| Abstract |
Heterometallic double Fe2O3-CoCl2, CoCl2-V2O5, MoO3-V2O5, and triple CuO-Fe2O3-CoCl2 3d metal dispersed systems were easily prepared by ball milling at room temperature and characterized by scanning electron microscopy (SEM), field emission gun scanning electron microscopy (FEGSEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). They catalyze the microwave-assisted solvent-free heterogeneous oxidation of 1-phenylethanol to acetophenone with tert-butyl hydroperoxide (t-BuOOH) as oxidant, used as a model reaction. In most of the heterometallic systems a significant improvement in the catalytic activity was observed in comparison to homometallic ones. For the tested catalytic systems and experimental conditions, the CuO-Fe2O3-CoCl2 and Fe2O3-CoCl2 systems exhibit the highest activity with maximum 78\% yield and TON 39 after 1 h. The possibility of magnetic recovery of the catalysts was demonstrated for the Fe2O3-CoCL2 (3:1) system. (C) 2016 Elsevier B.V. All rights reserved. |
