Enhanced oxygen vacancies to improve ethyl acetate oxidation over MnOx-CeO2 catalyst derived from MOF template

Jiang, Yiwen; Gao, Jingheng; Zhang, Qian; Liu, Ziyi; Fu, Mingli; Wu, Junliang; Hu, Yun; Ye, Daiqi

doi:10.1016/j.cej.2019.03.233

Cited by 142 publications

(32 citation statements)

References 43 publications

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“…Afterward, the colloidal suspension was continuously ultrasonicated for 10 h. Finally, the mixture was transferred into a 45 mL Teflon vessel at 160 ◦ C for 24 h in an airtight environment. The material was then separated and cleaned in an acidic solution to remove extra unreacted oxides. − …”

Section: Methodsmentioning

confidence: 99%

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

et al. 2021

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Platinum (Pt)-based-nanomaterials are currently the most successful catalysts for the oxygen reduction reaction (ORR) in electrochemical energy conversion devices such as fuel cells and metal-air batteries. Nonetheless, Pt catalysts have serious drawbacks, including low abundance in nature, sluggish kinetics, and very high costs, which limit their practical applications. Herein, we report the first rationally designed nonprecious Co–Cu bimetallic metal–organic framework (MOF) using a low-temperature hydrothermal method that outperforms the electrocatalytic activity of Pt/C for ORR in alkaline environments. The MOF catalyst surpassed the ORR performance of Pt/C, exhibiting an onset potential of 1.06 V vs RHE, a half-wave potential of 0.95 V vs RHE, and a higher electrochemical stability (ΔE 1/2 = 30 mV) after 1000 ORR cycles in 0.1 M NaOH. Additionally, it outperformed Pt/C in terms of power density and cyclability in zinc-air batteries. This outstanding behavior was attributed to the unique electronic synergy of the Co−Cu bimetallic centers in the MOF network, which was revealed by XPS and PDOS.

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Section: Methodsmentioning

confidence: 99%

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

et al. 2021

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“…Hence, the manganese oxides were successfully prepared by the pyrolysis of MOFs. However, the XRD peaks from MnO x -NA are weaker and broader than those from MnO x -A, which indicates that MnO x -NA had smaller crystalline grains with more lattice distortions . This phenomenon is related to the confinement effect of amorphous carbon derived from MOFs during the nitrogen pyrolysis.…”

Section: Resultsmentioning

confidence: 95%

“…These are assigned to surface lattice oxygen (O latt ), surface adsorbed oxygen (O ads ), and chemisorbed water (O w ), respectively. , As shown in Table , MnO x -NA exhibits the highest O ads /O latt molar ratio of 0.67, which indicates there are more O v in MnO x -NA . It was considered that O v played a significant role in the oxidation for VOCs. ,, Therefore, the rich Mn 3+ and O ads demonstrate that the in situ carbon-confinement process is conducive to expose and generate O v on the surface of MnO x with the assistance of reductive carbon. , Moreover, to further gain information on the O v , Raman and EPR were employed as the effective techniques. As depicted in Figure c, the bands at 307, 648, and 700 cm –1 are detected for MnO x -B; the bands at 363, 473, and 651 cm –1 are detected for MnO x -A; and the bands at 307, 653, and 698 cm –1 are detected for MnO x -NA.…”

Section: Resultsmentioning

confidence: 99%

“…However, the XRD peaks from MnO x -NA are weaker and broader than those from MnO x -A, which indicates that MnO x -NA had smaller crystalline grains with more lattice distortions. 33 This phenomenon is related to the confinement effect of amorphous carbon derived from MOFs during the nitrogen pyrolysis. As shown in Figure S5a,b, MnO x -NA exhibits homogeneous, welldispersed particles, while MnO x -A presents clear particle aggregation (Figure 2h).…”

Section: Resultsmentioning

confidence: 99%

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Defective Ultrafine MnO_x Nanoparticles Confined within a Carbon Matrix for Low-Temperature Oxidation of Volatile Organic Compounds

Zheng

Liu

Shan

et al. 2021

Environ. Sci. Technol.

