Synthesis and characterization of nanoparticles of palladium-supported boehmite (Pd(0)-SMTU-boehmite) by using XRD, SEM, EDS, TGA, BET, ICP and FT-IR technics. Application of Pd(0)-SMTU-boehmite nanoparticles as a new catalyst for C-C coupling reactions of Suzuki-Miyaura and Mizoroki-Heck in PEG-400 solvent showed excellent and reusable activity. The study of palladium leaching by ICP-OES technique and hot filtration led to the catalyst exhibiting excellent stability and recyclability.