乙苯侧链选择性加氢脱端甲基催化剂制备与性能研究

石油炼制与化工 ›› 2025, Vol. 56 ›› Issue (8): 42-47.

乙苯侧链选择性加氢脱端甲基催化剂制备与性能研究

顾士庆,石张平,李经球,孔德金

中石化（上海）石油化工研究院有限公司，绿色化工与工业催化国家重点实验室

收稿日期:2025-03-04 修回日期:2025-04-15 出版日期:2025-08-12 发布日期:2025-07-28
通讯作者: 顾士庆 E-mail:gusq.sshy@sinopec.com

CATALYST PREPARATION AND PERFORMANCE STUDY FOR SELECTIVE TERMINAL METHYL REMOVAL VIA HYDROGENATION OF ETHYLBENZENE

Received:2025-03-04 Revised:2025-04-15 Online:2025-08-12 Published:2025-07-28

摘要/Abstract

摘要： 采用载体金属改性的方法制备了芳烃侧链烷基脱端甲基催化剂，研究了不同催化剂体系的乙苯加氢脱烷基反应行为，通过反应行为比对确定了催化剂体系载体为氧化铝，负载活性金属为Rh。在此基础上，探索了氧化铝载体改性和活性金属负载量对催化剂的影响，通过氨气程序升温脱附（NH₃-TPD）和吡啶吸附红外（Py-FTIR）等手段对其进行了表征。结果表明，改性助剂K₂O可有效抑制Al₂O₃载体表面酸性，提高芳烃C₂+侧链脱端甲基反应选择性。在所制备的K- Al₂O₃催化剂中，Rh负载量（w）0.7%的催化剂具有最高的乙苯转化率和端甲基脱除选择性，乙苯转化率高达60%，产物中甲苯与苯的摩尔比上升至5.9。同时考察了反应压力、反应温度和氢烃摩尔比等工艺条件对催化剂性能的影响规律。

关键词: 乙苯, 脱烷基, 加氢, 端甲基, 芳烃, 酸性调控

Abstract: The catalysts for selective terminal methyl removal via hydrogenation of aromatics were synthesized by modifying the carrier metal. The hydrodealkylation behavior of ethylbenzene over different catalyst systems was systematically investigated, and the optimal catalyst system was identified as Rh supported on an alumina (Al₂O₃) carrier through comparative analysis of reaction performance. Subsequently, the effects of Al2O3 support modification and active metal loading on catalytic performance were explored. The prepared catalysts were characterized using ammonia temperature-programmed desorption (NH₃-TPD) and pyridine infrared spectroscopy (Py-FTIR). The results revealed that the introduction of K₂O as a modifier effectively suppressed the surface acidity of the Al₂O₃ carrier, thereby enhancing the selectivity for terminal methyl removal from C₂+ side chains in aromatics molecule. Among the synthesized K-modified Al₂O₃ catalysts, the 0.7% Rh-loaded catalyst exhibited the highest ethylbenzene conversion (60%) and optimal methyl removal selectivity. Notably, the molar ratio of toluene to benzene in the products increased to 5.9 under optimized conditions.Additionally, the effects of reaction pressure, temperature and hydrocarbon ratio conditions on catalytic performance were systematically investigated.

Key words: ethylbenzene, dealkalation, hydrogenation, terminal methyl, aromatics, acidity control

顾士庆石张平李经球孔德金. 乙苯侧链选择性加氢脱端甲基催化剂制备与性能研究[J]. 石油炼制与化工, 2025, 56(8): 42-47.

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