Abstract
Transition metal catalysts M-N-C (M = Co, Fe, Mn) were synthesized by a template-free method by heating meso-tetraphenyl porphyrins (i.e. CoTPP, FeTPPCl, MnTPPCl) precursors. The catalysts were characterized by N2 adsorption-desorption, thermogravimetry, high-resolution transmission electron microscopy, and Raman and X-ray photoelectron spectroscopy. The selective oxidation of ethylbenzene with molecular oxygen under a solvent-free condition was carried out to explore the catalytic performance of the M-N-Cs, which exhibited different catalytic performance. That was ascribed to the difference in M (Co, Fe, Mn) and different graphitization degree forming during the heating process, in which M (Co, Fe, Mn) might have different catalytic activity on the formation of the M-N-C catalyst. All the M-N-C composites had remarkable recyclability in the selective oxidation of ethylbenzene.
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