Hydroxy acetone and lactic acid synthesis from aqueous propylene glycol/hydrogen peroxide catalysis on Pd-black
Here we report the reaction of propylene glycol with hydrogen peroxide/air sparging on a Pd-black catalyst under reflux conditions at 368 K. Major products include hydroxy acetone (HA) and acetic acid (AA) compounds, whereas a lesser abundant compound formed was lactic acid (LA). Product conversion data at near neutral pH versus hydrogen peroxide equivalents added is presented. Experiments revealed that although the product distribution in air sparged versus non-air sparged chemistries is similar, the amount of reactive oxygen is greatly enhanced (∼8-fold) with co-addition of O2/H2O2. Additional studies have revealed the amount of LA formed can be enhanced under mildly acidic conditions such that 26% of total product formation is LA.
Journal: Catalysis Communications - Volume 9, Issue 13, 20 July 2008, Pages 2250–2252