摘要：

Lanthanum-promoted Ni-Mo-B amorphous catalysts were prepared by chemical reduction of the corresponding metal salts with sodium borohydride aqueous solution.Scanning electron microscopy(SEM),X-ray diffraction(XRD),inductively coupled plasma atomic emission spectrometry(ICP-AES),and X-ray photoelectron spectroscopy(XPS)were used to characterize the resulting materials.Phenol was used as model compound to test the hydrodeoxygenation(HDO)activity of the La-Ni-Mo-B amorphous catalysts.Adding lanthanum could decrease the particle size,increase the content of Ni 0 and promote the reduction of Mo 6+ to Mo 4+.But excess lanthanum would cover some of the Ni 0,and Mo 4+ active sites.The high hydrogenation activity was attributed to the amorphous structure of the catalyst and the high content of Ni 0 and the high degree of deoxygenation was attributed to the high content of MoO 2.The HDO reation of phenol on the La-Ni-Mo-B amorphous catalyst proceeded with a hydrogenation-dehydration route,thus decreasing the aromatic content of the HDO products.Both the conversion and the total deoxygenation degree were up to 99.0%.The deactivation of the La-Ni-Mo-B amorphous catalysts during the HDO reation of phenol at high temperature was mainly caused by the crystallization of the amorphous structure.

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