Influence of the pretreatment conditions on the performances of CeO2-supported gold catalysts in the catalytic wet air oxidation of carboxylic acids
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Well-dispersed Au/CeO2 catalysts were prepared by deposition–precipitation with urea. ► Reduction of the gold phase is crucial for the activity in the CWAO reaction. ► A synergetic effect between gold and ceria was evidenced. ► Au/CeO2 catalysts performed better than TiO2 or ZrO2-supported Pt or Ru catalysts.
Journal: Catalysis Communications - Volume 16, Issue 1, 30 November 2011, Pages 98–102