Mechanical exfoliation of boron carbide: A metal-free catalyst for aerobic oxidative desulfurization in fuel

Wu, Peiwen; Jia, Qingdong; He, Jing; Lu, Linjie; Chen, Linlin; Zhu, Jie; Peng, Chong; He, Minqiang; Xiong, Jun; Zhu, Wenshuai; Li, Huaming

doi:10.1016/j.jhazmat.2020.122183

Cited by 42 publications

(32 citation statements)

References 61 publications

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“…Firstly, the bulk ZnIn 2 S 4 (ZIS‐Bulk) is prepared by a low‐temperature reflow method, which is mainly composed of particle aggregations (Figure S2). Assisted by the ultrasonication, ZnIn 2 S 4 nanosheets can be obtained from the exfoliated ZIS‐Bulk, and abundant Zn vacancies are generated simultaneously during the ultrasonication treatment [12] . During the ultrasonication process, the Van der Waals interaction between ZnIn 2 S 4 layers would be broken, and some relative unstable Zn atoms exposed at surface would be extracted due to the higher chemical potential of Zn atoms in the ZnIn 2 S 4 than in the solution [13] .…”

Section: Figurementioning

confidence: 99%

Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Wang

Liu

et al. 2021

ChemSusChem

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Electrocatalytic conversion of carbon dioxide (CO2) is promising for balancing carbon cycles while producing value‐added feedstocks. Herein, ultrathin ZnIn2S4 nanosheets with abundant Zn vacancies are demonstrated for electrochemically reducing CO2 to formate. Specifically, a partial current density of 245 mA cm−2 with a near‐unity faradaic efficiency of 94 % for formate generation was achieved over the ultrathin ZnIn2S4 nanosheets in a flow cell configuration. Experimental and theoretical results revealed that abundant Zn vacancies in the ultrathin ZnIn2S4 nanosheets with a high electrochemically active surface area synergistically optimized the intermediate binding energy and contributed to the boosted selectivity and activity. This work may provide useful understandings in designing efficient catalysts for selective CO2 electroreduction.

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Section: Figurementioning

confidence: 99%

Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Wang

Liu

et al. 2021

ChemSusChem

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“…As illustrated in Figure c, DBT and 4,6-DMDBT showed similar reactivity, achieving complete conversion within 1.5 h, while the conversion rate of BT was lower, reaching 92% in 2 h. The reactivities decreased in the order of DBT > 4,6-DMDBT > BT, which was attributed to the difference of S electron density, for the oxidation of thiophene compounds follows the electrophilic addition principle . Besides, the steric effect of methyl groups may also impact the reaction, resulting in the conversion efficiency of 4,6-DMDBT to be slightly lower than that of DBT. , Furthermore, the reaction products were identified using gas chromatography-mass spectrometry (GC-MS), which were verified to be sulfones (Figure S6).…”

Section: Resultsmentioning

confidence: 90%

“…24 Besides, the steric effect of methyl groups may also impact the reaction, resulting in the conversion efficiency of 4,6-DMDBT to be slightly lower than that of DBT. 63,64 Furthermore, the reaction products were identified using gas chromatography-mass spectrometry (GC-MS), which were verified to be sulfones (Figure S6). The circulation and stability of catalysts directly affect the economic benefits in actual applications.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Engineering the Electronic Structure of Mo Sites in Mn–Mo–O Mixed-Metal Oxides for Efficient Aerobic Oxidative Desulfurization

et al. 2021

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Aerobic oxidative desulfurization (AODS) is a vital development aspect for the deep desulfurization of fuel, which requires catalysts with high performance to efficiently convert thiophenic sulfides to sulfones. Here, we demonstrate that Mo sites in Mn−Mo−O mixed-metal oxides (MMOs) can serve as a robust and stable catalyst for the AODS with oxygen contained in atmospheric air as a sustainable oxidant. By systematically studying the effect of the Mn/Mo ratio on the phase, the electronic structure, and the catalytic activity of the MMOs, we reveal that the Mn species could contribute to the partial reduction of Mo species by donating electrons and thereby cause considerable surface defects, further giving our catalyst an improved catalytic performance with a higher turnover frequency value (TOF) compared to the reported MMOs. We show that the optimal catalyst with a Mn/Mo ratio of 4/1 could achieve complete aerobic conversion of dibenzothiophene (DBT) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT) under mild conditions of 100 °C and atmospheric pressure in 4 h with the TOF value of 4.43 h −1 . Finally, the catalyst can be used repeatedly six times without structural change and performance attenuation.

