Influence of rare earth metal modification on hydrodesulfurization activity of supported Ni2P/M41 catalysts
It is an important way to achieve deep desulfurization of oil products for the development of efficient hydrodesulfu-rization(HDS)catalysts.A series of rare earth metals(Nd,La,Ce,Pr,Y)modified nickel phosphide catalysts(X-Ni2P/M41)were prepared by a temperature programmed reduction method.The structure and chemical composition of catalysts were analysed by X-ray diffraction(XRD),N2 adsorption-desorption,CO uptake and X-ray photoelectron spectroscopy(XPS).The effect of rare earth metals on the hydrodesulfurization performance of Ni2P/M41 catalyst was investigated by u-sing dibenzothiophene as a model compound.The results show that the rare earth metals can affect the distribution of Ni2P crystalline on the surface of M41 and promote the formation of the active Ni2P crystalline phase at different levels.La and Pr can significantly increase the HDS activity of supported Ni2P/M41 catalysts,while the addition of Nd,Ce,and Y could slightly reduces its activity.Especially,Pr-Ni2P/M41 presents the optimal HDS preformance.After 6h of reaction,its des-ulfurization conversion reaches 92.6％,which is 15.1％higher than that of the unmodified Ni2P/M41 catalyst.
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