Facile Synthesis of Small Gold Nanoparticles Stabilized by Carbon Nanospheres for Selective Hydrogenation of 4-Nitrobenzaldehyde

摘要

We report the facile synthesis of small gold nanoparticles stabilized by carbon nanospheres(Au@C)for highly active and selective hydrogenation of 4-nitrobenzaldehyde.The formation of such a Au@C unique structure can be attributed to the high distribution of Au(III)species in the melamine-formaldehyde resin nanospheres,which were formed via the coordination of Au(III)with the abundant imino groups of melamine-formaldehyde pre-polymer.After the subsequent condensation and confined in situ reduction,small gold nanoparticles,and carbon nanospheres were formed simultaneously.Under the reaction conditions of 80 °C and 1.6 MPa,99.3% conversion and>99% selectivity were achieved for the hydrogenation of 4-nitrobenzaldehyde to 4-aminobenzaldehyde.