Influence of the pretreatment conditions on the performances of CeO2-supported gold catalysts in the catalytic wet air oxidation of carboxylic acids

摘要

Two series of ceria-supported gold catalysts (1 and 4 wt.% Au) were prepared by deposition-precipitation with urea. Depending on the gold loading, the pretreatment of the Au/CeO2 catalysts (calcination in air vs. reduction in hydrogen) had a great influence on the oxidation state of gold, and in turn, on the activity of the Au/CeO2 catalysts in the catalytic wet air oxidation (CWAO) of model carboxylic acids. The higher the fraction in metallic gold is, the better the catalytic performances are.