CuO/Graphene Oxide Nanocomposite as Highly Active and Durable Catalyst for Selective Oxidation of Cyclohexane

Abstract

Achieving breakage of C−H bond of hydrocarbons performance still remains a significant challenge in oxidation chemistry for heterogeneous catalyst. In this work, we report copper oxide‐ graphene oxide (CuO‐GO) nanocomposites as durable and highly active and selective catalyst for oxidation of cyclohexane. Different wt% of Cu(II) loaded on RGO surface to form a nanocomposite as well as Co(II) and Ni(II) loaded GO composites were prepared by wet impregnation method. The efficacy of catalyst was tested towards selective oxidation of cyclohexane. 5wt%CuO‐GO proved to be superior in terms improved selectivity towards cyclohexanone (82 %) and short reaction times, plus easy recovery and reusability of the catalyst. The presence of functional groups prevent the aggregation of catalytically active CuO species during the reaction progress.

A Facile Synthesis of ZrOx-MnCO3/Graphene Oxide (GRO) Nanocomposites for the Oxidation of Alcohols using Molecular Oxygen under Base Free Conditions

“…Various metal or metal oxide NPs, such as Au [24], Pd [25], Fe 2 O 3 [26], Co 3 O 4 [27], and ZnO [28], have been immobilized onto GRO nanosheets, which exhibited outstanding catalytic activity and selectivity. In particular, graphene oxide-based metal or metal oxide nanocomposites are utilized as an efficacious oxidation catalyst for the oxidation of numerous organic moieties, such as alcohols [19,29], cyclohexane [30,31], amines [32], olefins [33], benzene [34], and ethylbenzene [35]. In all these catalysts, the GRO support was found to play a key role in the effectiveness as a catalyst both from the architecture to the functional level.…”

Carbon Nitride‐Supported Silver Nanoparticles: Microwave‐ Assisted Synthesis of Propargylamine and Oxidative C‐C Coupling Reaction

“…The biggest advantage of heterogeneous catalyst is that they are easily separated from the final reaction mixture by simple filtration or centrifuge methods. Today, the scope of heterogeneous catalyst increases more and more due to their higher selectivity towards the product, excellent recyclability, and good stability …”

Catalyst-free and solvent-free oxidation of cycloalkanes (C5-C8) with molecular oxygen: Determination of autoxidation temperature and product distribution

“…The oxidation of cycloalkanes to corresponding cycloalkanols, cycloalkanones and aliphatic diacids is an extremely important chemical transformation not only in chemical industry but also in academic research, especially for cyclohexane [1][2][3][4][5][6][7][8][9]. In the oxidation of cyclohexane, the obtained cyclohexanol and cyclohexanone are very important intermediates in the production of caprolactam, and adipic acid which is the irreplaceable precursor in the production of nylon-66 and nylon-6 polymers [10][11][12][13][14][15][16][17][18][19]. Glutaric acid, heptanedioic acid and octanedioic acid obtained from oxidation of the corresponding cycloalkane directly or indirectly are important precursors in the production of various macromolecule polymers too [20][21][22][23][24].…”

“…Among these oxidants, molecular oxygen is considered as the most promising choice from the perspective of Green Chemistry, which is inexpensive, readily available, and environmentally benign with harmless water as the only by-product. In current industrial process, the oxidation of cyclohexane is conducted at 150-170°C and 1.0-2.0 MPa pressure using homogeneous cobalt salt as catalyst and molecular oxygen as oxidant, and in order to improve the selectivity of desired products (cyclohexanol and cyclohexanone), the conversion of cyclohexane is usually kept at 3%-8% with an acceptable selectivity towards cyclohexanol and cyclohexanone, 80%-85% [12,18,47,[75][76][77][78]. The main drawbacks of the current industrial process are the high temperature, low conversion, low selectivity and low yield, especially the high temperature which induces the oxidation of cyclohexane to process through uncatalyzed and unselective free radical autoxidation pathways, resulting in the low selectivity [75].…”