采用湿浸渍法制备了Ni/Nb₂O₅催化剂,并探究了温度、时间和氢气压力对其催化苯酚加氢脱氧的影响。为进一步增强催化剂的脱氧性能,引入第二金属组分Mo制备了不同Ni、Mo摩尔比的NiMo双金属催化剂,并应用于催化苯酚加氢脱氧反应中。利用XRD、SEM、XPS、H₂-TPR、NH₃-TPD等手段对催化剂进行了表征分析。结果表明,Ni₅Mo₁/Nb₂O₅催化剂表现出最佳的加氢脱氧性能,主要是因为Mo的掺杂形成的NiMo合金促进了NiMo团簇的高分散性。此外,Mo的掺杂增加了催化剂的中强酸性位点,环己烷选择性增大。在240℃、4 h、3 MPa H₂的反应条件下,Ni₅Mo₁/Nb₂O₅催化剂表现出最佳的环己烷选择性。

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.Ni₅Mo₁/Nb₂O₅ catalyst exhibits the best cyclohexane selectivity under the reaction conditions of 240℃,4 h,and 3 MPa H₂.

黄靖涵(1998-),女,硕士生,主要从事生物质能源高值化利用,878678392@qq.com;薛渊(1991-),男,博士,副教授,研究方向为城市固体废弃物资源化及处理、异质催化下的快速热解及二氧化碳转化,通讯联系人,yuan.xue@sjtu.edu.cn。