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“…It is speculated that extending the ball-milling time from 1 to 4 h decreased the particle size of the material, , which increased the surface area. When the ball-milling time was extended to 12 h, surface energies and spontaneous aggregation increased, especially considering the intrinsic magnetic properties of the material.…”

Section: Resultsmentioning

confidence: 99%

“…H 2 -TPR curves in Figure show the redox properties of the Mn–Fe-oxides/biochar composites. The peak at about 420 °C belongs to the reduction of MnO 2 to Mn 2 O 3 ; the peak at about 500 °C belongs to the reduction of Mn 2 O 3 to MnO or reduction of Fe 2 O 3 to Fe; and the peak at about 610 °C is ascribed to Fe 3 O 4 to FeO …”

Section: Resultsmentioning

confidence: 99%

Solvent-Free Synthesis of MnOx-FeOx/Biochar for Hg⁰ and o-Xylene Removal from Flue Gas

et al. 2021

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Volatile organic compounds (VOCs) and Hg adversely affect the health of communities in coal-based economies in countries that depend on coal-fired power plants. In this study, biochar with incorporated Mn–Fe oxide composite was synthesized by co-ball milling of metal ions and biomass, followed by in situ pyrolysis carbonization and oxidation. The scanning electron microscopy (SEM) result shows that the generated metal oxides were incorporated into the biochar matrix rather than being physically deposited. By avoiding wet impregnation in the MnFe loading process, abundant functional groups were preserved on the surface of the materials. MnFe oxide homogeneity and dispersion on biochar were effectively promoted by mechanochemical synthesis for 4 h and showed high Mn and Fe oxidation states and a large amount of Lewis acid of 56.47 mol/g. Effectively promoted by these properties, the Mn–Fe oxides/biochar composite efficiently purified Hg0 and VOC by adsorption and catalytic oxidation from simulated coal-fired flue gas. The mutual inhibitory effect between Hg0 and o-xylene is pounced at high reaction temperatures when catalytic oxidation dominated. The mechanochemical strategy endowed the Mn–Fe oxides/biochar composite with strong magnetic properties, showing a saturation magnetization of 24.33 emu/g, which enabled 100% separation of the material from coal-fired fly ash.

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Mechanical exfoliation of boron carbide: A metal-free catalyst for aerobic oxidative desulfurization in fuel

Cited by 42 publications

References 61 publications

Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Engineering the Electronic Structure of Mo Sites in Mn–Mo–O Mixed-Metal Oxides for Efficient Aerobic Oxidative Desulfurization

Solvent-Free Synthesis of MnOx-FeOx/Biochar for Hg⁰ and o-Xylene Removal from Flue Gas

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Mechanical exfoliation of boron carbide: A metal-free catalyst for aerobic oxidative desulfurization in fuel

Cited by 42 publications

References 61 publications

Exfoliated Ultrathin ZnIn2S4 Nanosheets with Abundant Zinc Vacancies for Enhanced CO2 Electroreduction to Formate

Exfoliated Ultrathin ZnIn2S4 Nanosheets with Abundant Zinc Vacancies for Enhanced CO2 Electroreduction to Formate

Engineering the Electronic Structure of Mo Sites in Mn–Mo–O Mixed-Metal Oxides for Efficient Aerobic Oxidative Desulfurization

Solvent-Free Synthesis of MnOx-FeOx/Biochar for Hg0 and o-Xylene Removal from Flue Gas

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Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Exfoliated Ultrathin ZnIn₂S₄ Nanosheets with Abundant Zinc Vacancies for Enhanced CO₂ Electroreduction to Formate

Solvent-Free Synthesis of MnOx-FeOx/Biochar for Hg⁰ and o-Xylene Removal from Flue Gas