▎ 摘　　要

A multi-layered catalyst based on poly(imidazole/imidazolium) and graphene oxide, with high loading capacity for immobilization of palladium nanoparticles was prepared. The catalyst was proven to be highly efficient for reduction of nitroarenes and also for Heck reaction with the use of only 0.1 mol% of the catalyst. The reduction of nitroarenes and Heck reaction were performed in water medium and excellent yields of products were achieved. The synthesized catalyst was readily recovered and reused for up to 10 subsequent runs without significant loss of activity. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.