Magnetic nano-structured cobalt–cobalt oxide/nitrogen-doped carbon material as an efficient catalyst for aerobic oxidation of p -cresols

Cheng, Liang; Li, Xuefeng; Su, Danyang; Ma, Qiyi; Mao, Jiale; Chen, Zhirong; Wang, Yong; Yao, Jia; Li, Haoran

doi:10.1016/j.mcat.2018.05.005

Cited by 24 publications

(8 citation statements)

References 73 publications

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“…42-1467) [37]. These results are in accordance with previously reported results [21,37,38]. The Co/S3N2-GF XRD patterns present one peak at 2θ = 26º assigned to the (002) XRD plane of stacked graphene layers, and those assigned to Co3O4 NPs.…”

Section: Electrocatalysts Characterizationsupporting

confidence: 91%

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

et al. 2020

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To address aggravating environmental and energy problems, active, efficient, low-cost, and robust electrocatalysts (ECs) are actively pursued as substitutes for the current noble metal ECs. Therefore, in this study, we report the preparation of graphene flakes (GF) doped with S and N using 2-5-dimercapto-1,3,4-thiadiazole (S3N2) as precursor followed by the immobilization of cobalt spinel oxide (Co3O4) or manganese spinel oxide (Mn3O4) nanoparticles through a one-step co-precipitation procedure (Co/S3N2–GF and Mn/S3N2–GF). Characterization by different physicochemical techniques (Fourier Transform Infrared (FTIR), Raman spectroscopy, Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD)) of both composites shows the preservation of the metal oxide spinel structure and further confirms the successful preparation of the envisaged electrocatalysts. Co/S3N2–GF composite exhibits the best ORR performance with an onset potential of 0.91 V vs. RHE, a diffusion-limiting current density of −4.50 mA cm−2 and selectivity for the direct four-electron pathway, matching the results obtained for commercial Pt/C. Moreover, both Co/S3N2–GF and Mn/S3N2–GF showed excellent tolerance to methanol poisoning and good stability.

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Section: Electrocatalysts Characterizationsupporting

confidence: 91%

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

et al. 2020

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“…In recent years, with the aim of combining the advantages of homogeneous and heterogeneous catalytic processes, nanoparticles have been employed due to their high surface area and facile recovery . Important nano‐heterogeneous supports such as metal oxides, carbon nanotubes, ionic liquids, molecular sieves (SBA‐15, MCM‐41 and MCM‐48), alumina, peptide nanofibers, silica nanoparticles, polymers, graphene oxide and heteropoly acids have been employed for the heterogenization of homogeneous catalysts . Among the various supports, boehmite nanoparticles are considered as outstanding solid supports because of their physical and chemical properties such as excellent thermal and chemical stability, large internal surface area and high concentration of surface OH groups.…”

Section: Introductionmentioning

confidence: 99%

Boehmite@tryptophan‐Pd nanoparticles: A new catalyst for C–C bond formation

Ghorbani‐Choghamarani

Mohammadi

Hudson

et al. 2019

Applied Organom Chemis

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A boehmite@tryptophan-Pd nanoparticulate catalyst was prepared by a simple, fast and convenient route. The nanomaterial was characterized using various techniques and employed as a thermally stable catalyst for Heck, Stille and Suzuki cross-coupling reactions. Optimized conditions for these reactions are described. The catalyst could be isolated, post-reaction, by simple filtration and recycled for several consecutive cycles without a notable change in its activity.

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“…Finally, embedded bimetallic NiCo was examined with selective hydrogenation of alkenes and alkynes [23] . In contrast, oxidative reactions mainly focus on encapsulated Co catalysts for oxidative dehydrogenation of N‐heterocycles, aerobic oxidation of alcohols, hydrocarbons, and p ‐cresols [33–35] …”

Section: Introductionmentioning

confidence: 99%

“…[23] In contrast, oxidative reactions mainly focus on encapsulated Co catalysts for oxidative dehydrogenation of N-heterocycles, aerobic oxidation of alcohols, hydrocarbons, and p-cresols. [33][34][35] Generally, the encapsulated structure effectively enhances catalyst stability by protecting the confined metal-NPs within the carbon shells from leaching, aggregation, poisoning and harsh/corrosive reaction conditions. For example, an acidresistant catalyst of carbon nitride (CN) with underlying Ni was investigated for nitroarene hydrogenation under strongly acidic conditions.…”

Section: Introductionmentioning

confidence: 99%

H₂ Activation with Co Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes for Green Synthesis of Benzimidazoles

et al. 2020

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Co nanoparticles (NPs) encapsulated in N‐doped carbon nanotubes (Co@NC900) are systematically investigated as a potential alternative to precious Pt‐group catalysts for hydrogenative heterocyclization reactions. Co@NC900 can efficiently catalyze hydrogenative coupling of 2‐nitroaniline to benzaldehyde for synthesis of 2‐phenyl‐1H‐benzo[d]imidazole with >99 % yield at ambient temperature in one step. The robust Co@NC900 catalyst can be easily recovered by an external magnetic field after the reaction and readily recycled for at least six times without any evident decrease in activity. Kinetic experiments indicate that Co@NC900‐promoted hydrogenation is the rate‐determining step with a total apparent activation energy of 41±1 kJ mol−1. Theoretical investigations further reveal that Co@NC900 can activate both H2 and the nitro group of 2‐nitroaniline. The observed energy barrier for H2 dissociation is only 2.70 eV in the rate‐determining step, owing to the presence of confined Co NPs in Co@NC900. Potential industrial application of the earth‐abundant and non‐noble transition metal catalysts is also explored for green and efficient synthesis of heterocyclic compounds.

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Magnetic nano-structured cobalt–cobalt oxide/nitrogen-doped carbon material as an efficient catalyst for aerobic oxidation of p -cresols

Cited by 24 publications

References 73 publications

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

Boehmite@tryptophan‐Pd nanoparticles: A new catalyst for C–C bond formation

H₂ Activation with Co Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes for Green Synthesis of Benzimidazoles

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Magnetic nano-structured cobalt–cobalt oxide/nitrogen-doped carbon material as an efficient catalyst for aerobic oxidation of p -cresols

Cited by 24 publications

References 73 publications

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

Metal Oxide (Co3O4 and Mn3O4) Impregnation into S, N-doped Graphene for Oxygen Reduction Reaction (ORR)

Boehmite@tryptophan‐Pd nanoparticles: A new catalyst for C–C bond formation

H2 Activation with Co Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes for Green Synthesis of Benzimidazoles

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Product

Resources

About

H₂ Activation with Co Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes for Green Synthesis of Benzimidazoles