稀乙烯在ZSM－5沸石上转化为异丁烯与汽油的反应

REACTIONS OF DILUTE ETHYLENE CONVERTING TO ISOBUTYLENE AND GASOLINE OVER ZSM-5

考察了稀乙烯在ＺＳＭ－５佛石上的转化反应，提出了以汽油或异丁烯为目的产物时的反应参数；同时对乙烯在ＺＳＭ－５沸石上叠合、芳构化反应的机理进行了探讨。结果表明：反应温度为３００℃时，以异丁烯为主的Ｃ４烯烃选择性最大；反应温度为３５０℃时，汽油产率最大。在芳构化过程中既有氢转移反应，又有直接脱氢生成芳烃的反应。

Reactions of dilute ethylene converting to isobutylene and gasoline over ZSM-5 zeolitewere investigated. Aiming at the selectivity of isobutylene and/or gasoline product, the reaction parameters were chosen. The mechanism of ethylene polymerization and aromatization over ZSM-5 was proposed.The maximum isobutylene selectivity and the highest gasoline yield appeared at a reaction temperature of300℃ and 350C respectively. Hydrogen transfer reaction was present in the course of aromatization, anddehydrogenation reaction as well.