CeO 2 @SiO 2 core−shell nanoparticles were prepared by microemulsion method, and metalloporphyrins were immobilized on the CeO 2 @SiO 2 core−shell nanoparticles surface via amide bond. The supported metalloporphyrin catalysts were characterized by N 2 adsorption−desorption isotherm (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet and visible spectroscopy (UV-Vis), and Fourier transform infrared spectroscopy (FT-IR). The results show that the morphology of CeO 2 @SiO 2 nanoparticles is core−shell microspheres with about 30 nm in diameter, and metalloporphyrins are immobilized on the CeO 2 @SiO 2 core−shell nanoparticles via amide bond. Especially, the core−shell structure contains multi CeO 2 core and thin SiO 2 shell, which may benefit the synergistic effect between the CeO 2 core and the porphyrin anchored on the very thin SiO 2 shell. As a result, this supported metalloporphyrin catalysts present comparably high catalytic activity and stability for oxidation of ethylbenzene with molecular oxygen, namely, ethylbenzene conversion remains around 12% with identical selectivity of about 80% for acetophenone even after six-times reuse of the catalyst.
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