Abstract
The search for sustainable catalytic oxidation processes remains a challenge. One process of utmost industrial and economic importance is the selective oxidation of cyclohexane, in the route of nylon-6,6 production, which requires urgent improvement. Herein, Au nanotriangles (Au NTs) were prepared following a three-step (seed preparation, growth and shaping) procedure and applied, for the first time, as catalysts for the selective oxidation of neat cyclohexane to ketone and alcohol (KA) oil (cyclohexanol and cyclohexanone mixture). The Au NTs successfully yield KA oil (up to 14%) under mild conditions (50 °C), using an alternative energy source (microwave irradiation) as reaction promotor.
Highlights
Studies on the catalytic properties of gold nanostructures in oxidation reactions showed that such nanoparticles stabilized and well dispersed on various supports are able to successfully catalyze several oxidation reactions, as well as the selective partial oxidation of cyclohexane.The preference for cyclohexane as a model substrate arises from the significance of the oxidized products in the production of adipic acid, a building block for different processes in the pharmaceutical, chemical, and food industries
The above cetyltrimethylammonium chloride (CTAC)-stabilized Au nanotriangles (Au NTs) were tested for the microwave (MW)-assisted oxidation of neat cyclohexane to ketone and alcohol (KA) oil under mild conditions using a “green” oxidant, in contrast to the current inefficient industrial harsher conditions [18,24]
Cetyltrimethylammonium chloride-stabilized gold nanotriangles (CTAC-stabilized Au NTs) were synthetized following a three-step procedure previously described in the literature [23]
Summary
Studies on the catalytic properties of gold nanostructures in oxidation reactions showed that such nanoparticles stabilized and well dispersed on various supports (metal oxides [1,2,3,4,5,6], carbon materials [7,8,9,10,11,12], metal–organic frameworks [13], zeolites [14], modified aluminums [15,16], ionic liquids [17], etc.) are able to successfully catalyze several oxidation reactions, as well as the selective partial oxidation of cyclohexane. The above CTAC-stabilized Au NTs were tested for the microwave (MW)-assisted oxidation of neat cyclohexane to ketone and alcohol (KA) oil under mild conditions using a “green” oxidant (aqueous tert-butylhydroperoxide, TBHP), in contrast to the current inefficient industrial harsher conditions [18,24]. To our knowledge, this is the first time that the successful use of Au NTs for the oxidation of cyclohexane is disclosed
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