蒸汽辅助低成本合成多级孔ZSM-5分子筛及其催化裂解性能

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关键词：六亚甲基亚胺；ZSM-5分子筛；催化裂解；苯系物；低密度聚乙烯 中图分类号：TQ426.94 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.01.011

Steam assisted synthesis of hierarchical ZSM-5 zeolites with hexamethyleneimine as template and catalytic crackingperformance

GE Hucheng，GU Yufei，HUANG Xue，LIU Feifei，HUANG Yanmei，LI Fuwei，LI Zhixi： （School of Chemistry and Chemical Engineering，Guangxi University，Nanning 53OoO4，China）

Abstract：ZSM-5 zeolites have problemsof high synthesiscost and small porecaused diffusional limitations.Hexamethylenimine（HMI）and polyethylene-polypropylene glycol （F68）were used as the micropore and mesopore templates respectively to synthesize hierarchical ZSM-5 zeolite（SFZ）via a steam-assisted method.Effects of NaOH， F68addition amounts，and crystallzation timeonthe crystallnityof synthesized zeolite was investigated.The physicochemical properties of the zeolites were characterized by X-raydifraction（XRD），scanning electron microscopy（SEM）， N2 adsorption-desorption，and ammonia temperature-programmed desorption （ NH3 -TPD）. The performance of the catalyst was evaluated by catalytic cracking of low density polyethylene（LDPE）.The results show that SFZ-15%（F68/HMI mass ratio =15% ）achieves the highest liquid yield（ 21.42% ）and BTEX（benzene，toluene，ethylbenzene，xylene）selectivity（ 86.34% ）. Moreover， SFZ- 15% exhibits excellent coke resistance and catalytic stability.

Key words：hexamethyleneimine； ZSM-5 zeolites； catalytic cracking；BTEX； LDPE

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