Hβ分子筛负载非贵金属催化苯加氢烷基化制备环己基苯  

Preparation of Cyclohexylbenzene Based on Benzene Hydroalkylation Catalyzed by HβZeolite Supported Non-Noble Metals

作　　者：侯晓慧 薛常浩 孙伟杰 袁霞[1] HOU Xiaohui;XUE Changhao;SUN Weijie;YUAN Xia(School of Chemical Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《石油学报（石油加工）》2023年第2期340-348,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21776237)资助。

摘　　要：以Hβ酸性分子筛作为烷基化活性组分,负载非贵金属Ni、Co、Cu为加氢活性组分,制备一系列不同非贵金属负载量的双功能催化剂,采用N2物理吸附、CO脉冲吸附、NH_(3)-TPD、吡啶红外、TEM等手段对其进行表征,在苯加氢烷基化反应中筛选出适宜的非贵金属组分并考察金属负载量对催化剂反应性能的影响。结果表明:Ni、Co和Cu的负载使Hβ分子筛中强酸量减少并产生一定量的强酸中心,Ni/Hβ催化剂由于具有较多的B酸酸量更有利于苯加氢烷基化反应;在相同的条件下催化苯加氢烷基化反应,Cu/Hβ催化剂无催化活性,金属负载量相同的Ni/Hβ催化剂比Co/Hβ催化剂的催化活性高;在氢气压力2.5 MPa、反应温度200℃、反应时间3 h的条件下,2%Ni/Hβ催化剂作用下苯加氢烷基化反应的苯转化率为38.4%、环己基苯选择性为72.6%、环己烷选择性为5.8%、二环己基苯的选择性为8.9%。Using Hβacidic zeolite as alkylation active component,and non-noble metals Ni,Co and Cu supported by Hβzeolite as hydrogenation active components,a series of bifunctional catalysts differing in the loading of non-noble metals were prepared,and then characterized by means of N2physical adsorption,CO pulse adsorption,NH_(3)-TPD,Pyridine-IR and TEM.Suitable non-noble metal components were screened out in benzene hydroalkylation reaction,and the effect of metal loading on catalytic performance was also investigated.The results show that the loading of Ni,Co and Cu can reduce the amount of middle strong acid in Hβzeolite and produce a certain amount of strong acid centers;Ni/Hβcatalyst is more favorable for benzene hydroalkylation thanks to its higher amount of B acid;when used to catalyze the benzene hydroalkylation reaction under the same conditions,Cu/Hβcatalyst shows no catalytic activity,and Ni/Hβcatalyst boasts higher catalytic efficiency than Co/Hβcatalyst with the same metal loading amount;At the hydrogen pressure of 2.5 MPa,reaction temperature of 200℃,and reaction time of 3 h,the benzene conversion rate is 38.4%,and the selectivity of cyclohexylbenzene,cyclohexane and dicyclohexyl benzene are respectively 72.6%,5.8%and 8.9%in benzene hydroalkylation reaction under the action of 2%Ni/Hβcatalyst.

关 键 词：HΒ分子筛 非贵金属 苯 加氢烷基化 环己基苯 

分 类 号：TQ241.1[化学工程—有机化工]