液晶模板合成多级孔ZSM-5分子筛及其催化应用  

Synthesis of Hierarchical ZSM-5 Zeolite with Liquid-Crystal Template and Its Catalytic Activity

作　　者：张玲[1] ZHANG Ling(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《分子催化》2021年第4期319-327,I0001,共10页Journal of Molecular Catalysis(China)

基　　金：辽宁石油化工大学博士基金资助项目(5968)。

摘　　要：以哌嗪基丙基甲基二甲氧基硅烷偶联剂(PZPMS)和阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为复合液晶模板,在水热条件下合成多级孔ZSM-5分子筛.采用XRD、 SEM、 BET、 XRF、 FT-IR和NH3-TPD对催化剂的性能进行了表征.结果表明, PZPMS/CTAB复合液晶模板的加入可以减小颗粒尺寸,增加外表面积,有利于合成多级孔ZSM-5分子筛.加入液晶模板可以有效调整催化剂表面B酸与L酸量比例,改善催化剂表面酸性.对合成的催化剂样品在MTA反应中进行了催化性能测试,样品在反应中对芳烃表现出较高的选择性,催化寿命有不同程度的提高.Using piperazinyl propyl methyl dimethoxy silane coupling agent(PZPMS) and cationic surfactant cetyl trimethyl ammonium bromide(CTAB) as composite liquid-crystalline template, under hydrothermal conditions porous ZSM-5 molecular sieve was synthesized. The performance of the catalysts were characterized by XRD, SEM, BET, XRF, FT-IR and NH3-TPD. The result shows that the addition of the PZPMS/CTAB can reduce the particle size and increase the external surface area, which is beneficial to the synthesis of porous ZSM-5 molecular sieves. The liquidcrystalline template can effectively adjust the ratio of B acid to L acid on the catalyst surface and improve the acidity of the catalyst surface. The performance of the synthesized catalysts were tested in the MTA reaction. The catalysts showed higher selectivity to aromatics and the catalytic life was improved to varying degrees in the reaction.

关 键 词：ZSM-5 PZPMS 多级孔 MTA 液晶模板 

分 类 号：O647[理学—物理化学]