碳六烃类在HY沸石上的吸附及结炭过程研究 Ⅱ.结炭过程中烃结构的变化  

ADSORPTION AND COKE FORMATION OF C_6 HYDROCARBONS ON HY ZEOLITE Ⅱ. THE CHANGE OF HYDROCARBON STRUCTURE IN COKE FORMATION

作　　者：栾兆华[1] 张盈珍[1] 李栋藩[1] 王力遐 郑禄彬[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023

出　　处：《Chinese Journal of Catalysis》1992年第2期127-132,共6页催化学报（英文）

基　　金：国家自然科学基金

摘　　要：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。The structure change during the coke formation of iso-hexane, 1-hexene, cyclohexene and benzene has been studied by IR spectroscopic technique. No coke formation of iso-hexane and benzene is observed at the temperature lower than 400℃, while coke can be formed from 1-hexene and cyclohexene at the temperature higher than 100℃. After the adsorption of cyclohexene at room temperature, a new band around 1523 cm-1 appears,which perhaps indicates the formation of cycloolefinic car-bocation. When the temperature is higher than 100℃, the structure of hydrocarbon adsorbed changes continuously to low-ring aromatics, on further heating, there occur disproportionation, cyclization, isomerization etc., and finally a coke band around 1585cm-1 appears. The coke is a polycyclic aromatic structure linked with many branched chains with tertiary carbon atom.

关 键 词：碳六烃 结构 吸附 HY沸石 结炭 

分 类 号：TQ426.7[化学工程]