燃料化学学报（中英文）2024，Vol.52Issue(8)：1079-1087,9.DOI:10.1016/S1872-5813(24)60448-2
水热预处理Zn/HZSM-5催化剂对其催化乙烯芳构化反应性能的影响
The effect of hydrothermal pretreatment on the catalytic performance of Zn/HZSM-5 catalysts for ethylene aromatization reaction
摘要
Abstract
To address the issue of coking and deactivation of Zn/HZSM-5 catalysts used for light olefins aromatization,a high-temperature hydrothermal method was employed for catalyst pretreatment.The catalysts were characterized using XRD,N2 physical adsorption-desorption,NH3-TPD,Py-FTIR,XPS and TG techniques.The effect of high-temperature hydrothermal pretreatment on the catalytic performance and stability of the catalyst was investigated using ethylene aromatization as a probe reaction.The results showed that the Zn/HZSM-5 catalyst exhibited excellent catalytic performance after 48 h of high-temperature hydrothermal pretreatment.Although the conversion of ethylene slightly decreased,the catalyst lifetime was significantly extended,increasing from 72 to 216 h,while the aromatics selectivity remained above 60%.It was suggested that the hydrothermal treatment enhanced the interaction between ZnO species and Brønsted acid sites,promoting the generation of ZnOH+species.This not only suppressed the hydrogen transfer reaction but also significantly enhanced the dehydrogenation performance of the catalyst,improving the selectivity towards hydrogen.Additionally,the catalyst exhibited increased carbon capacity and reduced carbon deposition rate after hydrothermal treatment,demonstrating excellent anti-coking properties.关键词
Zn/HZSM-5/水热预处理/乙烯芳构化/Zn物种Key words
Zn/HZSM-5/hydrothermal pretreatment/ethylene aromatization/Zn species分类
化学化工引用本文复制引用
邵嘉蓓,李柏超,董梅,樊卫斌,秦张峰,王建国..水热预处理Zn/HZSM-5催化剂对其催化乙烯芳构化反应性能的影响[J].燃料化学学报（中英文）,2024,52(8):1079-1087,9.基金项目
The project was supported by National Key R&D Program of China(2020YFB0606402),National Natural Science Foundation of China(22372189,22322208,U1910203).国家重点研发计划(2020YFB0606402)和国家自然科学基金(22372189,22322208,U1910203)资助 （2020YFB0606402）
