Catalytic hydrogenation of pyrene over Mo-doped NiC/Al-MCM-41
Supported NiC/Al-MCM-41 and NiMoC/Al-MCM-41 catalysts were prepared by hydrothermal synthesis and utilized in pyrene hydrogenation.The catalysts were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM),N2 physical adsorption,NH3 temperature-programmed desorption(NH3-TPD),and thermogravimetric analysis(TG).The hydrogenation activity of the catalysts was evaluated in a batch high-pressure reactor.The effects of Mo doping on the physical-chemical structure and hydrogenation activity of NiC/Al-MCM-41 catalyst were investigated,and the structure-activity relationship between the physical and chemical properties of the catalyst and hydrogenation activity was explored.The results showed that the NiMoC/Al-MCM-41 catalyst exhibited the best hydrogenation activity and could be partially regenerated at a reaction temperature of 340℃,H2 pressure of 6MPa,and continuous reaction for 2h.Compared with NiC/Al-MCM-41 catalyst,Mo doping increased the conversion of pyrene from 65.2%to 90.8%and deep hydrogenation selectivity from 58.9%to 76.2%,which effectively improved the hydrogenation performance of the catalyst.However,the stability of NiMoC/Al-MCM-41 catalyst was poor due to the carbon deposition caused by pore channel blocking of the catalyst,which hindered the diffusion and transfer of pyrene molecules in the pore channels.Therefore,the catalyst resistance to carbon deposition should be further improved in the future.
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