119

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The development of catalysts for volatile organic compound (VOC) treatment by catalytic oxidation is of great significance to improve the atmospheric environment. Size-effect and oxygen vacancy engineering are effective strategies for designing high-efficiency heterogeneous catalysts. Herein, we explored the in situ carbon-confinement-oxidation method to synthesize ultrafine MnO x nanoparticles with adequately exposed defects. They exhibited an outstanding catalytic performance with a T 90 of 167 °C for acetone oxidation, which is 73 °C lower than that of bulk MnO x (240 °C). This excellent catalytic activity was primarily ascribed to their high surface area, rich oxygen vacancies, abundant active oxygen species, and good reducibility at low temperatures. Importantly, the synthesized ultrafine MnO x exhibited impressive stability in long-term, cycling and water-resistance tests. Moreover, the possible mechanism for acetone oxidation over MnO x -NA was revealed. In this work, we not only prepared a promising material for removing VOCs but also provided a new strategy for the rational design of ultrafine nanoparticles with abundant defects.

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“…Volatile organic compounds (VOCs) have been considered as the main component of air pollution due to their low boiling point between room temperature and 250 °C, such as formaldehyde (HCHO), ethyl acetate (CH 3 COOCH 2 CH 3 ), and benzene (C 6 H 6 ), etc. − HCHO is regarded as the primary indoor pollutant, which is emitted from wooden building materials, artificial board, and wooden furniture with a long release time. Human exposure to HCHO for a long time can cause various diseases, such as respiratory diseases, pneumonia, allergies, leukemia, and even cancer. − Therefore, it is very urgent to remove HCHO quickly and easily under indoor conditions.…”

Section: Introductionmentioning

confidence: 99%

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Song

Chai

et al. 2020

ACS Sustainable Chem. Eng.

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The removal of formaldehyde (HCHO) has attracted tremendous attention, because the toxicity and volatility of HCHO seriously affect human health. It is urgent to develop a catalyst that can efficiently remove HCHO in indoor conditions. Here, the Bi 2 MoO 6 /Bi/g-C 3 N 4 heterojunction is prepared by a simple hydrothermal approach and subsequently an in situ reduction. The prepared material is used to photocatalytic degrade HCHO from 50 to 1600 ppm under simulated indoor conditions, presenting 96.15% conversion for 200 ppm and 98.80% for 1600 ppm under 10 h of visible light irradiation. Its long-term utility was confirmed with an unchanged activity after six recycling tests at a long 60 h of visible light illumination. An environmental factor estimation indicates its superior CO 2 selectivity (99.79%) and excellent humidity resistance. The good performances are assigned to the Bi nanoparticles produced in situ, linking Bi 2 MoO 6 and g-C 3 N 4 together, which contribute to the excellent visible light harvesting, quick separation of electron−hole pairs, strong adsorption toward HCHO, and less shedding and aggregation. The materials could also be utilized to effectively removal general gaseous pollutants (C 6 H 6 and CH 3 COOCH 2 CH 3 ). This work is expected to develop a novel material that could be potentially integrated into the instrument for remedying of indoor gas.

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Enhanced oxygen vacancies to improve ethyl acetate oxidation over MnOx-CeO2 catalyst derived from MOF template

Cited by 142 publications

References 43 publications

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

Defective Ultrafine MnO_x Nanoparticles Confined within a Carbon Matrix for Low-Temperature Oxidation of Volatile Organic Compounds

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

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Enhanced oxygen vacancies to improve ethyl acetate oxidation over MnOx-CeO2 catalyst derived from MOF template

Cited by 142 publications

References 43 publications

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

Co–Cu Bimetallic Metal Organic Framework Catalyst Outperforms the Pt/C Benchmark for Oxygen Reduction

Defective Ultrafine MnOx Nanoparticles Confined within a Carbon Matrix for Low-Temperature Oxidation of Volatile Organic Compounds

Facile Construction of Bi2MoO6/Bi/g-C3N4 toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Contact Info

Product

Resources

About

Defective Ultrafine MnO_x Nanoparticles Confined within a Carbon Matrix for Low-Temperature Oxidation of Volatile Organic Compounds

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation