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).
|Titolo:||Selective oxidation of D-glucose on gold catalyst|
PRATI, LAURA (Secondo)
ROSSI, MICHELE (Ultimo)
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||2002|
|Digital Object Identifier (DOI):||10.1006/jcat.2001.3497|
|Appare nelle tipologie:||01 - Articolo su periodico|