论文部分内容阅读
应用有效的红外光谱技术研究了1-己烯在HY沸石上的吸附和结炭过程。1-己烯室温吸附后,引起小笼羟基伸缩振动谱带增强;在3140cm~(-1)附近出现了大峰包;并且硅终端羟基和小笼羟基伸缩振动谱带向低频发生位移。这些现象可能是吸附质促使部分超笼羟基转向小笼或质子迁移、以及1-己烯的π电子云与各类羟基作用的结果。升温脱气后,上述现象迅速减弱。当温度高于100℃时,可观察到1-己烯的进一步表面反应,有低环芳烃和多环类表面产物形成。温度越高,表面生成的焦炭结构越趋于复杂化。反应过程中,吸附态烃和气相烃结构不断变化,观察到了支链烃和多环芳烃结构物质。
Adsorption and coking processes of 1-hexene on HY zeolite have been studied using an effective infrared spectroscopy technique. After 1-hexene was adsorbed at room temperature, the hydroxyl stretching vibration band of Xiaozhang was enhanced. At about 3140cm -1, a large peaked package appeared. The stretching vibration bands of terminal and hydroxyl groups of Si terminal shifted to low frequencies. These phenomena may be due to the adsorption mass to promote the transfer of some supercages to cages or protons, and 1-hexene π electron cloud with various hydroxyl groups. After the temperature degassing, the phenomenon weakened rapidly. Further surface reactions of 1-hexene can be observed at temperatures above 100 ° C with the formation of low-cyclic aromatics and polycyclic surface products. The higher the temperature, the more coherent the surface-generated coke structure becomes. During the reaction, the structure of adsorbed hydrocarbon and gas phase hydrocarbons changed continuously, branched-chain hydrocarbons and PAHs were observed.