低碳烯烃异构化/芳构化反应机理研究进展

Studies on the reaction mechanism of light olefin isomerization and aromatization

简述了分子筛催化剂上低碳烯烃异构化的单分子机理、双分子机理、假单分子机理及环状过渡态机理,指出单分子机理和双分子机理更为大多数研究者所接受,在低碳烯烃的异构化过程中单分子机理和双分子机理同时存在,单分子机理是烯烃异构化的主要途径,而双分子机理主要生成副产物。介绍了分子筛催化剂上低碳烯烃芳构化反应机理的研究进展,指出低碳烯烃的芳构化是一个混合聚合的过程。另外,介绍了低碳烯烃在金属改性的分子筛催化剂上的芳构化机理研究进展,指出金属的引入导致了新的反应路径,能有效提高烯烃的转化率和芳烃的选择性。

The monomolecular mechanism,bimolecular mechanism,pseudounimolecular mechanism and cyclo-transition state mechanism for olefin isomerization over the zeolite catalysts were reviewed.The monomolecular mechanism and bimolecular mechanism have been accepted by more researchers.Olefins were considered to be isomerized mainly through monomolecular mechanism and by-products are generated through bimolecular mechanism. Light olefin aromatization is a conjunct polymerization process over zeolite catalysts. The advances of olefin aromatization over metal modified zeolite catalysts were also discussed. The introduction of metal led to a new reaction path, raising the conversion of olefins and the selectivity of aromatics in light olefin aromatization.