Self-assembly of MnO2 nanostructures into high purity three-dimensional framework for high efficiency formaldehyde mineralization

Rong, Shaopeng; He, Taohong; Zhang, Pengyi

doi:10.1016/j.apcatb.2019.118375

Cited by 59 publications

(30 citation statements)

References 47 publications

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“…For transition-metal oxides, such as manganese oxides, defects can be generally classified into oxygen defects and cation/Mn defects. Our previous publications − have confirmed that oxygen defects significantly affect the catalytic performance of manganese oxides. Oxygen defect, as active sites in heterogeneous catalysis, has been extensively studied in various catalytic oxidation reactions.…”

Section: Introductionmentioning

confidence: 70%

“…Considering the requirement of practical application, the catalyst should not only be active and stable at low temperature but also be economical and environmentally friendly. Manganese oxides, due to their excellent catalytic activity and abundant reserves, exhibit great potential in the elimination of HCHO. , By adjusting the alkali metal content, reducing the thickness of nanosheets, , doping anions, exposing reactive facets, and constructing a three-dimensional structure, , our research group has significantly improved the HCHO decomposition activity of manganese oxides. Based on these studies, it is found that the decomposition activity of HCHO is determined by the property and content of surface oxygen defect in a catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

Zhou

Ding

et al. 2021

ACS Appl. Mater. Interfaces

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Formaldehyde (HCHO) is a priority pollutant in the indoor environment, which is irritative and carcinogenic to humans. The non-noble metal oxides have a wide application prospect in the decomposition of HCHO. Defects in metal oxides have been widely accepted as active sites in heterogeneous catalysis. Compared with the extensive study of oxygen defects, the effect of cation defects has not been clearly addressed. Herein, Mn defect-rich Mn 3 O 4 was synthesized by pyrolysis of Ce-doped MnCO 3 . It is found for the first time that the content of Mn defects in Mn 3 O 4 can be adjusted by introducing Ce. The introduction of Ce resulted in the higher contents of Mn defects, which significantly enhances the HCHO decomposition. Moreover, Mn defect can effectively narrow the half-metallic gap of Mn 3 O 4 , regulate the electronic structure and coordination environment of surrounding oxygen, and further improve the activity and mobility of neighboring oxygen atoms. Importantly, Mn defects are not only beneficial to the generation of neighboring oxygen vacancy but also conducive to enhancing the activation ability of oxygen vacancy for O 2 . The advantages resulting from Mn defects significantly enhance the HCHO decomposition. This research proposes a strategy to adjust cation defects and deepens the comprehension of the function of cation defects.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

Zhou

Ding

et al. 2021

ACS Appl. Mater. Interfaces

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“…Due to its excellent properties, it has exhibited superior activity and stability for formaldehyde oxidation at room temperature, achieving 45% of 100 ppm of formaldehyde mineralized into carbon dioxide. In their follow‐up work, [ 124 ] using MnO 2 NPs as raw materials, they successfully self‐assembled a high‐purity 3D MnO 2 framework via an ice template method, showing excellent catalytic performance for formaldehyde oxidation. Moreover, Sun et al.…”

Section: Modification Of Mno2 Single Species Nanomaterialsmentioning

confidence: 99%

“…On the other hand, the catalytic performance of MnO 2 is also closely related to its morphology. In recent studies, MnO 2 with various morphologies has been prepared for the degradation of formaldehyde, including nanowire, [ 137 ] 3D framework, [ 123,124 ] ultrathin nanosheets, [ 110 ] mesoporous hollow spheres, [ 97 ] hierarchical porous, [ 120 ] 3D ordered mesoporous, [ 115,116 ] etc.…”

Section: Environmental Applicationsmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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“…Nowadays, precious metal catalysts are most commonly used for their high efficiency and versatility for VOC catalytic combustion − but their high cost limits their extensive application. Meanwhile, transition metal oxides have received lots of attention, owing to their natural abundance and relatively high catalytic activity. − Among them, Mn-based oxides are superior substitutes for the catalytic degradation of VOCs due to their excellent redox ability, variable valence, and structure. A series of VOCs have been reported to be efficiently degraded over OMS-2 catalysts. − Peng et al studied the structure performance relationship on the basis of different crystal-type MnO 2 over toluene oxidation and indicated that δ-MnO 2 exhibited the best catalytic performance among all samples due to more oxygen vacancies generated with layer dislocations via Mn 4+ reduction on δ-MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Ag-Doped δ-MnO₂ Nanosheets as Robust Catalysts for Toluene Combustion

Zhang

Zhu

et al. 2020

ACS Appl. Nano Mater.

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Ag-doped δ-MnO2 catalysts were synthesized using an alcohol-initiated redox precipitation method at room temperature; toluene was used as a probe molecule of volatile organic compounds (VOCs) to evaluate the catalytic activity of the as-prepared catalyst. The catalytic activity evaluation revealed that the activity for catalytic combustion of toluene was much enhanced by Ag doping. The optimized catalyst (1Ag-MnO2) presented the best catalytic activity for toluene combustion, with the conversion of toluene corresponding to 50% (T 50) and 90% (T 90) at just 182 and 190 °C under testing conditions, respectively. In addition, 1Ag-MnO2 exhibited excellent long-term stability and water resistance. A series of techniques were used to characterize the as-prepared catalysts, and the characterizations demonstrated that the enhanced catalytic performance of Ag-MnO2 catalysts was closely associated with the much-increased active oxygen species content generated by Ag doping. Therefore, the alcohol-initiated redox precipitation method is a versatile process to prepare Ag-doped MnO2 catalysts, and the as-prepared Ag-doped MnO2 catalyst is a robust material for the abatement of toluene.

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Self-assembly of MnO2 nanostructures into high purity three-dimensional framework for high efficiency formaldehyde mineralization

Cited by 59 publications

References 47 publications

Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

MnO₂‐Based Materials for Environmental Applications

Ag-Doped δ-MnO₂ Nanosheets as Robust Catalysts for Toluene Combustion

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Self-assembly of MnO2 nanostructures into high purity three-dimensional framework for high efficiency formaldehyde mineralization

Cited by 59 publications

References 47 publications

Engineering Manganese Defects in Mn3O4 for Catalytic Oxidation of Carcinogenic Formaldehyde

Engineering Manganese Defects in Mn3O4 for Catalytic Oxidation of Carcinogenic Formaldehyde

MnO2‐Based Materials for Environmental Applications

Ag-Doped δ-MnO2 Nanosheets as Robust Catalysts for Toluene Combustion

Contact Info

Product

Resources

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Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

Engineering Manganese Defects in Mn₃O₄ for Catalytic Oxidation of Carcinogenic Formaldehyde

MnO₂‐Based Materials for Environmental Applications

Ag-Doped δ-MnO₂ Nanosheets as Robust Catalysts for Toluene Combustion