Preparation of Pt/SWNTs for heterogeneous asymmetric hydrogenation of ethyl pyruvate

In order to be applied in heterogeneous asymmetric hydrogenation, a series of Single-Walled Carbon Nanotubes (SWNTs)-supported Pt nanoparticle catalysts with different controlled Pt loadings, i.e. 5%, 10% and 20%, were prepared, and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). By modification with (-)-cinchonidine (Cd), these Pt/SWNTs catalysts were found to be efficient for the asymmetric hydrogenation of ethyl pyruvate, providing (R)-ethyl lactate in high activity and moderate enantioselectivity. Kinetic study showed that the PT/SWNTs-catalyzed asymmetric hydrogenation of ethyl pyruvate was a ligand-accelerated reaction. (C) 2007 Elsevier B.V. All rights reserved.