One-Pot Synthesis of Pd Nanoparticle Catalysts Supported on N-Doped Carbon and Application in the Domino Carbonylation

Abstract

In this work, we report a novel and facile procedure for a one-pot preparation of palladium nanoparticle catalysts supported on porous N-doped carbon (Pd@CNT) by direct carbonization of palladium-N-heterocyclic carbene coordination polymer (P-Pd-NHC). This method could be conveniently extended to the synthesis of the Ni and alloy (PdxNiy) nanoparticle catalysts (Ni@CN800, PdxNiy@CN800). The treatment temperature played an important role on the growth and properties of the resultant M@CNT, wherein M@CN800 carbonized at 800 °C showed well-monodispersed metal nanoparticles (MNPs), graphene-like layers of the N-doped carbon supports, and strong interaction between MNPs and the support. Pd@CN800 displayed high efficiency and stable recyclability toward the domino carbonylative synthesis of pyrazole derivatives. Interestingly, its catalytic performance has been even higher than that of the representative PdCl2(PPh3)2 within six runs.