氧化铌负载镍钼催化木质素衍生酚类化合物制备环己烷的研究  

Hydrodeoxygenation of lignin-derived phenols over Nb2O5 supported NiMo catalyst to produce cyclohexane

作　　者：黄靖涵 符祝富 孙浩云 薛渊 HUANG Jing-han;FU Zhu-fu;SUN Hao-yun;XUE Yuan(China-UK Low Carbon College,Shanghai Jiao Tong University,Shanghai 201306,China)

机构地区：[1]上海交通大学中英国际低碳学院,上海201306

出　　处：《现代化工》2024年第10期94-98,共5页Modern Chemical Industry

基　　金：国家自然科学基金项目(52306261);上海市自然科学基金项目(22ZR1434200)。

摘　　要：采用湿浸渍法制备了Ni/Nb_(2)O_(5)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、H_(2)-TPR、NH_(3)-TPD等手段对催化剂进行了表征分析。结果表明,Ni_(5)Mo_(1)/Nb_(2)O_(5)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 H_(2)的反应条件下,Ni_(5)Mo_(1)/Nb_(2)O_(5)催化剂表现出最佳的环己烷选择性。Ni/Nb_(2)O_(5)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,H_(2)-TPR,and NH_(3)-TPD.Results indicate that Ni_(5)Mo_(1)/Nb_(2)O_(5)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.Ni_(5)Mo_(1)/Nb_(2)O_(5)catalyst exhibits the best cyclohexane selectivity under the reaction conditions of 240℃,4 h,and 3 MPa H_(2).

关 键 词：加氢脱氧 镍钼合金催化剂 氧化铌 苯酚 环己烷 

分 类 号：TQ35[化学工程]