Fabrication and Characterization of Cu Nanoparticles Dispersed on ZnAl-Layered Double Hydroxide Nanocatalysts for the Oxidation of Cyclohexane

Abstract

In the chemical industry, designing high-performance catalysts for the oxidation of cyclohexane into value-added products such as cyclohexanol and cyclohexanone (the combination is known as KA oil) is critical. The catalytic activity of copper nanoparticles supported on layered double hydroxide (LDH) for the liquid phase oxidation of cyclohexane was examined in this study. In this work, we have developed Cu nanoparticles supported on layered double hydroxide nanocatalysts, abbreviated as CuNPs@LDH, by the chemical reduction approach. Various physical methods were used to characterize the resulting material, including ICP-AES, XRD, FTIR, SEM, EDX, HRTEM, and BET surface area. The catalytic activity of copper nanoparticles supported on LDH was examined for the liquid phase oxidation of cyclohexane with tert-butyl hydroperoxide. CuNPs@ LDH nanocatalysts with an excellent 52.3% conversion of cyclohexane with 97.2% selectivity of KA oil was obtained after 6 h at 353 K. The hot filtration test further indicated that CuNPs@LDH was a heterogeneous catalyst that could be recycled at least six times without suffering a substantial reduction in its catalytic activity.

CeO2–TiO2 Nanoparticle-Grafted gC3N4 Sheets as an Efficient Catalyst for the Oxidation of Cyclohexane to KA oil

“…56 Xu et al reported cyclohexane oxidation with honeycomb-like nanostructures with a N doping-supported bimetallic Ce−Cr oxide catalyst, and they have achieved 56.5% conversion with 95.5% selectivity to KA oil. 57 Wu et al conducted cyclohexane oxidation over bimetallic Au−Pt and Au−Pd supported on mesoporous silica, and they achieved cyclohexane conversion of 6% with 99% selectivity to KA oil. 58 Overall results suggest that the conversion of cyclohexane (62%) and KA oil selectivity (95%) achieved in the present study were higher than those of recent literature reports.…”

“…The cyclohexane oxidation reaction was performed by Han et al using graphene-supported CoO nanoparticles, and the process achieved 32% conversion and 75% KA oil selectivity . Xu et al reported cyclohexane oxidation with honeycomb-like nanostructures with a N doping-supported bimetallic Ce–Cr oxide catalyst, and they have achieved 56.5% conversion with 95.5% selectivity to KA oil . Wu et al conducted cyclohexane oxidation over bimetallic Au–Pt and Au–Pd supported on mesoporous silica, and they achieved cyclohexane conversion of 6% with 99% selectivity to KA oil .…”

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

“…LDHs can be used as an attractive base in various applications, such as medical, pharmaceutical, sensors, and drug delivery. As a result, they have attracted a lot of attention. − LDHs have a layered structure, which is also called hydrotalcite; it consists of divalent and trivalent cations, whose general formula is [Me 2+ (1 – x ) Me 3+ x (OH) 2 ] x +(An – ) x / n n •H 2 O. , It is possible to change cations and anions, which may affect the properties of the layers. Today, layered double hydroxides are excellent supports for various catalysts due to the numerous hydroxide groups on their surface. − …”

Coherent design of chromium oxide nanoparticles immobilized on layered double hydroxide as competent nanocatalyst for the oxidation of cyclohexane to KA oil

“…In a recent study, we reported that Cu and CeO 2 nanoparticles and Co Schiff base complexes were synthesized and immobilized on layered double hydroxide catalysts. Their catalytic activity has been investigated for the oxidation of cyclohexane and ethylbenzene [19][20][21].…”