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  

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

作　　者：葛虎城 顾宇飞 黄雪 刘菲菲 黄艳梅[1] 李福威 李志霞[1] GE Hucheng;GU Yufei;HUANG Xue;LIU Feifei;HUANG Yanmei;LI Fuwei;LI Zhixia(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《高校化学工程学报》2025年第1期95-104,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(22078076);广西自然科学基金(2020GXNSFAA159174)。

摘　　要：针对ZSM-5分子筛合成成本高、微孔结构易引起扩散限制的问题,文中以六亚甲基亚胺(HMI)为主模板剂,聚氧乙烯聚氧丙烯醚(F68)为介孔模板剂,采用蒸汽辅助晶化法合成多级孔ZSM-5分子筛(SFZ),探究NaOH添加量、晶化时间以及F68添加量对分子筛结晶度的影响。此外,采用X射线衍射(XRD)、扫描电镜(SEM)、N_(2)吸附-脱附及氨程序升温脱附(NH_(3)-TPD)等手段对催化剂的物理化学性能进行了表征,对低密度聚乙烯(LDPE)进行了催化裂解,并且评价了分子筛的催化性能。结果表明,SFZ-15(F68添加量为HMI质量的15%)获得了最高的液体产率(21.42%)和苯系物(BTEX,如苯、甲苯、乙苯、二甲苯)选择性(86.34%),同时表现出优异的抗积碳能力和催化稳定性。ZSM-5 zeolites have problems of high synthesis cost and small pore caused 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,F68 addition amounts,and crystallization time on the crystallinity of synthesized zeolite was investigated.The physicochemical properties of the zeolites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N_(2) adsorption-desorption,and ammonia temperature-programmed desorption(NH_(3)-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.

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 

分 类 号：TQ426.94[化学工程]