HCHO Removal by MnO2(x)–CeO2: Influence of the Synergistic Effect on the Catalytic Activity

Guan, Shengnan; Huang, Qifu; Ma, Jianru; Li, Wenzhi; Ogunbiyi, Ajibola T.; Zhou, Zean; Zhang, Qi

doi:10.1021/acs.iecr.9b05191

Cited by 41 publications

(23 citation statements)

References 38 publications

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“…The proportion of surface activity oxygen is summarized in Table . Obviously, Co 3 O 4 addition resulted in a significantly higher concentration of O sur species than that of the Au/CeO 2 -500 °C sample, which was consistent with the Ce 3d spectral analysis; that is, more oxygen vacancies exposed more insufficiently coordinated Ce atoms to adsorb oxygen and provided delocalized electrons to the surface-adsorbed oxygen molecules to activate them, thereby significantly increasing the content of O sur …”

Section: Resultssupporting

confidence: 78%

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Duan

Hao

et al. 2020

ACS Appl. Nano Mater.

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CO oxidation at room temperature has become a hot research topic due to its scientific and environmental applications, and nanoscale catalysts are considered to be a bridge to this goal. In this study, a three-dimensional (3D) porous nanosheet/nanorod woven Au/Co 3 O 4 -CeO 2 catalyst with a large specific surface area was prepared by dealloying Al−Ce−Co−Au precursor alloy ribbons combined with calcination. The experimental results revealed that the Au nanoparticles were loaded on both Co 3 O 4 nanosheets and CeO 2 nanorods. The optimized Au/ Co 3 O 4 -CeO 2 catalyst can completely convert CO at near room temperature (30 °C) under a high space velocity (60 000 h −1 ), exhibiting a significant improvement compared to Au/CeO 2 , and the catalytic activity does not exhibit any decrease tendency even after 125 h of continuous performance in feed gas with a very high vapor concentration (5 × 10 4 to 2 × 10 5 ppm), which implied the extreme stability and water vapor resistance of the catalyst. Systematic characterizations revealed that the improvements in catalytic activity can be attributed to the small amount of nanoscale Co 3 O 4 added, which significantly increased the oxygen vacancies and surface active oxygen species in the sample. Moreover, the rough interfaces formed by the interweaving of nanosheets and nanorods also enhanced the strong metal−support interactions, thereby increasing the concentration of more active Au δ+ species. In addition, the process of CO catalytic oxidation on samples and the CO oxidation mechanism under anaerobic conditions were investigated by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS), paving a feasible pathway for the rational design of highperformance nanoscale catalysts. KEYWORDS: melt-spun Al−Ce−Co−Au ribbon, Au/Co 3 O 4 -CeO 2 catalyst, CO oxidation, water vapor resistant, room-temperature catalyst

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Section: Resultssupporting

confidence: 78%

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Duan

Hao

et al. 2020

ACS Appl. Nano Mater.

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“…The as‐constructed MnO 2 NW–CeO 2 NP binary heterostructures have been applied to the catalytic reduction of NO x , showing excellent performances and making them suitable for a wide working temperature range from 100 to 400 °C. Other MnO 2 /CeO 2 binary heterojunctions for environmental purification have also been reported by researchers, including MnO 2 /CeO 2 –MnO 2 nanocomposites for elemental mercury removal, [ 202 ] MnO 2 /CeO 2 for the catalytic degradation of methyl orange with the assistance of ultrasound, [ 203–205 ] δ‐MnO 2 /CeO 2 for toluene [ 206 ] and formaldehyde [ 207 ] catalytic combustions, MnO 2 /CeO 2 core–shell structures for the catalytic oxidation of CO [ 208 ] and catalytic reduction of NO x , [ 209,210 ] and trepang‐like MnO 2 /CeO 2 for soot removal. [ 211 ]…”

Section: Fabrication Of Mno2‐based Compositesmentioning

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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“…Qu et al 21 synthesized 3D Au-Ce x Co y /GA catalysts that possessed 100% HCHO removal activity at 60 °C. This is because the synergistic effect on CeO 2 and metal oxide supports enormously promoted the activation and metastasis of molecular oxygen, and Guan et al 22 also reported such a promotion mechanism.…”

Section: Introductionmentioning

confidence: 99%

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature

Chen

Huang

Chen

et al. 2020

Ind. Eng. Chem. Res.

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The inherent low activity at room temperature has greatly limited the utilization of Co 3 O 4 in indoor air purification. In this work, an extremely facile and mild method utilizing the strong oxidation of H 2 O 2 was designed to prepare a novel Co 3 O 4 -HP catalyst. The Co 3 O 4 -HP catalyst exhibits excellent removal activity for low-level concentration (∼1 ppm) of formaldehyde (HCHO) at room temperature. Under the static test mode, it shows 90.62% HCHO removal efficiency in 180 min at an RH of ∼55%. Under the dynamic test mode, it maintains the performance to remove approximately 97.26% of HCHO within 180 min under a GHSV of ∼90,000 mL•h −1 •g −1 . Additionally, the HCHO removal efficiency of Co 3 O 4 -HP is also maintained at around 94.76% under a higher GHSV of ∼150,000 mL•h −1 •g −1 . Such a satisfying activity is due to abundant oxygen vacancy defects bringing about a large number of surface reactive oxygen species and high redox capacity and oxygen migration capacity. It is also because of the synergistic effect of surface OH groups. This strategy will open an exciting avenue to design outstanding catalysts for HCHO removal by defect engineering and the synergistic effect.

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HCHO Removal by MnO₂(x)–CeO₂: Influence of the Synergistic Effect on the Catalytic Activity

Cited by 41 publications

References 38 publications

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

MnO₂‐Based Materials for Environmental Applications

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature

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HCHO Removal by MnO2(x)–CeO2: Influence of the Synergistic Effect on the Catalytic Activity

Cited by 41 publications

References 38 publications

Co3O4 Nanosheet/Au Nanoparticle/CeO2 Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co3O4 Nanosheet/Au Nanoparticle/CeO2 Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

MnO2‐Based Materials for Environmental Applications

Defect Engineering and Synergistic Effect in Co3O4 Catalysts for Efficient Removal of Formaldehyde at Room Temperature

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Resources

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HCHO Removal by MnO₂(x)–CeO₂: Influence of the Synergistic Effect on the Catalytic Activity

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

MnO₂‐Based Materials for Environmental Applications

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature