The selective oxidation of D-glucose to D-gluconic acid was performed at both controlled (7-9.5) and free pH values in an aqueous solution in the presence of a gold on carbon catalyst using dioxygen as the oxidant under mild conditions (323-373 K, pO(2) = 100-300 kPa). No isomerization of glucose to fructose was observed during the reaction, and total selectivity to D-gluconate was obtained. A comparative study of gold and commercial palladium and platinum-derived catalysts highlighted the unique property of supported gold, i.e., it is active at low pH (2.5), whereas at a buffered higher pH (9.5), gold and bismuth-doped platinum-palladium on carbon catalysts show comparable selectivity, though gold has a higher activity, Moreover, upon recycling, gold is more stable toward deactivation, although this also depends on the operative pH. (C) 2002 Elsevier Science (USA).
Selective oxidation of D-glucose on gold catalyst / S. Biella, L. Prati, M. Rossi. - In: JOURNAL OF CATALYSIS. - ISSN 0021-9517. - 206:2(2002), pp. 242-247.
Selective oxidation of D-glucose on gold catalyst
L. PratiSecondo
;M. RossiUltimo
2002
Abstract
The selective oxidation of D-glucose to D-gluconic acid was performed at both controlled (7-9.5) and free pH values in an aqueous solution in the presence of a gold on carbon catalyst using dioxygen as the oxidant under mild conditions (323-373 K, pO(2) = 100-300 kPa). No isomerization of glucose to fructose was observed during the reaction, and total selectivity to D-gluconate was obtained. A comparative study of gold and commercial palladium and platinum-derived catalysts highlighted the unique property of supported gold, i.e., it is active at low pH (2.5), whereas at a buffered higher pH (9.5), gold and bismuth-doped platinum-palladium on carbon catalysts show comparable selectivity, though gold has a higher activity, Moreover, upon recycling, gold is more stable toward deactivation, although this also depends on the operative pH. (C) 2002 Elsevier Science (USA).Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.