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采用原位红外光谱技术 ,于 1 2 0～ 2 0 0℃下 ,对沸石催化剂上苯与乙烯烷基化的反应机理进行了探讨 .结果表明 ,乙烯、苯和乙苯吸附在催化剂的同一类活性中心上 ,它们之间存在着竞争吸附 ,乙烯的吸附能力较苯和乙苯强 ;吸附的乙烯可与吸附的苯或乙苯发生烷基化反应 .催化剂上已吸附乙烯时 ,由于乙烯在强吸附位上吸附较牢 ,苯和乙苯不易吸附 ,烷基化反应难以进行 ,且吸附的乙烯间可发生反应 .乙烯与乙苯的反应较丙烯与异丙苯的反应难于进行 .
The reaction mechanism of benzene and ethylene alkylation on zeolite was investigated by in-situ infrared spectroscopy at 120 ~ 200 ℃. The results showed that ethylene, benzene and ethylbenzene adsorbed on the same kind of catalyst Active center, there is competitive adsorption between them, the adsorption capacity of ethylene is stronger than that of benzene and ethylbenzene; the adsorbed ethylene can be alkylated with adsorbed benzene or ethylbenzene. When ethylene has been adsorbed on the catalyst, Adsorption of strong adsorption sites more firmly, benzene and ethylbenzene adsorption is not easy, alkylation reaction is difficult, and the reaction of ethylene can occur between ethylene and ethylbenzene reaction than propylene and cumene reaction difficult.