反应条件对苯选择加氢制环己烯纳米Ru-Zn催化剂性能的影响  

Effects of Reaction Conditions on the Performance of Nano Ru-Zn Catalyst for Selective Hydrogenation of Benzene to Cyclohexene

作　　者：蔡文娟 宿晓云 孙海杰 陈凌霞 刘仲毅[2] 刘寿长[2] CAI Wenjuan;XIU Xiaoyun;SUN Haijie;CHEN Lingxia;LIU Zhongyi;LIU Shouchang(Institute of Environmental and Catalytic Engineering,Department of Chemistry,Zhengzhou Normal University,Zhengzhou 450044,China;College of Chemistry and Molecular Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州师范学院化学化工学院,环境与催化工程研究所,郑州450044 [2]郑州大学化学与分子工程学院,郑州450001

出　　处：《河南科学》2019年第10期1573-1578,共6页Henan Science

基　　金：国家自然科学基金（21273205,21543011）;河南省科技攻关重点项目（192102210139）;郑州师范学院环境催化科研创新团队（702010）;郑州师范学院大学生创新实验计划项目（DCZ2017014）;郑州市地方高校市级大学生创新创业训练计划建设项目资助

摘　　要：采用并流沉淀法制备纳米Ru-Zn催化剂,并考察了反应温度和预处理等反应条件对Ru-Zn催化剂催化苯选择性加氢制环己烯性能的影响.结果表明,制备的Ru-Zn催化剂Zn与Ru的物质的量比为0.15,催化剂粒径集中分布在3.4nm,比表面积为56m2/g.Ru主要以金属Ru存在,Zn主要以ZnO或Zn(OH)2存在.随反应温度的升高,Ru-Zn催化剂的活性逐渐升高,环己烯的选择性先升高后降低.Ru-Zn催化剂催化苯选择加氢制环己烯的最佳温度为140℃.反应物苯的反应级数为1,苯选择加氢反应的活化能为65.20kJ/mol.随预处理时间的增加,Ru-Zn催化剂的活性先逐渐降低后升高,环己烯选择性先升高后降低.预处理12h的Ru-Zn催化剂表面最适宜生成环己烯,环己烯收率达到了56.4%.而且Ru-Zn催化剂具有良好的重复使用性能和稳定性.The nano-Ru-Zn catalyst was prepared by a parallel precipitation method. The effects of reaction temperature and pretreatment conditions on the performance of Ru-Zn catalyst for the selective hydrogenation of benzene to cyclohexene were investigated. The results show that the prepared Ru-Zn catalyst has a ratio of Zn to Ru of 0.15,the catalyst particle size is concentrated at 3.4 nm,and the specific surface area is 56 m2/g. Ru mainly exists as metal Ru,and Zn is mainly present as ZnO or Zn(OH)2. With the increase of reaction temperature,the activity of Ru-Zn catalyst gradually increased,and the selectivity of cyclohexene increased first and then decreased. The optimum temperature for the selective hydrogenation of benzene to cyclohexene catalyzed by Ru-Zn catalyst is 140 ℃. The reaction benzene has a reaction order of 1,and the benzene selective hydrogenation reaction has an activation energy of 65.20 kJ/mol. With the increase of pretreatment time,the activity of Ru-Zn catalyst decreased first and then increased,and the selectivity of cyclohexene increased first and then decreased. The surface of the Ru-Zn catalyst pretreated for 12 h was most suitable for the formation of cyclohexene,and the yield of cyclohexene reached 56.4%.Moreover,the Ru-Zn catalyst has good reusability and stability.

关 键 词：苯 选择加氢 环己烯 钌 锌 预处理 

分 类 号：O643.3[理学—物理化学]