Abstract
In this work, Fe3O4/SiO2 nanoparticles were synthesized according to the literature and characterized by transmission electron microscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis and vibrating sample magnetometer. The catalytic properties of the Fe3O4/SiO2 catalyst have been tested in the epoxidation of different cyclic and acyclic alkenes with m-chloroperbenzoic acid (oxidizing agent). Under optimized conditions, all reactions afforded the desired products in good to excellent yields. Furthermore, the effect of different additives such as pyridine N-oxide and N-methylmorpholine-N-oxide was tested on the conversion of alkenes, but in all cases additives did not improve epoxidation yields. As a result, the Fe3O4/SiO2 showed good activity and super stability in the epoxidation of various olefins. Moreover, this catalyst can be recovered by using a magnetic field and recycled for several times without a significant loss in the catalytic activity.
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