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
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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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