Abstract
Oxidation of a mixture of glucose and arabinose over Au particles deposited on porous carbons, N-doped carbons and carbon nitrides was investigated at 70 °C, under constant pH of 8, and oxygen partial pressure 0.125 atm. In particular, Au deposited on nitrogen-containing carbon-based mesoporous structures demonstrated activity in the oxidation of the sugars to the corresponding aldonic acids higher than gold deposited on undoped carbon supports (conversion of glucose up to ca. 60%, arabinose–ca. 30% after 200 min). The results can be explained by the basic nature of the supports leading to an increase in the polarity of the carbon surface and the oxygen activation. Glucuronic acid (with selectivity ca. 10–93.5%) together with gluconic acid was formed as a result of glucose oxidation, while arabinose was selectively oxidized to arabinonic acid.
Highlights
Gold nanoparticles deposited onto various porous supports afford high activity and selectivity in low-temperature oxidation of CO, carbohydrates and aldehydes [1,2,3,4,5,6]
The aim of the current paper was to investigate the oxidation of model glucose and arabinose mixtures over gold nanoparticles supported on N-doped carbons and carbon nitrides
Oxidation of a mixture of glucose and arabinose over gold particles supported on porous carbon materials, N-doped carbons and carbon nitrides was studied
Summary
Gold nanoparticles deposited onto various porous supports afford high activity and selectivity in low-temperature oxidation of CO, carbohydrates and aldehydes [1,2,3,4,5,6]. They are characterized by a superior durability, being highly resisted to deactivation. Such deactivation is typically provoked by over-oxidation and corresponding poisoning (by the reaction products, i.e., aldonic acids) of the catalytically active metal phase [7]. Au particles of ca. 2.5 nm exhibit the highest catalytic performance in arabinose oxidation [9]
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