以柠檬酸和乙二酸四乙酸二钠（EDTA-2Na）为复合改性剂，通过后处理法制备出具有多级孔结构的Y分子筛。在保证分子筛结晶度的同时，柠檬酸和EDTA-2Na可有效脱除骨架铝和六配位非骨架铝物种。改性后Y分子筛的骨架硅铝摩尔比[n（SiO₂）/n（Al₂O₃）]提高1倍，结晶度仅降低1.3%；分子筛的比表面积得到有效提高，介孔含量明显增加，并且连通性更好。以其作为酸性组分制备的加氢裂化催化剂，馏分油总收率比商业USY分子筛提高6.5%。

A series of hierarchical Y-type zeolites are prepared by a post-treatment method through using citric acid and disodium ethylenediaminetetraacetate dihydrate (EDTA-2Na) as compound modifying agent.Framework Al and hexacoordinated non-framework aluminum in the zeolite can be effectively removed by citric acid and EDTA-2Na,while the crystallinity of Y-type zeolite can be well maintained.As a result,the Si/Al molar ratio of modified Y-type zeolite is twice that of commercialized Y-type zeolite while the crystallinity only decreases by 1.3%.Both the specific surface area and mesopores volume increase obviously as well.Finally,the modified Y-type zeolite is used as an acid component to prepare the hydrocracking catalyst,over which the yield of distillate oil increases 6.5 percentage compared to that over commercialized Y-type zeolite.

魏麟骄(1990-),女,硕士研究生,助教,主要从事工业催化研究,ww278614188@163.com