Hierarchical Fe-MFI were synthesized by post-treatment with TPAOH and applied as catalysts in liquid phase dehydration of 1-phenylethanol. The catalysts were characterized by XRD, TEM and N2 physisorption et al. After treatment, more ferric ions occupied zeolite framework sites, leading to increase in Brønsted acid sites content. Moreover, secondary pores with pore size range in 8–100 nm were introduced into inside zeolite. The secondary pores improved the accessibility of active centers and diffusion properties of reactants. The conversion of 1-phenylethanol reached 90% with 99% styrene selectivity in 1.5 h at 80 °C, while the reaction time of hierarchical Fe-MFI is only a half of microporous Fe-MFI zeolite. Moreover, the hierarchical Fe-MFI could be reused for at least five times.

中文翻译：

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分级沸石 Fe-MFI 作为活性增强催化剂用于 1-苯乙醇的选择性液相脱水

通过用TPAOH后处理合成多级Fe-MFI，并用作1-苯基乙醇液相脱水的催化剂。通过 XRD、TEM 和 N2 物理吸附等对催化剂进行表征。处理后，更多的铁离子占据沸石骨架位点，导致布朗斯台德酸位点含量增加。此外，孔径范围在 8-100 nm 的次生孔被引入到沸石内部。二级孔改善了活性中心的可达性和反应物的扩散性能。1-苯基乙醇的转化率在 80°C 下 1.5 小时内达到 90%，苯乙烯选择性为 99%，而分级 Fe-MFI 的反应时间仅为微孔 Fe-MFI 沸石的一半。此外，分层 Fe-MFI 可以重复使用至少五次。