锌离子改性缺陷型ZSM-5沸石的研究  

Study on Zinc Modification of Defective ZSM-5 Zeolites

作　　者：林龙 王吉垒[2] 周琳 何慧[1] LIN Long;WANG Ji-lei;ZHOU Lin;HE Hui(College of Materials Science and Engineering,South China University of Technology,Guangzhou Guangdong 510641,China;Sinopec Maoming PetrochemicaL Branch Company,Maoming Guangdong 525011,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641 [2]中国石油化工股份有限公司茂名分公司,广东茂名525011

出　　处：《当代化工》2023年第2期253-256,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金,木质素碳基吸波材料设计合成与强化损耗机制研究(项目编号:22178037)。

摘　　要：利用多种不同表征及评价手段对比研究了锌改性的缺陷型ZSM-5沸石和缺陷程度较小的常规ZSM-5沸石在锌离子物种、表面酸性和丙烷催化转化性能的区别。研究结果表明:不同于常规ZSM-5沸石,落位于缺陷型HZSM-5沸石羟基窝的锌离子物种主要以亚纳米氧化锌团簇形式存在,这种亚纳米氧化锌团簇在丙烷转化反应中表现出更好的丙烷脱氢反应选择性。此外,锌离子改性的缺陷型HZSM-5沸石由于保留较多的Brønsted酸中心,因而在丙烷转化反应中生成较多的芳烃产物。The differences between zinc modified defective ZSM-5 zeolites and conventional ZSM-5 zeolites with smaller defects in zinc ion species and propane catalytic conversion performance were studied.The results showed that,unlike conventional ZSM-5 zeolites,the zinc ion species located in the hydroxyl nest of defective HZSM-5 zeolite mainly existed in the form of ZnO clusters.The ZnO clusters showed better selectivity for propane dehydrogenation in propane conversion reaction.In addition,the zinc-modified defective HZSM-5 zeolites had more Brønsted acid sites,resulting in the formation of more aromatic products in propane conversion reaction.

关 键 词：ZSM-5分子筛 骨架缺陷 羟基窝 锌改性 催化作用 

分 类 号：O643.36[理学—物理化学]