Abstract:

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.

Key words: Hβ zeolite, Thiophene, In?situ infrared spectroscopy, Alkylation reaction, Non?framework aluminium

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。

关键词: Hβ分子筛, 噻吩, 原位红外, 烷基化反应, 非骨架铝