Selective hydrogenation of α,β-unsaturated carbonyls into saturated carbonyls is important to obtain remunerative products.However,it is still a challenge to achieve high activity and selectivity under mild conditions.Herein,Pd,Ir and bimetallic Pd-lr nanoparticles were uniformly deposited with high dispersity on the surface of SiC by a facile impregnation method,respectively.The as-prepared Pd/SiC catalysts efficiently hydrogenate cinnamaldehyde to hydrocinnamaldehyde at room temperature and atmospheric pressure,and the activity of Pd/SiC is observed further enhanced by adding Ir component (conversion of 100％).In addition,the dependence of Pd-lr catalyst activity on Pd/Ir molar ratio confirms a synergistic effect between Ir and Pd,which originates from the electron transfer between Pd and Ir.