SCILL-SILP hybrid catalytic system by employing carbon nanotubes as a support for the selective oxidation of ethylbenzene to acetophenone

Azam, Shakir Ul; Peckh, Kamil; Orlińska, Beata

doi:10.1016/j.cej.2022.141207

Cited by 7 publications

(5 citation statements)

References 58 publications

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“…Since the UCo@NC catalyst had the lowest specific surface area and the largest average cobalt particle size among the three samples ( Table 1 ), which is unfavorable to catalytic activity, other factors should be responsible for its excellent catalytic performance. Mou [ 11 ] reported that increasing the total N content and the sharing of pyridinic N could enhance the catalytic performance in the oxidation of aromatic hydrocarbons. However, the as prepared UCo@NC catalyst did not conform to this observation ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…A representative example is the selective oxidation of ethylbenzene to acetophenone, which is an important organic intermediate for various pharmaceuticals, perfumes and fine chemicals [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. However, the available methods for ethylbenzene oxidation generally show some drawbacks, such as harsh reaction conditions (e.g., high temperature/pressure), environmental pollutions (e.g., hazardous oxidants and organic solvents) and low catalytic performances [ 9 , 10 , 11 , 12 ]. As a result, it is interesting and urgent to solve these problems in the basic research and industrial practice of EB oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Cobalt Encapsulated in Nitrogen-Doped Graphite-like Shells as Efficient Catalyst for Selective Oxidation of Arylalkanes

Li,

Ali,

Zuhra

et al. 2023

Molecules

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Selective oxidation of ethylbenzene to acetophenne is an important process in both organic synthesis and fine chemicals diligence. The cobalt-based catalysts combined with nitrogen-doped carbon have received great attention in ethylbenzene (EB) oxidation. Here, a series of cobalt catalysts with metallic cobalt nanoparticles (NPs) encapsulated in nitrogen-doped graphite-like carbon shells (Co@NC) have been constructed through the one-pot pyrolysis method in the presence of different nitrogen-containing compounds (urea, dicyandiamide and melamine), and their catalytic performance in solvent-free oxidation of EB with tert-butyl hydrogen peroxide (TBHP) as an oxidant was investigated. Under optimized conditions, the UCo@NC (urea as nitrogen source) could afford 95.2% conversion of EB and 96.0% selectivity to acetophenone, and the substrate scalability was remarkable. Kinetics show that UCo@NC contributes to EB oxidation with an apparent activation energy of 32.3 kJ/mol. The synergistic effect between metallic cobalt NPs and nitrogen-doped graphite-like carbon layers was obviously observed and, especially, the graphitic N species plays a key role during the oxidation reaction. The structure–performance relationship illustrated that EB oxidation was a free radical reaction through 1-phenylethanol as an intermediate, and the possible reaction mechanistic has been proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cobalt Encapsulated in Nitrogen-Doped Graphite-like Shells as Efficient Catalyst for Selective Oxidation of Arylalkanes

Li,

Ali,

Zuhra

et al. 2023

Molecules

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“…Similarly the oxidation of ethylbenzene to acetophenone was accomplished by CNT functionalized with Cu(II) and coated with ILs. 1547…”

Section: Oxidation Of C−h Bondsmentioning

confidence: 99%

“…Ethylbenzene oxidation with oxygen was reported by SiO 2 or PS coated with CoCl 2 dissolved in various ILs but with relative low conversion. Similarly the oxidation of ethylbenzene to acetophenone was accomplished by CNT functionalized with Cu(II) and coated with ILs …”

Section: Oxidationmentioning

confidence: 99%

Ionic Liquids in Metal, Photo-, Electro-, and (Bio) Catalysis

Dupont,

Leal,

Lozano

et al. 2024

Chem. Rev.

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“…In recent years, direct C–H bond activation of hydrocarbons to carbonyl compounds has been recognized as one of the most straightforward methods and a valuable strategy in organic synthesis and industrial chemistry. − Acetophenone (AP), as a crucial chemical intermediate for the petrochemical industry, has been widely utilized in manufacturing pharmaceuticals, alcohol, esters, perfumes, and other products. − AP has conventionally been prepared by Friedel–Crafts acylation using aluminum trichloride as a catalyst, , which requires a corresponding stoichiometric inorganic oxidant (such as permanganate or dichromate), producing large amounts of corrosive and hazardous waste . Therefore, it is highly essential to develop an efficient and eco-friendly approach to preparing AP for a sustainable society.…”

Section: Introductionmentioning

confidence: 99%

Novel Cobalt(II)-Decorated 1D Covalent Organic Framework for Selective Oxidation of Ethylbenzene

Lin,

Wang,

Qiao

et al. 2024

ACS Sustainable Chem. Eng.

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As one of the most direct methods to construct molecular scaffolds in fine chemicals, C–H bond oxidation is a hot research area in catalysis. One-dimensional covalent organic frameworks (1D-COFs) developed recently have attracted growing attention for catalytic applications owing to their unique edge microstructure. Herein, a novel crystalline 1D-COF (FZU-66) was constructed and further decorated with cobalt(II), which led to excellent heterogeneous catalytic performance in the C–H bond oxidation of ethylbenzene. In an aqueous solution at room temperature within 16 h, the conversion is nearly 100%, while the acetophenone selectivity is around 99%. More impressively, the designed single-dispersed cobalt(II)-coordinated 1D-COF (FZU-66-Co) retained good catalytic activity while maintaining high crystallinity after at least five consecutive recycling experiments. This work will prompt the application of porous polymers in the catalyzed oxidation of C–H bonds and make it an efficient and sustainable platform for activating C–H bonds of aromatic hydrocarbons.

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SCILL-SILP hybrid catalytic system by employing carbon nanotubes as a support for the selective oxidation of ethylbenzene to acetophenone

Cited by 7 publications

References 58 publications

Cobalt Encapsulated in Nitrogen-Doped Graphite-like Shells as Efficient Catalyst for Selective Oxidation of Arylalkanes

Cobalt Encapsulated in Nitrogen-Doped Graphite-like Shells as Efficient Catalyst for Selective Oxidation of Arylalkanes

Ionic Liquids in Metal, Photo-, Electro-, and (Bio) Catalysis

Novel Cobalt(II)-Decorated 1D Covalent Organic Framework for Selective Oxidation of Ethylbenzene

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