Abstract
Pt-Sn supported on reduced graphene oxide (Pt-Sn/rGO) was synthesized and characterized by SEM, EDX, and XRD. The catalytic activity of Pt-Sn/rGO was tested for the solvent free liquid phase oxidation of cyclohexane to a mixture of cyclohexanol and cyclohexanone, also called KA oil, under mild reaction conditions. The products were analyzed gravimetrically, by UV spectrophotometer, and GC equipped with FID. The catalyst was found to be fairly active as well as selective for the desired products. The experimental data was analyzed by Freundlich, Temkin, and Langmuir adsorption isotherms. The L-H model was found to give a better fit of the data. The catalyst was fully recyclable and truly heterogeneous.
Highlights
The catalytic oxidation of cyclohexane to KA oil (KA oil: cyclohexanol and cyclohexanone) is of immense significance as it has a broad range of industrial applications [1]
The modern industrial process for oxidation of cyclohexane to a mixture of cyclohexanol and cyclohexanone relies on a cobalt salt as a catalyst, a temperature range of 150 ̋ C–160 ̋ C, and pressure of air around about 1 atm under homogeneous reaction condition that results in the conversion of less than 6% and selectivity of cyclohexanol and cyclohexanone of around 80% [1]
This paper describes our study on the catalytic efficiency of Pt-Sn/rGO to selectively oxidize liquid C6 H6 to cyclohexanone and cyclohexanol by molecular oxygen, under mild reaction conditions
Summary
The catalytic oxidation of cyclohexane to KA oil (KA oil: cyclohexanol and cyclohexanone) is of immense significance as it has a broad range of industrial applications [1]. The addition of other homogeneous catalysts have been reported for the oxidation of cyclohexane, like transition metal salts containing Co2+ , Cr2+ or Mn2+ , metalloporphyrins, MoO3 , WO3 , and Cr2 O3 [6,7] When this process is carried out in the presence of anhydrous metaboric acid, 87%–90% selectivity of mixture of cyclohexanol and cyclohexanone at. Immobilizing various metal nanoparticles on graphene sheets can afford hybrid composites with admirable properties for a wide range of applications, including catalytic applications [18]. It can be seen from the literature that graphene has a great significance as a heterogeneous catalyst support. This paper describes our study on the catalytic efficiency of Pt-Sn/rGO to selectively oxidize liquid C6 H6 to cyclohexanone and cyclohexanol by molecular oxygen, under mild reaction conditions
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