Exploratory Catalyst Screening Studies on the Base Free Conversion of Glycerol to Lactic Acid and Glyceric Acid in Water Using Bimetallic Au–Pt Nanoparticles on Acidic Zeolites
The base free oxidation of glycerol with molecular oxygen in water using bimetallic Au–Pt catalysts on three different acidic zeolite supports (H-mordenite, H-β and H-USY) was explored in a batch setup. At temperatures between 140 and 180 °C, lactic acid formation was significant and highest selectivity (60 % lactic acid at 80 % glycerol conversion) was obtained using Au–Pt/USY-600 (180 °C). A selectivity switch to glyceric acid (GLYA) was observed when the reactions were performed at 100 °C. Highest conversion and selectivity towards GLYA were obtained with Au–Pt/H-β as the catalyst (68 % selectivity at 68 % conversion).
KeywordsGold catalysts Glycerol Lactic acid Zeolites Oxidation
The authors would like to thank NWO-ASPECT (The Netherlands) for financial support (ASPECT-project 053.62.020). Gert ten Brink and J. van der Velde (Faculty of Mathetatics and Natural science, University of Groningen) are acknowledged for the TEM and ICP-OES mesurements respectively. PQ-zeolyst is acknowledged for kindly supplying the commercial zeolites.
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