Pd nanoparticles immobilized on the poly-dopamine decorated halloysite nanotubes hybridized with N-doped porous carbon monolayer: A versatile catalyst for promoting Pd catalyzed reactions

A hybrid catalyst, Pd@Hal-pDA-NPC, with the utility for promoting both C-C coupling reactions (Sonogashira, Heck and Suzuki reactions) and hydrogenation of nitrocompounds is prepared through two main steps. First, Pd(0) nanoparticles was immobilized on the poly-dopamine decorated halloysite nanotubes (Hal-pDA) and then Pd@Hal-pDA was hybridized with the layers of a novel multi-N-doped porous carbon monolayer derived from 4,4',4 ''-((1,3,5-triazine-2,4,6-triy1)tris(azanediy1))tribenzonitrile.The results established that the catalyst could catalyze all the reactions efficiently under mild reaction condition. Moreover Pd@Hal-pDA-NPC exhibited high recyclability (up to ten reaction runs). Using various control catalysts, precise stuy was performed to elucidate the role of NPC and p-DA in the catalysis and suppressing Pd leaching. The results confirmed that both NPC and p-DA could improve Pd loading, while supress its leaching. Moreover, it was proved that incorporation of NPC was more effective than graphitic carbon nitride, g-G(3)N(4), and grapheme oxide, GO. (C) 2018 Elsevier Inc. All rights reserved.