Influence of the Support and the Size of Gold Clusters on Catalytic Activity for Glucose Oxidation

Abstract

Nicht alles was glänzt …︁ Die Aktivität immobilisierter Gold‐Nanopartikel hängt von der Herstellungsmethode ab. Goldcluster mit 2 nm Durchmesser wurden auf nichtreduzierbaren Metalloxiden und Kohlenstoffmaterialien abgeschieden, indem ein fester flüchtiger Goldkomplex in einer Kugelmühle zermahlen und anschließend kalziniert wurde. So erzeugtes Au/ZrO2 und Au/Al2O3 sind extrem leistungsfähige Katalysatoren für die aerobe Oxidation von Glucose.

Catalytic transformation of cellulose into platform chemicals

“…Furthermore, Au/C catalyzed the selective oxidation even at pH 7, but the reaction was not promoted by Pd-Bi/C and Pt-Pd-Bi/C under the same conditions. They also showed that the Au particles catalyzed the reaction only when the particle size was smaller than 10 nm [121,122] Ni [128], and WC supported on mesoporous carbon produced 73% yield of EG with 100% conversion of cellulose [129]. The WC catalyst was reusable for 3 times.…”

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO2 composites

“…[11][12][13][14][15] Gold nanoparticles supported on activated carbon 16 or ZrO 2 (ref. 17) showed good catalytic activity for oxidation of glucose to gluconic acid at 50 C in the presence of O 2 at pH's ranging between 8 and 10. In this context, heterogeneous photocatalysis can be also considered as an alternative.…”

A simple semi sol-gel method for preparation of alumina monoliths with hierarchical pore structures

“…The highest efficiency of the oxidation process has been reported for reactions carried out in basic conditions with hydrogen peroxide as the oxidant [24]. Advantages of the catalytic route include simple catalyst manufacturing, no toxicity of the metal and the possibility to recycle the catalysts [24,27]. Furthermore, continuous production using functionalised alumina monoliths in a flow-through system would be very beneficial.…”

“…However, recent developments indicate that the catalytic route can be a viable alternative. Gold nanoparticles supported on alumina have been shown to exhibit high activity and almost 100% selectivity in the aqueous oxidation of glucose to gluconic acid [27]. The highest efficiency of the oxidation process has been reported for reactions carried out in basic conditions with hydrogen peroxide as the oxidant [24].…”