基于原位红外光谱法的β分子筛上噻吩烷基化反应机理探究  

Study on Mechanism of Thiophene Alkylation Reaction on Hβ Zeolites by In-Situ Infrared Spectroscopy

作　　者：孙祥博 惠宇 张景威 李志颖 秦玉才 宋丽娟[1] Sun Xiangbo;Hui Yu;Zhang Jingwei;Li Zhiying;Qin Yucai;Song Lijuan(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《辽宁石油化工大学学报》2023年第4期66-71,共6页Journal of Liaoning Petrochemical University

基　　金：国家自然科学基金项目(21902068);中国石油科技创新基金项目(2020D-5007-0401);中国石油天然气股份有限公司科技专项外协项目(KYWX-21-019)。

摘　　要：运用原位红外光谱技术系统探究了噻吩与1-己烯在Hβ分子筛上的吸附、竞争吸附和烷基化转化行为,讨论了不同酸性位在噻吩及烯烃分子发生烷基化反应过程中所扮演的角色。结果表明,1-己烯分子优先在B酸位上吸附,并容易发生质子化和二聚反应,因此与噻吩分子的吸附及质子化反应过程存在显著的竞争关系;在Hβ分子筛非骨架铝物种上吸附的噻吩分子更易于与邻近B酸中心上质子化的1-己烯分子发生烷基化反应。研究结果可为烷基化脱硫分子筛催化剂的开发提供基础理论数据支撑。The adsorption competitive adsorption and conversion behaviors of thiophene and 1-hexene on Hβ molecular sieve have been studied by using the method of in-situ infrared spectroscopyThe roles of different acidic sites in the alkylation reaction of thiophene and olefin molecule were systematically discussed.The results show that 1-hexene is preferentially adsorbed on the B acid sites,and it s easy to dimerize through protonation activation.Thus,there is a significant competitive relationship between the adsorption of thiophene molecules and the protonation reaction process.Moreover,it can be confirmed that the adsorbed thiophene molecule on non-framework aluminum on zeolite are more likely to its alkylation with a protonation 1-hexene molecule near the center of the B acidThis results can provide basic theoretical guidance for the development of zeolite catalysts for alkylation desulfurization processes.

关 键 词：HΒ分子筛 噻吩 原位红外 烷基化反应 非骨架铝 

分 类 号：TE624.4[石油与天然气工程—油气加工工程] TQ028.8[化学工程]