正己烷在Zn/HZSM-5上芳构化反应机理的探讨  

An investigation on mechanism for aromatization of n-hexane on Zn/HZSM-5 catalyst

作　　者：尹双凤[1] 陈懿[2] 林洁[3] 于中伟[3] 

机构地区：[1]清华大学化学系一碳化工国家重点实验室,北京100084 [2]湖南中医学院,长沙410007 [3]石油化工科学研究院,北京100083

出　　处：《工业催化》2002年第1期33-37,共5页Industrial Catalysis

摘　　要：比较了正己烷在HZSM 5、Al2 O3和ZnO/Al2 O3催化剂上的反应性能 ,探讨了锌含量和水热处理对Zn/HZSM 5芳构化性能的影响。发现B酸是芳构化反应不可缺少的活性中心 ,Zn L因其氢解作用促进烃类的活化和脱氢 ,Al L酸只是对正己烷有较弱的活化作用。提出了正己烷在Zn/HZSM 5上的芳构化反应机理。The aromatization of n hexane over Al 2O 3, Zn/Al 2O 3 and HZSM 5 was compared. Influence of zinc content and hydrothermal treatment on aromatization properties of Zn/HZSM 5 was investigated. It was found that B acid is indispensable active centre for n hexane aromatization while Al L acid shows very weak activation to n hexane. Incorporation of zinc onto surface of HZSM 5 greatly enhances the its aromatization activity. When zinc content exceeds 1 8%, it has little effect on aromatization properties of Zn/HZSM 5. There exists synergistic interaction between B acid sites and Zn L acid sites on Zn/HZSM 5 catalyst, which is necessary to enhancement of aromatization performance of HZSM 5. Mechanism for n hexane aromatization on Zn/HZSM 5 catalyst is proposed on the basis of the experimental results.

关 键 词：Zn/HZSM-5催化剂 沸石 芳构化机理 正己烷 

分 类 号：TE624.48[石油与天然气工程—油气加工工程]