Metallic nanoparticles have received attention to the field of catalysis because they can catalyze many organic reactions effectively due to their high ratio of surface area to volume .However, these naked nanoparticles tend to be aggregate to form bigger metal particles regard to the impulse of high surface energy, resulting in a decreasing in catalytic activity. A practical method to prevent agglomeration is to immobilize the metallic nanoparticles on suitable supports, and many methods have been developed for this purpose.In this project,initially supported Pd nanoparticles on the surface of acac(acetylacetone) functionalized silica gel, is prepared,the catalyst was characterized by a combination of XRD, XPS, FE-SEM, SEM/EDX and TEM. Since catalytic carbon-carbon coupling reactions are extensively employed in both the academic and industrial, catalytic application of this catalyst for coupling reaction such as Heck, Suzuki and homocoupl ing reactionwas investigated. For doing these reactions several reaction parameters, including type and amount of solvent and base and amount of catalyst were evaluated. Supported Pd nanoparticles were demonstrated to be an active and reusablecatalystin these reactions.The heterogeneity of the catalytic system was investigated using hot-filtration test and catalyst poisoning, indicating that there is a slight Pd leaching into the reaction solution under the applied conditions for heck and homocoupling reactions.Despite this metal leaching, the catalyst can be reused for ten times without significant loosing of catalyst activity. In fact these reactioroceed homogeneously with dissolved active palladium species that are formed through coordination of NMP with palladiumimmobilize on support, in highe temperature. However, this action was not performed in Suzuki reaction because of low temperature and lack of strong coordinated solvent such as NMP and DMF. Thus, we concluded that the catalyst act as a quasi-homogeneous catalyst in heck and homocoupling reactions.