Selective oxidation of glucose versus CO oxidation over supported gold catalysts
Two series of gold catalysts supported on TiO2, SiO2, and CeO2 have been prepared by colloidal gold deposition with 2 wt% of nominal gold loading. The diameter of gold particle stabilized by polyvinylalcohol (PVA) or by tannic acid-citrate was 2–3 nm and 6–7 nm, which increased to 5–7 nm and 7–13 nm, respectively, after calcination in air. Catalytic activities were investigated and compared in CO oxidation and glucose oxidation reactions. Inverse correlation was found between the activities in glucose oxidation and CO oxidation suggesting that the mechanisms are different. Besides the high dispersion the nature of the support seems to play a significant role in the liquid phase reaction.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideResearch highlights▶ Inverse correlation between the activities in glucose oxidation and CO oxidation. ▶ Support effect is more significant than small gold particle size in glucose oxidation. ▶ Weak metal–support interaction favors the activity in glucose oxidation.
Journal: Applied Catalysis A: General - Volume 388, Issues 1–2, 20 November 2010, Pages 31–36