Montmorillonite-assisted synthesis of cobalt-nitrogen-doped carbon nanosheets for high-performance selective oxidation of alkyl aromatics

Jie, Shanshan; Lin, Xiu; Chen, Qingze; Zhang, Liyun; Zhang, Bingsen; Liu, Zhigang

doi:10.1016/j.apsusc.2018.06.109

Cited by 14 publications

(6 citation statements)

References 41 publications

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“…2 Previous studies have devoted tremendous efforts to SACs for various electrochemical reactions. [3][4][5][6][7][8][9][10] However, the application of SACs and DACs for photochemical reactions such as 1 O 2 sensitization, the CO 2 reduction reaction (CO 2 RR), the oxygen reduction reaction (ORR), the hydrogen evolution reaction (HER), the N 2 reduction reaction (NRR), and photoinduced electron/energy transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization has rarely been reported. 11,12 More specically, 1 O 2 sensitization can be used for organic synthesis, wastewater treatment, and photodynamic therapy (PDT).…”

Section: Introductionmentioning

confidence: 99%

Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction

Tamtaji

Liu

et al. 2023

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction

Tamtaji

Liu

et al. 2023

J. Mater. Chem. A

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“…Moreover, it has excellent selectivity with minor byproducts. Jie et al considered using a porous two-dimensional carbon nanosheet support to disperse cobalt porphyrin (precursor for both carbon and nitrogen) and pyrolyze the composite to have abundant and highly dispersed active sites for ethylbenzene oxidation to acetophenone. The carbon nanosheet was synthesized by the hydrothermal treatment of a mixture of rhodamine B and CTAB-pillared montmorillonite, and the cobalt porphyrin was supported on the carbon nanosheet via impregnation.…”

Section: Eb Oxidation In Heterogeneously Catalyzed Systemsmentioning

confidence: 99%

Selective Catalytic Oxidation of Ethylbenzene to Acetophenone: A Review of Catalyst Systems and Reaction Mechanisms

Azeez,

Nafiu,

Olarewaju

et al. 2023

Ind. Eng. Chem. Res.

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Acetophenone is an important chemical intermediate often employed in the production chain of many pharmaceuticals, agrochemicals, food, and cosmetic products. It is industrially produced as a byproduct of the Hock process. However, a growing demand for acetophenone has necessitated consideration of alternative production routes. The oxidation of ethylbenzene to acetophenone (OEB-A) is one of the most considered alternatives due to the low cost and availability of ethylbenzene (EB). The EB is one of the products of refinery downstream processes that is obtained from the xylene/EB isomerization unit. Although the OEB-A reaction is considered inexpensive, it has not been of great interest due to the inert behavior of C−H bond, relatively low acetophenone selectivity, and cumbersome separation strategies for extracting acetophenone from other reaction byproducts. In this Review, we discuss the recent advances in the OEB-A reaction covering both homogeneous and heterogeneous systems. Advances in catalyst design and development including ligand design and coordination strategies and tuning of support properties have, over the years, proven to be effective in increasing acetophenone selectivity during the OEB-A process. Exploring a single-atom catalyst's definitive active centers and high atom efficiency in the OEB-A reaction has demonstrated high-throughput results, even though not well harnessed due to the challenges of controlled synthesis of single-atom metal catalyst. Solvent-free, the OEB-A reaction has demonstrated to be attractive due to its ease of product collection and environmental friendliness. Green synthesis strategies such as metal-free OEB-A reaction and CO 2 -assisted OEB-A reaction have been reviewed. The CO 2 assisted OEB-A reaction has not received the desired attention, even though considerable improvement in catalytic performance was reported. Considering the importance of carbon circular economy and the ready availability of CO 2 , the CO 2 assisted OEB-A reaction could be an interesting research focus in the near future.

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“…A similar phenomenon could be observed in the field of C-H bonds oxidation. NCs combined with cobalt (Co/NCs) have been prepared by a variety of methods and investigated as catalysts for arylalkane oxidation with various oxidants [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. For instance, cobalt single atoms supported on carbon nitride (Co SACs) showed 46% conversion of ethylbenzene using air as oxidant, whereas the nanosized or homogenous Co catalysts were surprisingly inert to the reaction [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Although the above examples have illustrated that the Co/NC catalysts display remarkable catalytic performance for EB oxidation, the synthesis process of these catalysts is tedious or complicated and may involve high-cost Co/N sources or harsh preparation conditions [ 3 , 9 , 27 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Wang [ 34 ] designed composite catalysts of N-doped carbon with cobalt and gold for selective oxidation of alcohol into ester.…”

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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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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Montmorillonite-assisted synthesis of cobalt-nitrogen-doped carbon nanosheets for high-performance selective oxidation of alkyl aromatics

Cited by 14 publications

References 41 publications

Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction

Single and dual metal atom catalysts for enhanced singlet oxygen generation and oxygen reduction reaction

Selective Catalytic Oxidation of Ethylbenzene to Acetophenone: A Review of Catalyst Systems and Reaction Mechanisms

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

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