文献类型：期刊文献

中文题名：短b-轴多级孔ZSM-5无Na^(+)合成及催化正庚烷裂解性能

英文题名：Synthesis of Hierarchical ZSM-5 With Reduced b-Axis in Na^(+)-Free System and Its Catalytic Performance on n-Heptane Cracking

作者：钟少聪[1];赵德明[2];史会兵[2];姜海英[2];王龙[2];刘纪昌[1,3];朱卡克[1]

机构：[1]华东理工大学化工学院,上海200237;[2]山东京博石油化工有限公司,山东滨州256500;[3]石河子大学新疆兵团化工绿色重点实验室,新疆石河子832003

年份：2025

卷号：41

期号：1

起止页码：30

中文期刊名：石油学报(石油加工)

外文期刊名：Acta Petrolei Sinica(Petroleum Processing Section)

收录：;EI(收录号：20250317714191);北大核心:【北大核心2023】；

基金：山东京博石油化工有限公司项目(A300-82105)基金资助。

语种：中文

中文关键词：ZSM-5;短b-轴;无Na^(+)体系;轻烯烃;催化裂解

外文关键词：ZSM-5;reduced b-axis;Na^(+)-free system;light olefin;catalytic cracking

摘要：ZSM-5分子筛存在各向异性扩散传质,缩短b-轴长度和构筑多级孔是提升扩散性能的有效途径。发展了将共模板(四丙基氢氧化铵和四丁基氢氧化铵)与致孔剂(聚二烯丙基二甲基氯化铵)相结合的制备方法,在无Na^(+)体系中一步合成了短b-轴多级孔道ZSM-5分子筛。结合分子筛结构表征分析,探讨了短b-轴多级孔道ZSM-5分子筛制备过程中,铝源、致孔剂含量和硅/铝摩尔比对其形貌和结构的影响。经过P、La改性后,以正庚烷作为探针分子对其催化裂解性能进行评价。结果表明,短b-轴多级结构可以促进Haag-Dessau机理裂解反应,抑制双分子裂解和氢转移副反应。因此,短b-轴多级孔道ZSM-5分子筛显示出更高的催化活性、轻烯烃收率和选择性,以及更低的芳烃选择性。
Anisotropic diffusion mass transfer occurs in ZSM-5 zeolites,for which it is an effective way to improve the diffusion ability by reducing the length of b-axis and constructing a hierarchical porous structure.In this work,a new method for the one-step synthesis of the hierarchical ZSM-5 zeolites with reduced b-axis in Na^(+)-free system is developed by combining co-template(terapropylammonium hydroxide and terabutylammonium hydroxide)and porogen(diallyldimethylammonium chloride).Combined with zeolite structure characterization and analysis,the effects of Al source,porogen content and Si/Al molar ratio on the morphology and structure of the hierarchical ZSM-5 zeolite with reduced b-axis during its preparation process are explored.For the P-and La-modified ZSM-5 zeolite,n-heptane is used as probe molecule to evaluate its catalytic cracking performance.The results demonstrate that the reduced b-axis and hierarchical porous structure can promote the cracking reaction of Haag-Dessau mechanism,and inhibit the side reactions such as bimolecular reaction of cracking and hydrogen transfer.Therefore,the hierarchical ZSM-5 zeolite exhibit higher catalytic activity,light olefin yield and selectivity,as well as lower aromatics selectivity.