Synthesis and application of palladium stearates as precursors for the preparation of palladium nanoparticles

Abstract

This report successfully demonstrates the synthesis and application of palladium stearates. It was found that the branching of the carboxylate anion of metal precursors could influence the size and shape of palladium nanoparticles (PdNPs). Worm‐like nanowires were formed when using the branched isomer palladium isostearate (PdISt 2 ), while triangular nanoparticles were produced in a majority when using the normal form: palladium stearate (PdSt 2 ). Furthermore, when applying CO 2 to the system, both types of PdNPs transformed into more spherical shapes with smaller sizes. The formation of carbamates from the amine stabilizer with CO 2 could prevent the further growth and aggregation of PdNPs. The PdNPs were tested as catalysts for the hydrogenation of styrene, and higher catalytic activities were achieved with PdNPs that were prepared with the assistance of CO 2 . Copyright © 2012 John Wiley & Sons, Ltd.