Highly dispersed palladium nanoparticles on mesocellular foam: An efficient and recyclable heterogeneous catalyst for alcohol oxidation

摘要

The preparation of palladium nanoparticles in mesocellular foam(MCF) was reported and these nanoparticles were demonstrated as excellent catalyst for racemization of amines. Palladium was immobilized on siliceous mesocellular foam(MCF) through the use of amine ligands. The Pd 3d core level was deconvoluted into two spin-orbit split components found at 335.5 and 338.2 eV binding energy. From the results with the benzylic substrates, it is we found that the overall presence of substituents on the phenyl ring affects the course of the reaction. The turnover number(TON) based on palladium approaches 135 000 with a high turnover frequency(TOF) of 3750 h -1. The Pd catalyst does not need any additives or extra base, and is able to efficiently catalyze alcohol oxidation under an air atmosphere.