燃料化学学报（中英文）2025，Vol.53Issue(9)：1354-1363,10.DOI:10.1016/S1872-5813(25)60557-3
反应温度对Zn改性HZSM-5分子筛催化乙烯芳构化性能的影响
Influence of temperature on the catalytic behaviors of Zn-containing HZSM-5 catalysts for ethylene aromatization
摘要
Abstract
Zn-modified HZSM-5 catalyst has been widely used in the aromatization of ethylene.The influence of reaction temperature on the ethylene aromatization process,catalyzed by HZSM-5 and various Zn-containing catalysts,is crucial for the design of efficient aromatization catalysts and optimization of process conditions.In this work,the structure,composition,and acid properties of various Zn-containing HZSM-5 catalysts prepared by ion exchange,impregnation,and physical mixing were analyzed by XRD,ICP,NH3-TPD and Py-FTIR,and tested in the ethylene aromatization at 400-580 ℃.The results indicated that,with reaction temperature increasing,the aromatics selectivity on HZSM-5 and ZnAl2O4-pure/HZSM-5 catalysts,as well as the aromatics produced by the dehydrogenation route,increased.On Zn(IE)/HZSM-5 and ZnAl1.5O/HZSM-5 catalysts,the aromatics selectivity increased rapidly and then remained basically unchanged.However,the aromatics selectivity increases at first and then remains basically unchanged,while the proportion of dehydrogenation route remains constant,on Zn(IM)/HZSM-5 and Zn(PM)/HZSM-5 catalysts.Combined with cyclohexane dehydrogenation kinetics experiments,it is confirmed that the introduction of Zn species is helpful in reducing the dehydrogenation activation energy.Furthermore,a linear relationship is observed between the dehydrogenation activation energy of the catalysts and its acid content.Interestingly,due to the absence of catalytic activity for spinel-structured ZnAl2O4,the catalytic performance and dehydrogenation activation energy of the ZnAl2O4-pure/HZSM-5 catalyst closely resemble those of HZSM-5.关键词
含锌HZSM-5催化剂/酸强度和类型/活化能Key words
Zn-containing HZSM-5 catalysts/acid strength and types/activation energy分类
化学化工引用本文复制引用
李柏超,邵嘉蓓,冯鹏程,王建国,樊卫斌,董梅..反应温度对Zn改性HZSM-5分子筛催化乙烯芳构化性能的影响[J].燃料化学学报（中英文）,2025,53(9):1354-1363,10.基金项目
The project was supported by National Key R&D Program of China(2020YFA0210902)and National Natural Science Foundation of China(22372189,22322208).国家重点研发计划(2020YFA0210902)和国家自然科学基金(22372189,22322208)资助 （2020YFA0210902）
