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应用红外光谱技术研究了异己烷、己烯-1、环己烯、苯等不同结构碳六烃在HY沸石表面结炭过程中的结构变化过程。发现在实验温度范围内(≤400℃),观察不到烷烃和苯的结炭,己烯-1、环乙烯在100—150℃即可结炭。环己烯于室温吸附后,在1523cm~(-1)处产生一新的吸收谱带,可能是形成了环烯正碳离子。反应温度高于100℃时,吸附烃结构进一步发生变化形成低环芳烃,随温度升高,进而发生歧化、环化、加成、异构化等反应,最终形成带有多侧链的多环芳烃结构的焦炭物质。己烯-1与环己烯具有类似的结炭历程。
Infrared spectroscopy was used to study the structural change of carbon hexalchenes with different structures such as isohexane, hexene-1, cyclohexene and benzene on the surface of HY zeolite. It was found that in the experimental temperature range (≤400 ℃), no condensation of alkanes with benzene could be observed. Hexene-1 and cyclohexene were carbonized at 100-150 ℃. After adsorption of cyclohexene at room temperature, a new absorption band at 1523cm ~ (-1) was formed, which may be due to the formation of cyclocarbons. When the reaction temperature is higher than 100 ℃, the structure of adsorbed hydrocarbons further changes to form low-cyclic aromatics. With the increase of temperature, disproportionation, cyclization, addition, isomerization and other reactions will occur, eventually forming polycyclic rings with multiple side chains Aromatic structure of the coke material. Hexene-1 has a similar carbonation history to cyclohexene.