2026-10-14T10:43:38Z https://www.scidb.cn/oai

10.57760/sciencedb.j00124.00122 2024-04-25T16:05:57Z

2024-04-25 The effect of hydrothermal pretreatment on the catalytic performance of Zn/HZSM-5 catalysts for ethylene aromatization reaction doi:10.57760/sciencedb.j00124.00122 en To address the issue of coking and deactivation of Zn/HZSM-5 catalyst 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 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 high-temperature hydrothermal pretreatment. Although the conversion of ethylene slightly decreased, the catalyst lifetime significantly increased from 72 h to 216 h, while maintaining an aromatic selectivity of over 60%. It was suggested that the hydrothermal treatment enhanced the interaction between ZnO species and B 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. 水热预处理; Zn/HZSM-5; 乙烯芳构化; Zn物种 邵嘉蓓 李柏超 董梅 樊卫斌 秦张峰 王建国 PUBLIC https://creativecommons.org/publicdomain/zero/1.0/ dataset http://www.doi.org/10.1016/s1872-5813(24)60448-2 Science Data Bank