This talk will present our recent work in the synthesis of Pt catalysts for the hydrogenation of acetophenone in aqueous phase.A facile but efficient seed-mediated method has been developed for the synthesis of porous platinum(Pt)nanostructures with size ranging from around 10 to 200 nm in diameter in aqueous solution at 55℃.Specifically,each porous Pt nanostructure is composed of a number of tiny Pt nanocrystals with diameter of~7 nm.The crystalline structure and formation/growth mechanisms have been investigated.The obtained porous Pt nanostructures exhibited excellent catalytic performance and stability for aqueous hydrogenation of acetophenone,a promising solvent-free process for emerging green chemistry.This reaction was found to reach 100%conversion more rapidly as the particle size decreased from 46 to 10nm while the size of the nanoparticle was found to have no significant effect on the selectivity of the reaction.Interestingly,the yield of the target alcohol can be well controlled by variation in the the reaction temperatures.It initially increased from 48.5%at room temperature to 89.7%at 80°C but then decreased to 64.3%at 120℃.This work may offer a green-chemistry method for designing and constructing metallic catalysts with a high performance for potential applications in biomass chemical conversion.