Highly efficient room-temperature oxidation of cyclohexene and d-glucose over nanogold Au/SiO2 in water

• Published in: Journal of catalysis 2012-11, Vol.295, p.15-21
• Main Authors: Bujak, Piotr, Bartczak, Piotr, Polanski, Jaroslaw
• Format: Article
• Language: English
• Subjects: ambient temperature; Au nanoparticles; Catalysis; Catalysts; Catalytic oxidation; Chemical reactions; Chemistry; Colloidal state and disperse state; Cyclohexene; cyclohexenes; d-Glucose; Exact sciences and technology; General and physical chemistry; glucose; Gold; Hydrogen peroxide; nanogold; Nanoparticles; oxidation; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Selective oxidation; Silica; Surfactants; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; ultrasonics; Water; wettability
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2012.06.023

Silica-supported nanogold catalysts suspended in 30% hydrogen peroxide using ultrasound are highly active and selective for cyclohexene and d-glucose oxidation at room temperature. [Display omitted] ► Au/SiO2 catalysts suspended in 30% hydrogen peroxide using ultrasound. ► Cyclohexene oxidized with 67.6% conversion at 80°C. ► Cyclohexene oxidized with 55.0% conversion at room temperature. ► Oxidation of d-glucose to d-gluconic acid with 100% conversion in 15min. Silica-supported nanogold catalysts suspended in 30% hydrogen peroxide using ultrasound are highly active and selective for cyclohexene and d-glucose oxidation at room temperature. In these conditions a polar reactant, D-glucose, can be efficiently and directly converted with 100% yield using this system, while a conversion of apolar cyclohexene is limited by the addition of a surfactant improving cosolubility in the system and/or catalyst/support wettability. To our best knowledge this is the first time that hydrogen peroxide has been used efficiently in association with a gold catalyst for the selective oxidation of cyclohexene in a biphasic system.