOx Based Catalyst in Post-Plasma Catalysis Configuration for Toluene Abatement

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A high-efficiency γ-MnO2-like catalyst in toluene combustion

Cited by 163 publications

References 24 publications

Zirconia (ZrO2) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO2) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

The Design of MnOx Based Catalyst in Post-Plasma Catalysis Configuration for Toluene Abatement

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A high-efficiency γ-MnO₂-like catalyst in toluene combustion

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies