Study On Catalytic Performance Of Metal Tetrakis(P-Nitrophenyl)Porphyrin Supported On Graphene Oxide For Oxidization Of Ethylbenzene

For mimicking the catalytic performance of cytochrome P450 enzyme,and enhancing a reused catalytic efficiency of metal porphyrins,the metalloporphyrins were supported on graphene oxide(GO)via π-π stacking interaction,forming three biomimetic catalyst materials(Fe TNPP/GO,Co TNPP/GO and Mn TNPP/GO).The supported catalysts were used for catalytic oxidation of ethylbenzene with O2.And the mechanism of catalytic oxidation of ethylbenzene over the supported cataltsts was discussed.This paper content mainly include following research keypoints:1.Metalloporphyrin,GO and supported catalysts were synthesized.2.Three supported catalysts were characterized using Ultraviolet-visible(UV-Vis)spectra,UV-vis-diffuse reflectance(UV-DR)spectra,Fourier-transform infrared(FT-IR)spectra,Brunauer-Emmett-Teller surface areas(SBET),X-ray photoelectron spectroscopy(XPS),Scaning Electron Microscopy(SEM)and Thermogravimetric Analysis(TG)techniques.3.The optimum reaction conditions for the three immobilized metal porphyrins were determined via single factor variable method,and the reused catalysis for the supported catalysts were carried out under the optimal reaction conditions.The experimental data show that the three immobilized metal porphyrins could be used 8 times for the oxidation reaction of ethylbenzene,and had a stronger catalytic activity than the corresponding unsupported metalloporphyrins.The catalytic activity order of the three immobilized metal porphyrins was as following:Fe TNPP/GO>Co TNPP/GO>Mn TNPP/GO.4.According to the control experimenttals and the related literature,the reaction mechanism of the ethylbenzene oxidation catalyzed by graphene oxide supported metal tetrakis(p-nitrophenyl)porphyrins may be a free radical mechanism.