Ni/Nb2O5 catalyst is prepared through wet impregnation method,and applied to catalyze the hydrodeoxygenation of phenol.The influences of reaction temperature,time,and initial hydrogen pressure on the hydrodeoxygenation of phenol are investigated.In order to further enhance the deoxygenation performance of the catalyst,the second metal component Mo is added,and NiMo bimetallic catalysts with different Ni and Mo molar ratios are prepared,and applied to catalyze the hydrodeoxygenation of phenol.The catalysts prepared are characterized by means of XRD,SEM,XPS,H2-TPR,and NH3-TPD.Results indicate that Ni5Mo1/Nb2O5 catalyst exhibits the best hydrodeoxygenation performance,which can be attributed to that the doping of Mo in Ni forms NiMo alloy,promoting the high dispersion of NiMo clusters.In addition,the formation of NiMo alloy also increases the medium-strong acid sites of the catalyst,which in turn enhances the selectivity of cyclohexane.Ni5 Mo1/Nb2O5 catalyst exhibits the best cyclohexane selectivity under the reaction conditions of 240℃,4 h,and 3 MPa H2.
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