PREPARATION, CHARACTERIZATION AND APPLICATION OF CARBON-SUPPORTED GOLD CATALYST

摘要

An C catalyst used for the liquid phase selective oxidation of D-glucose to D-gluconate was prepared by gold sol method that includes the preparation of metallic colloid by citrate reduction and subsequent immersion by carbon support. The influence of gold particle sizes and citrate protective layer of bounding gold particles on the activity of Au/C catalyst was studied. The results show that the Au/C catalyst with a mean gold particle diameter of 9.87 nm and narrow size distributions has very high activity. After 16 runs, the conversion of glucose selective oxidation can still achieve over 96% under mild reaction conditions. According to XRD and XPS, the nature of the active species led to the highly catalytic activity was revealed. In addition, 1% Au/C catalyst prepared in the present paper obviously has the advantage over commercial 5% Pd/C catalyst for the selective oxidation of glucose to gluconate.