Y型分子筛应用于双环芳烃加氢裂化多产轻芳烃过程研究进展

Advances on the application of zeolite Y in the producing light aromatic hydrocarbons from dicyclic aromatics hydrocracking

催化柴油富含双环芳烃,可通过加氢裂化过程选择性多产高价值轻质芳烃(BTX)产物,现有研究已对此过程所需的工艺条件和催化剂性质进行了大量考察。工业应用中催化剂的酸性组分以Y型分子筛为主,研究分子筛性质和反应结果的关系成为重点内容。本文主要介绍了双环芳烃多产BTX产物经历加氢饱和、开环、断侧链等主要反应过程,金属组分及其与分子筛的协同作用;总结了Y型分子筛的性质如孔道性质、小晶粒、酸性质、核壳结构等因素对上述反应过程的影响。初步表明分子筛孔性质、酸性质直接影响目标反应选择性,通过对分子筛性质进行调变,可以达到促进反应物有效转化及提高BTX产物收率的目的。

The bicyclic aromatics are abundant in light cycle oils and can be selectively converted into high-value light aromatics(BTX)through hydrocracking.The existing researches have investigated the process conditions and catalyst properties.Y zeolites are widely used as the acidic component in industrial catalysts,it is very important to study the relationship between the properties of zeolites and reaction results.This article focuses on the advances of those reaction paths on producing of BTX by bicyclic aromatic hydrocarbons undergoing hydrotreating saturation,ring-opening,and side chain breaking,the synergistic effect between metal components and zeolite is also summarized.The effects of the properties of zeolite Y,such as texture properties,small crystal particle,acid properties,and coated structure were summarized.These results preliminary showed that the properties of pore and acidity from Y zeolite are important factors to improve the selectivity of the target reaction.By adjusting the properties of Y zeolite,the objectives of promoting conversion and increasing the yield of BTX products can be achieved.