Catalytic conversion of glycerol to valuable chems. has been recognized as an attractive and challenging reaction in biorefinery. In this paper, we demonstrated that a combined catalyst of Pt nanoparticles and TiO2 worked as a highly active catalyst for the one-pot conversion of glycerol to lactic acid in water. The yield of lactic acid reached 63 % under oxygen atm. without the use of any additives such as strong bases, and the catalyst could be reused without significant loss of the catalytic performance. The mechanistic studies revealed that Pt nanoparticles on TiO2 selectively oxidized glycerol to C3 aldehyde/ketone, and Lewis acid sites on TiO2 smoothly promoted the dehydration and rehydration/rearrangement reactions of the intermediates to produce lactic acid efficiently. [on SciFinder(R)]
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