A8 超音波還元法による貴金属・磁性体ナノコンポジットの調製

抄録

Noble metal particles were successfully immobilized on the surface of magnetic γ-Fe_2O_3 nanoparticles by the sonochemical reduction method. Morphologies of the formed composite nanoparticles were investigated by TEM. The supported nanoparticles were single-nano size, and the sizes and the numbers of supported nanoparticles depended upon the type of stabilizer. The obtained Pd/γ-Fe_2O_3 composite nanoparticles showed catalytic, activity for Heck reaction, cross coupling of acrylic acid with iode benzene. However, in the second run of the catalyst, the composite nanoparticles did not show activity. This is probably due to the exfoliation of palladium nanoparticles from the surface of γ-Fe_2O_3.