FeO_x/HZSM－5催化剂上苯与氯苄苄基化反应动力学及催化剂的表征  

Kinetics of Benzylation of Benzene with Benzyl Chloride on FeO_x/HZSM-5 Catalysts and the Catalyst Characterization

作　　者：林涛[1] 张昕[1] 李蓉[1] 张贵泉[1] 龚婷[1] 祁敏[1] 

机构地区：[1]西北大学化工学院,陕西西安710069

出　　处：《石油化工》2011年第5期492-498,共7页Petrochemical Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-10-878);教育部博士点新教师基金项目(20096101120018);教育部留学回国人员科研启动基金项目(2009);陕西省"13115"创新工程重大科技专项项目(2009ZDKG-70);陕西省教育厅科技专项项目(09JK793);西北大学科研启动基金项目(PR09005);西北大学研究生实验资助项目(10YSY08);固体表面物理化学国家重点实验室开放基金项目(2009)

摘　　要：采用浸渍法制备了不同Fe负载量的FeOx/HZSM-5催化剂,用于催化苯与氯苄苄基化反应。考察了FeOx/HZSM-5催化剂的催化性能并得到了反应动力学参数。采用XRD、N2等温吸附-脱附和UV-Vis等手段对FeOx/HZSM-5催化剂进行了表征。实验结果表明,Fe负载量(质量分数)为8.0%的8.0-FeOx/HZSM-5催化剂对苯与氯苄苄基化反应有较好的催化性能;Fe负载量影响FeOx/HZSM-5催化剂上铁物种的结构和性质,当Fe负载量小于等于5.0%时,FeOx/HZSM-5催化剂上铁物种主要是"分立"的Fe3+物种;当Fe负载量大于等于8.0%时,催化剂上铁物种主要是"分立"的Fe3+物种和少量超细Fe2O3,由于"分立"的Fe3+物种和超细Fe2O3协同作用,使8.0-FeOx/HZSM-5催化剂的性能较佳。FeOx/HZSM -5 catalysts with different Fe loading were prepared by impregnation and used in benzylation of benzene with benzyl chloride. The catalysts were characterized by means of powder X-ray diffraction, N2 isothermal adsorption-desorption and UV-Vis spectrometry. The reaction kinetics of the benzylation on the catalysts was investigated and the kinetic parameters were obtained. Fe loading affected the structures and properties of Fe species on the FeOx/HZSM-5 catalysts. Isolated Fe3＋ was main iron species on the FeOx/HZSM-5 catalysts with the Fe loading （w） was not more than 5.0%. Both the isolated Fe3＋ species and the superfine Fe2O3 existed on the FeOx/HZSM-5 catalysts with the Fe loading was not less than 8.0%. The catalytic performance of 8.0-FeOx/HZSM-5 catalyst （8.0% of Fe loading） in the benzylation was the highest among the all investigated catalysts, which was due to the synergetic catalysis of the isolated Fe3＋ species and the superfine Fe2O3 on this catalysts.

关 键 词：苄基化反应 苯 氯苄 反应动力学 协同催化 FeOx/HZSM-5催化剂 

分 类 号：TQ426[化学工程]